Esempio: hasVariables e getVariables

Funzioni > Funzioni di utilità > Esempio: hasVariables e getVariables

Esempio: hasVariables e getVariables

Utilizzare la funzione hasVariables per controllare se in un'espressione vengono utilizzate variabili specifiche.

Estrarre le variabili da un'espressione utilizzando la funzione getVariables.

1. Definire un'espressione.

<region id="ID0E4LBFB" actualWidth="4913.1800000000012" actualHeight="76.933520434570312" top="115.20000000000002" left="19.200000000000003" xmlns="http://schemas.mathsoft.com/worksheet50">
  <math resultRef="5">
    <define xmlns="http://schemas.mathsoft.com/math50">
      <id xml:space="preserve" labels="VARIABLE">A</id>
      <apply>
        <div />
        <apply>
          <plus />
          <apply>
            <neg />
            <parens>
              <apply>
                <mult />
                <apply>
                  <pow />
                  <id xml:space="preserve" labels="CONSTANT">e</id>
                  <apply>
                    <div />
                    <apply>
                      <mult />
                      <apply>
                        <mult />
                        <parens>
                          <apply>
                            <plus />
                            <apply>
                              <mult />
                              <real>2</real>
                              <id xml:space="preserve" labels="VARIABLE">f</id>
                            </apply>
                            <apply>
                              <plus />
                              <apply>
                                <mult />
                                <id xml:space="preserve" labels="VARIABLE">
                                  <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                </id>
                                <id xml:space="preserve" labels="VARIABLE">α</id>
                              </apply>
                              <id xml:space="preserve" labels="VARIABLE">
                                <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                              </id>
                            </apply>
                          </apply>
                        </parens>
                        <id xml:space="preserve" labels="CONSTANT">π</id>
                      </apply>
                      <imag symbol="i">1</imag>
                    </apply>
                    <apply>
                      <mult />
                      <apply>
                        <mult />
                        <real>4</real>
                        <id xml:space="preserve" labels="VARIABLE">
                          <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                        </id>
                      </apply>
                      <id xml:space="preserve" labels="VARIABLE">α</id>
                    </apply>
                  </apply>
                </apply>
                <apply>
                  <id xml:space="preserve" labels="FUNCTION">Ei</id>
                  <sequence>
                    <real>1</real>
                    <apply>
                      <plus />
                      <apply>
                        <div />
                        <apply>
                          <mult />
                          <apply>
                            <mult />
                            <parens>
                              <apply>
                                <plus />
                                <apply>
                                  <mult />
                                  <real>2</real>
                                  <id xml:space="preserve" labels="VARIABLE">f</id>
                                </apply>
                                <apply>
                                  <plus />
                                  <apply>
                                    <mult />
                                    <id xml:space="preserve" labels="VARIABLE">
                                      <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                    </id>
                                    <id xml:space="preserve" labels="VARIABLE">α</id>
                                  </apply>
                                  <id xml:space="preserve" labels="VARIABLE">
                                    <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                  </id>
                                </apply>
                              </apply>
                            </parens>
                            <id xml:space="preserve" labels="CONSTANT">π</id>
                          </apply>
                          <imag symbol="i">1</imag>
                        </apply>
                        <apply>
                          <mult />
                          <apply>
                            <mult />
                            <real>4</real>
                            <id xml:space="preserve" labels="VARIABLE">
                              <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                            </id>
                          </apply>
                          <id xml:space="preserve" labels="VARIABLE">α</id>
                        </apply>
                      </apply>
                      <apply>
                        <mult />
                        <apply>
                          <mult />
                          <apply>
                            <mult />
                            <parens>
                              <apply>
                                <plus />
                                <apply>
                                  <mult />
                                  <real>2</real>
                                  <id xml:space="preserve" labels="VARIABLE">f</id>
                                </apply>
                                <apply>
                                  <plus />
                                  <apply>
                                    <mult />
                                    <id xml:space="preserve" labels="VARIABLE">
                                      <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                    </id>
                                    <id xml:space="preserve" labels="VARIABLE">α</id>
                                  </apply>
                                  <id xml:space="preserve" labels="VARIABLE">
                                    <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                  </id>
                                </apply>
                              </apply>
                            </parens>
                            <id xml:space="preserve" labels="VARIABLE">t</id>
                          </apply>
                          <id xml:space="preserve" labels="CONSTANT">π</id>
                        </apply>
                        <imag symbol="i">1</imag>
                      </apply>
                    </apply>
                  </sequence>
                </apply>
              </apply>
            </parens>
          </apply>
          <parens>
            <apply>
              <minus />
              <apply>
                <plus />
                <apply>
                  <mult />
                  <apply>
                    <mult />
                    <imag symbol="i">1</imag>
                    <apply>
                      <pow />
                      <id xml:space="preserve" labels="CONSTANT">e</id>
                      <apply>
                        <div />
                        <apply>
                          <mult />
                          <apply>
                            <mult />
                            <parens>
                              <apply>
                                <plus />
                                <apply>
                                  <mult />
                                  <real>2</real>
                                  <id xml:space="preserve" labels="VARIABLE">f</id>
                                </apply>
                                <parens>
                                  <apply>
                                    <minus />
                                    <id xml:space="preserve" labels="VARIABLE">
                                      <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                    </id>
                                    <apply>
                                      <mult />
                                      <id xml:space="preserve" labels="VARIABLE">
                                        <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                      </id>
