创建瀑布图

1. 在工作表中，插入 XY 绘图。

2. 要定义瀑布图的多个轨迹，在轴占位符中，键入以下表达式：

表达式	说明
y 轴	y 值的单值矩阵
x 轴	x 值的单值矩阵

3. 将轨迹类型改为瀑布图轨迹。在瀑布图中，x 矩阵和 y 矩阵的每一列出现一个轨迹。

附加信息

• 瀑布图可用于在一个图中绘制多个数据集。

• 如果矩阵没有相同数目的行，则会忽略额外行。在矢量为不同长度时会发生这种情况。在下图中，忽略 y 矩阵的最后一行，因为其在 x 矩阵中没有匹配的行。

• 如果矩阵列数不同，则使用最短矩阵的最后一列补充缺失列。下文中，PTC Mathcad 两次使用 x 矩阵的最后一列以填充缺失数据。

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      <title class="- topic/title " wwtype:type="Paragraph" xmlns:wwtype="urn:WebWorks-Type-Schema" />
      <legend />
      <traces>
        <trace resultRef="32">
          <traceStyle color="#FF00008B" symbol="none" line-weight="1" line-style="Solid">waterfall</traceStyle>
        </trace>
      </traces>
      <graph-size width="230.4" height="230.4" />
      <axes>
        <xAxis rank="1" legend-position="PlotBoundaryBottom" start="1" end="6">
          <axisLine position="bottom" positionticmark="-1" legendWidth="91.5166666666667" />
          <axisGrid>
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            <gridLabels display="true" />
            <gridLines />
            <tickMarks display="true" />
          </axisGrid>
          <axisLabel />
          <markers />
          <plotEquations>
            <plotEquation>
              <math resultRef="33">
                <matrix rows="3" cols="2" xmlns="http://schemas.mathsoft.com/math50">
                  <real>1</real>
                  <real>3</real>
                  <real>6</real>
                  <real>1</real>
                  <real>3</real>
                  <real>6</real>
                </matrix>
              </math>
              <math resultRef="34">
                <placeholder xmlns="http://schemas.mathsoft.com/math50" />
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          <xyDomain scale-type="linear" auto-scale="true">
            <startValue>
              <placeholder xmlns="http://schemas.mathsoft.com/math50" />
            </startValue>
            <endValue>
              <placeholder xmlns="http://schemas.mathsoft.com/math50" />
            </endValue>
          </xyDomain>
        </xAxis>
        <yAxis rank="1" legend-position="PlotBoundaryLeft" start="1" end="10">
          <axisLine position="left" positionticmark="-1" legendWidth="115.476666666667" />
          <axisGrid>
            <gridFrequency>11</gridFrequency>
            <gridLabels display="true" />
            <gridLines />
            <tickMarks display="true" />
          </axisGrid>
          <axisLabel />
          <markers />
          <plotEquations>
            <plotEquation>
              <math resultRef="35">
                <matrix rows="4" cols="3" xmlns="http://schemas.mathsoft.com/math50">
                  <real>1</real>
                  <real>4</real>
                  <real>7</real>
                  <real>8</real>
                  <real>2</real>
                  <real>5</real>
                  <real>8</real>
                  <real>9</real>
                  <real>3</real>
                  <real>6</real>
                  <real>9</real>
                  <real>10</real>
                </matrix>
              </math>
              <math resultRef="36">
                <placeholder xmlns="http://schemas.mathsoft.com/math50" />
              </math>
            </plotEquation>
          </plotEquations>
          <xyDomain scale-type="linear" auto-scale="true">
            <startValue>
              <placeholder xmlns="http://schemas.mathsoft.com/math50" />
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            <endValue>
              <placeholder xmlns="http://schemas.mathsoft.com/math50" />
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          </xyDomain>
        </yAxis>
      </axes>
    </xyPlot>
  </plot>
</region>

您可通过单独定义每一个矢量来创建相同的绘图，方法如下：

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              <math resultRef="51">
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        </yAxis>
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