示例：CTOL 对求解命令块的影响

求解块 > 示例：CTOL 对求解命令块的影响

示例：CTOL 对求解命令块的影响

可以使用 CTOL 设置求解命令块结果的精度。

1. 设置 CTOL 的值。

2. 定义求解命令块。

<region id="ID0ETLNLB" actualWidth="194.98333333333335" actualHeight="191.70000000000002" top="57.600000000000009" left="38.400000000000006" height="191.70000000000002" width="194.98333333333335" xmlns="http://schemas.mathsoft.com/worksheet50">
  <solveblock>
    <regions>
      <region id="" actualWidth="41.346666666666664" actualHeight="25.6" top="38.400000000000006" left="38.400000000000006" solve-block-category="guess-value">
        <math resultRef="14">
          <define xmlns="http://schemas.mathsoft.com/math50">
            <id labels="VARIABLE" xml:space="preserve">x</id>
            <real>2</real>
          </define>
        </math>
      </region>
      <region id="" actualWidth="78.173333333333346" actualHeight="25.6" top="76.800000000000011" left="38.400000000000006" solve-block-category="constraint">
        <math resultRef="15">
          <apply xmlns="http://schemas.mathsoft.com/math50">
            <equal />
            <apply>
              <id xml:space="preserve">exp</id>
              <id xml:space="preserve">x</id>
            </apply>
            <real>2</real>
          </apply>
        </math>
      </region>
      <region id="" actualWidth="67.516666666666666" actualHeight="25.6" top="115.20000000000002" left="38.400000000000006" solve-block-category="constraint">
        <math resultRef="16">
          <apply xmlns="http://schemas.mathsoft.com/math50">
            <lessThan />
            <id xml:space="preserve">x</id>
            <real>0.693</real>
          </apply>
        </math>
      </region>
      <region id="" actualWidth="156.58333333333334" actualHeight="25.6" top="172.8" left="38.400000000000006" solve-block-category="solver">
        <math resultRef="17">
          <define xmlns="http://schemas.mathsoft.com/math50">
            <id labels="VARIABLE" xml:space="preserve">res</id>
            <eval>
              <apply>
                <id labels="KEYWORD" xml:space="preserve" algorithm="autoSelect-nonlinearLevenbergMarquardt">find</id>
                <id labels="SYSTEM" xml:space="preserve" label-is-contextual="true">x</id>
              </apply>
              <unitOverride>
                <placeholder />
              </unitOverride>
            </eval>
          </define>
        </math>
      </region>
    </regions>
  </solveblock>
</region>

3. 与精确答案进行比较。

通过比较结果和 CTOL 约束之间的差异，可以看到结果在所设置的范围内。

4. 可以减小 CTOL 的值。

5. 使用新的 CTOL 值校验约束。

<region id="ID0ECRNLB" actualWidth="191.666666666667" actualHeight="191.7" top="460.80000000000007" left="38.400000000000006" height="191.7" width="191.666666666667" xmlns="http://schemas.mathsoft.com/worksheet50">
  <solveblock>
    <regions>
      <region id="" actualWidth="41.346666666666664" actualHeight="25.6" top="38.4" left="38.4" solve-block-category="guess-value">
        <math resultRef="21">
          <define xmlns="http://schemas.mathsoft.com/math50">
            <id labels="VARIABLE" xml:space="preserve">x</id>
            <real>2</real>
          </define>
          <resultFormat>
            <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" />
          </resultFormat>
        </math>
      </region>
      <region id="" actualWidth="78.173333333333346" actualHeight="25.6" top="76.8" left="38.4" solve-block-category="constraint">
        <math resultRef="22">
          <apply xmlns="http://schemas.mathsoft.com/math50">
            <equal />
            <apply>
              <id xml:space="preserve">exp</id>
              <id xml:space="preserve">x</id>
            </apply>
            <real>2</real>
          </apply>
          <resultFormat>
            <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" />
          </resultFormat>
        </math>
      </region>
      <region id="" actualWidth="67.516666666666666" actualHeight="25.6" top="115.2" left="38.4" solve-block-category="constraint">
        <math resultRef="23">
          <apply xmlns="http://schemas.mathsoft.com/math50">
            <lessThan />
            <id xml:space="preserve">x</id>
            <real>0.693</real>
          </apply>
          <resultFormat>
            <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" />
          </resultFormat>
        </math>
      </region>
      <region id="" actualWidth="90.186666666666667" actualHeight="25.6" top="172.8" left="38.4" solve-block-category="solver">
        <math resultRef="24">
          <eval xmlns="http://schemas.mathsoft.com/math50">
            <apply>
              <id labels="KEYWORD" xml:space="preserve" algorithm="">find</id>
              <id xml:space="preserve">x</id>
            </apply>
            <unitOverride>
              <placeholder />
            </unitOverride>
          </eval>
          <resultFormat>
            <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" />
          </resultFormat>
        </math>
      </region>
    </regions>
  </solveblock>
</region>

结果不在范围之内。

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