                                      <id xml:space="preserve" labels="VARIABLE">α</id>
                                    </apply>
                                  </apply>
                                </parens>
                              </apply>
                            </parens>
                            <id xml:space="preserve" labels="CONSTANT">π</id>
                          </apply>
                          <imag symbol="i">1</imag>
                        </apply>
                        <apply>
                          <mult />
                          <apply>
                            <mult />
                            <real>4</real>
                            <id xml:space="preserve" labels="VARIABLE">
                              <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                            </id>
                          </apply>
                          <id xml:space="preserve" labels="VARIABLE">α</id>
                        </apply>
                      </apply>
                    </apply>
                  </apply>
                  <apply>
                    <id xml:space="preserve" labels="FUNCTION">Ei</id>
                    <sequence>
                      <real>1</real>
                      <apply>
                        <plus />
                        <apply>
                          <div />
                          <apply>
                            <mult />
                            <apply>
                              <mult />
                              <parens>
                                <apply>
                                  <plus />
                                  <apply>
                                    <mult />
                                    <real>2</real>
                                    <id xml:space="preserve" labels="VARIABLE">f</id>
                                  </apply>
                                  <parens>
                                    <apply>
                                      <minus />
                                      <id xml:space="preserve" labels="VARIABLE">
                                        <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                      </id>
                                      <apply>
                                        <mult />
                                        <id xml:space="preserve" labels="VARIABLE">
                                          <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                        </id>
                                        <id xml:space="preserve" labels="VARIABLE">α</id>
                                      </apply>
                                    </apply>
                                  </parens>
                                </apply>
                              </parens>
                              <id xml:space="preserve" labels="CONSTANT">π</id>
                            </apply>
                            <imag symbol="i">1</imag>
                          </apply>
                          <apply>
                            <mult />
                            <apply>
                              <mult />
                              <real>4</real>
                              <id xml:space="preserve" labels="VARIABLE">
                                <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                              </id>
                            </apply>
                            <id xml:space="preserve" labels="VARIABLE">α</id>
                          </apply>
                        </apply>
                        <apply>
                          <mult />
                          <apply>
                            <mult />
                            <apply>
                              <mult />
                              <parens>
                                <apply>
                                  <plus />
                                  <apply>
                                    <mult />
                                    <real>2</real>
                                    <id xml:space="preserve" labels="VARIABLE">f</id>
                                  </apply>
                                  <parens>
                                    <apply>
                                      <minus />
                                      <id xml:space="preserve" labels="VARIABLE">
                                        <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                      </id>
                                      <apply>
                                        <mult />
                                        <id xml:space="preserve" labels="VARIABLE">
                                          <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                        </id>
                                        <id xml:space="preserve" labels="VARIABLE">α</id>
                                      </apply>
                                    </apply>
                                  </parens>
                                </apply>
                              </parens>
                              <id xml:space="preserve" labels="VARIABLE">t</id>
                            </apply>
                            <id xml:space="preserve" labels="CONSTANT">π</id>
                          </apply>
                          <imag symbol="i">1</imag>
                        </apply>
                      </apply>
                    </sequence>
                  </apply>
                </apply>
                <parens>
                  <apply>
                    <minus />
                    <apply>
                      <plus />
                      <apply>
                        <mult />
                        <apply>
                          <pow />
                          <id xml:space="preserve" labels="CONSTANT">e</id>
                          <apply>
                            <div />
                            <apply>
                              <mult />
                              <apply>
                                <mult />
                                <parens>
                                  <apply>
                                    <plus />
                                    <apply>
                                      <neg />
                                      <parens>
                                        <apply>
                                          <mult />
                                          <real>2</real>
                                          <id xml:space="preserve" labels="VARIABLE">f</id>
                                        </apply>
                                      </parens>
                                    </apply>
                                    <apply>
                                      <plus />
                                      <apply>
                                        <mult />
                                        <id xml:space="preserve" labels="VARIABLE">
                                          <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                        </id>
                                        <id xml:space="preserve" labels="VARIABLE">α</id>
                                      </apply>
                                      <id xml:space="preserve" labels="VARIABLE">
                                        <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                      </id>
                                    </apply>
                                  </apply>
                                </parens>
                                <id xml:space="preserve" labels="CONSTANT">π</id>
                              </apply>
                              <imag symbol="i">1</imag>
                            </apply>
                            <apply>
                              <mult />
                              <apply>
                                <mult />
                                <real>4</real>
                                <id xml:space="preserve" labels="VARIABLE">
                                  <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                </id>
                              </apply>
                              <id xml:space="preserve" labels="VARIABLE">α</id>
                            </apply>
                          </apply>
                        </apply>
                        <apply>
                          <id xml:space="preserve" labels="FUNCTION">Ei</id>
                          <sequence>
                            <real>1</real>
                            <apply>
                              <plus />
                              <apply>
                                <neg />
                                <apply>
                                  <div />
                                  <apply>
                                    <mult />
                                    <apply>
                                      <mult />
                                      <parens>
                                        <apply>
                                          <minus />
                                          <apply>
                                            <mult />
                                            <real>2</real>
                                            <id xml:space="preserve" labels="VARIABLE">f</id>
                                          </apply>
                                          <parens>
                                            <apply>
                                              <plus />
                                              <apply>
                                                <mult />
                                                <id xml:space="preserve" labels="VARIABLE">
                                                  <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                                </id>
                                                <id xml:space="preserve" labels="VARIABLE">α</id>
                                              </apply>
                                              <id xml:space="preserve" labels="VARIABLE">
                                                <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                              </id>
                                            </apply>
                                          </parens>
                                        </apply>
                                      </parens>
                                      <id xml:space="preserve" labels="CONSTANT">π</id>
                                    </apply>
                                    <imag symbol="i">1</imag>
                                  </apply>
                                  <apply>
                                    <mult />
                                    <apply>
                                      <mult />
                                      <real>4</real>
                                      <id xml:space="preserve" labels="VARIABLE">
                                        <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                      </id>
                                    </apply>
                                    <id xml:space="preserve" labels="VARIABLE">α</id>
                                  </apply>
                                </apply>
                              </apply>
                              <apply>
                                <mult />
                                <apply>
                                  <mult />
                                  <apply>
                                    <mult />
                                    <parens>
                                      <apply>
                                        <minus />
                                        <apply>
                                          <mult />
                                          <real>2</real>
                                          <id xml:space="preserve" labels="VARIABLE">f</id>
                                        </apply>
                                        <parens>
                                          <apply>
                                            <plus />
                                            <apply>
                                              <mult />
                                              <id xml:space="preserve" labels="VARIABLE">
                                                <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                              </id>
                                              <id xml:space="preserve" labels="VARIABLE">α</id>
                                            </apply>
                                            <id xml:space="preserve" labels="VARIABLE">
                                              <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                            </id>
                                          </apply>
                                        </parens>
                                      </apply>
                                    </parens>
                                    <id xml:space="preserve" labels="VARIABLE">t</id>
                                  </apply>
                                  <id xml:space="preserve" labels="CONSTANT">π</id>
                                </apply>
                                <imag symbol="i">1</imag>
                              </apply>
                            </apply>
                          </sequence>
                        </apply>
                      </apply>
                      <apply>
                        <plus />
                        <apply>
                          <mult />
                          <apply>
                            <mult />
                            <imag symbol="i">1</imag>
                            <apply>
                              <pow />
                              <id xml:space="preserve" labels="CONSTANT">e</id>
                              <apply>
                                <div />
                                <apply>
                                  <mult />
                                  <apply>
                                    <mult />
                                    <parens>
                                      <apply>
                                        <plus />
                                        <apply>
                                          <neg />
                                          <parens>
                                            <apply>
                                              <mult />
                                              <real>2</real>
                                              <id xml:space="preserve" labels="VARIABLE">f</id>
                                            </apply>
                                          </parens>
                                        </apply>
                                        <parens>
                                          <apply>
                                            <minus />
                                            <apply>
                                              <mult />
                                              <id xml:space="preserve" labels="VARIABLE">
                                                <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                              </id>
                                              <id xml:space="preserve" labels="VARIABLE">α</id>
                                            </apply>
                                            <id xml:space="preserve" labels="VARIABLE">
                                              <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                            </id>
                                          </apply>
                                        </parens>
                                      </apply>
                                    </parens>
                                    <id xml:space="preserve" labels="CONSTANT">π</id>
                                  </apply>
                                  <imag symbol="i">1</imag>
                                </apply>
                                <apply>
                                  <mult />
                                  <apply>
                                    <mult />
                                    <real>4</real>
                                    <id xml:space="preserve" labels="VARIABLE">
                                      <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                    </id>
                                  </apply>
                                  <id xml:space="preserve" labels="VARIABLE">α</id>
                                </apply>
                              </apply>
                            </apply>
                          </apply>
                          <apply>
                            <id xml:space="preserve" labels="FUNCTION">Ei</id>
                            <sequence>
                              <real>1</real>
                              <apply>
                                <plus />
                                <apply>
                                  <neg />
                                  <apply>
                                    <div />
                                    <apply>
                                      <mult />
                                      <apply>
                                        <mult />
                                        <parens>
                                          <apply>
                                            <plus />
                                            <apply>
                                              <mult />
                                              <real>2</real>
                                              <id xml:space="preserve" labels="VARIABLE">f</id>
                                            </apply>
                                            <parens>
                                              <apply>
                                                <minus />
                                                <id xml:space="preserve" labels="VARIABLE">
                                                  <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                                </id>
                                                <apply>
                                                  <mult />
                                                  <id xml:space="preserve" labels="VARIABLE">
                                                    <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                                  </id>
                                                  <id xml:space="preserve" labels="VARIABLE">α</id>
                                                </apply>
                                              </apply>
                                            </parens>
                                          </apply>
                                        </parens>
                                        <id xml:space="preserve" labels="CONSTANT">π</id>
                                      </apply>
                                      <imag symbol="i">1</imag>
                                    </apply>
                                    <apply>
                                      <mult />
                                      <apply>
                                        <mult />
                                        <real>4</real>
                                        <id xml:space="preserve" labels="VARIABLE">
                                          <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                        </id>
                                      </apply>
                                      <id xml:space="preserve" labels="VARIABLE">α</id>
                                    </apply>
                                  </apply>
                                </apply>
                                <apply>
                                  <mult />
                                  <apply>
                                    <mult />
                                    <apply>
                                      <mult />
                                      <parens>
                                        <apply>
                                          <plus />
                                          <apply>
                                            <mult />
                                            <real>2</real>
                                            <id xml:space="preserve" labels="VARIABLE">f</id>
                                          </apply>
                                          <parens>
                                            <apply>
                                              <minus />
                                              <id xml:space="preserve" labels="VARIABLE">
                                                <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                              </id>
                                              <apply>
                                                <mult />
                                                <id xml:space="preserve" labels="VARIABLE">
                                                  <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                                </id>
                                                <id xml:space="preserve" labels="VARIABLE">α</id>
                                              </apply>
                                            </apply>
                                          </parens>
                                        </apply>
                                      </parens>
                                      <id xml:space="preserve" labels="VARIABLE">t</id>
                                    </apply>
                                    <id xml:space="preserve" labels="CONSTANT">π</id>
                                  </apply>
                                  <imag symbol="i">1</imag>
                                </apply>
                              </apply>
                            </sequence>
                          </apply>
                        </apply>
                        <parens>
                          <apply>
                            <minus />
                            <apply>
                              <plus />
                              <apply>
                                <mult />
                                <apply>
                                  <pow />
                                  <id xml:space="preserve" labels="CONSTANT">e</id>
                                  <apply>
                                    <div />
                                    <apply>
                                      <mult />
                                      <apply>
                                        <mult />
                                        <parens>
                                          <apply>
                                            <minus />
                                            <apply>
                                              <neg />
                                              <parens>
                                                <apply>
                                                  <mult />
                                                  <real>2</real>
                                                  <id xml:space="preserve" labels="VARIABLE">f</id>
                                                </apply>
                                              </parens>
                                            </apply>
                                            <parens>
                                              <apply>
                                                <plus />
                                                <apply>
                                                  <mult />
                                                  <id xml:space="preserve" labels="VARIABLE">
                                                    <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                                  </id>
                                                  <id xml:space="preserve" labels="VARIABLE">α</id>
                                                </apply>
                                                <id xml:space="preserve" labels="VARIABLE">
                                                  <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
                                                </id>
                                              </apply>
                                            </parens>
                                          </apply>
                                        </parens>
                                        <id xml:space="preserve" labels="CONSTANT">π</id>
                                      </apply>
                                      <imag symbol="i">1</imag>
                                    </apply>
                                    <apply>
                                      <mult />
                                      <apply>
                                        <mult />
                                        <real>4</real>
                                        <id xml:space="preserve" labels="VARIABLE">
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    </define>
    <resultFormat>
      <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" />
    </resultFormat>
    <formattingOverride FontSize="10" />
  </math>
</region>

2. Utilizzare getVariables per creare un vettore di tutte le variabili di espressione A.

<region id="ID0EVNBFB" actualWidth="172.11000000000004" actualHeight="83.591200000000015" top="192.00000000000003" left="19.200000000000003" xmlns="http://schemas.mathsoft.com/worksheet50">
  <math resultRef="6">
    <symEval xmlns="http://schemas.mathsoft.com/math50">
      <apply>
        <id xml:space="preserve" labels="FUNCTION" label-is-contextual="true">getVariables</id>
        <id xml:space="preserve" labels="VARIABLE" label-is-contextual="true">A</id>
      </apply>
      <command>
        <placeholder />
      </command>
      <symResult>
        <matrix rows="4" cols="1">
          <id xml:space="preserve" labels="VARIABLE">
            <Span xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">R<Subscript xmlns="clr-namespace:Ptc.Wpf;assembly=Ptc.Core">s</Subscript></Span>
          </id>
          <id xml:space="preserve" labels="VARIABLE">α</id>
          <id xml:space="preserve" labels="VARIABLE">f</id>
          <id xml:space="preserve" labels="VARIABLE">t</id>
        </matrix>
      </symResult>
    </symEval>
    <resultFormat>
      <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" />
    </resultFormat>
  </math>
</region>

3. Utilizzare hasVariables per determinare se nell'espressione sono presenti variabili.

4. Utilizzare hasVariables per determinare se f è una variabile presente nell'espressione.

5. Utilizzare hasVariables per determinare se k è una variabile dell'espressione A.

Si può notare che f è una variabile dell'espressione, mentre k non lo è.

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Funzioni per l'identificazione del tipo di espressione

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