示例：创建瀑布图

绘制以稍微不同的值重复单个参数的数据。

二维瀑布图

将所有相关变量值压缩为矩阵的列，并将独立变量值打包为另一矩阵的列。2D 绘图将列配对并创建多个轨迹。

1. 定义瀑布数据集。

2. 对变量赋予行数和列数。

3. 将矢量定义为第二个数据集。

4. 要对每个矢量条目和每个矩阵条目提供偏移，可通过矢量创建矩阵。

稍微偏移新矩阵值以避免轨迹重叠。

5. 绘制两个矩阵。

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    <xyPlot>
      <title class="- topic/title " wwtype:type="Paragraph" xmlns:wwtype="urn:WebWorks-Type-Schema" />
      <legend />
      <traces>
        <trace resultRef="74">
          <traceStyle color="#FF0080C0" symbol="none" line-weight="1" line-style="Solid">waterfall</traceStyle>
        </trace>
      </traces>
      <graph-size width="318.000009763241" height="201.600006008148" />
      <axes>
        <xAxis rank="1" legend-position="PlotBoundaryBottom" start="-1.5" end="12">
          <axisLine position="bottom" positionticmark="-1" legendWidth="68.66" />
          <axisGrid>
            <gridFrequency>10</gridFrequency>
            <gridLabels display="false" />
            <gridLines />
            <tickMarks display="true" />
          </axisGrid>
          <axisLabel />
          <markers />
          <numberFormat>
            <general precision="3" show-trailing-zeros="false" radix="dec" zero-threshold="15" imaginary-value="i" exponential-threshold="3" />
          </numberFormat>
          <plotEquations>
            <plotEquation>
              <math resultRef="79">
                <id xml:space="preserve" xmlns="http://schemas.mathsoft.com/math50">xo</id>
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              <math resultRef="80">
                <placeholder xmlns="http://schemas.mathsoft.com/math50" />
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          <xyDomain scale-type="linear" auto-scale="true">
            <startValue resultRef="76">
              <real xmlns="http://schemas.mathsoft.com/math50">-1</real>
            </startValue>
            <endValue resultRef="78">
              <real xmlns="http://schemas.mathsoft.com/math50">12</real>
            </endValue>
          </xyDomain>
        </xAxis>
        <yAxis rank="1" legend-position="PlotBoundaryLeft" start="0" end="1">
          <axisLine position="left" positionticmark="-1" legendWidth="68.47" />
          <axisGrid>
            <gridFrequency>11</gridFrequency>
            <gridLabels display="false" />
            <gridLines />
            <tickMarks display="true" />
          </axisGrid>
          <axisLabel />
          <markers />
          <numberFormat>
            <general precision="3" show-trailing-zeros="false" radix="dec" zero-threshold="15" imaginary-value="i" exponential-threshold="3" />
          </numberFormat>
          <plotEquations>
            <plotEquation>
              <math resultRef="83">
                <id xml:space="preserve" xmlns="http://schemas.mathsoft.com/math50">yo</id>
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              <math resultRef="84">
                <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 resultRef="82">
              <real xmlns="http://schemas.mathsoft.com/math50">1</real>
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          </xyDomain>
        </yAxis>
      </axes>
    </xyPlot>
  </plot>
</region>

不同长度的轨迹

通过 NaN 将空的条目压缩在数组中，显示不等长度的轨迹。

1. 1. 向矩阵添加空条目。

2. 绘制新数据。

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    <xyPlot>
      <title class="- topic/title " wwtype:type="Paragraph" xmlns:wwtype="urn:WebWorks-Type-Schema" />
      <legend />
      <traces>
        <trace resultRef="98">
          <traceStyle color="#FF14BA7C" symbol="none" line-weight="1" line-style="Solid">waterfall</traceStyle>
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      <axes>
        <xAxis rank="1" legend-position="PlotBoundaryBottom" start="-1.5" end="12">
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            <gridLabels display="false" />
            <gridLines />
            <tickMarks display="true" />
          </axisGrid>
          <axisLabel />
          <markers />
          <numberFormat>
            <general precision="3" show-trailing-zeros="false" radix="dec" zero-threshold="15" imaginary-value="i" exponential-threshold="3" />
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          <plotEquations>
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              <math resultRef="103">
                <id xml:space="preserve" xmlns="http://schemas.mathsoft.com/math50">xo</id>
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                <placeholder xmlns="http://schemas.mathsoft.com/math50" />
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            <startValue resultRef="100">
              <real xmlns="http://schemas.mathsoft.com/math50">-1</real>
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            <endValue resultRef="102">
              <real xmlns="http://schemas.mathsoft.com/math50">12</real>
            </endValue>
          </xyDomain>
        </xAxis>
        <yAxis rank="1" legend-position="PlotBoundaryLeft" start="0" end="1">
          <axisLine position="left" positionticmark="-1" legendWidth="68.47" />
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            <gridLabels display="false" />
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            <tickMarks display="true" />
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          <axisLabel />
          <markers />
          <numberFormat>
            <general precision="3" show-trailing-zeros="false" radix="dec" zero-threshold="15" imaginary-value="i" exponential-threshold="3" />
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          <plotEquations>
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不会显示 NaN 条目，将在行中留空。

3D 瀑布图

1. 在 3D 绘图中绘制矩阵。出现三维形式的瀑布图。

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    <plot3D>
      <traces>
        <trace3D resultRef="113">
          <traceStyle color="#FF000000">surface</traceStyle>
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      <graph-size width="230.39999999999995" height="230.39999999999998" />
      <axes>
        <xAxis rank="1" start="0" end="100">
          <axisLine />
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            <gridFrequency>5</gridFrequency>
            <gridLabels display="true" />
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          <axisLabel />
          <xyDomain scale-type="linear" auto-scale="true" allow-negative-values="true">
            <startValue />
            <endValue />
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          <axisLine />
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            <gridFrequency>5</gridFrequency>
            <gridLabels display="true" />
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          <axisLabel />
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            <startValue />
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        <zAxis rank="1" start="0" end="1">
          <axisLine />
          <axisGrid>
            <gridFrequency>5</gridFrequency>
            <gridLabels display="true" />
            <gridLines />
            <tickMarks display="true" />
          </axisGrid>
          <axisLabel />
          <zDomain auto-scale="true" allow-negative-values="true" scale-type="linear">
            <startValue />
            <endValue />
          </zDomain>
        </zAxis>
      </axes>
      <plotEquations>
        <plotEquation>
          <math>
            <id xml:space="preserve" xmlns="http://schemas.mathsoft.com/math50">y</id>
          </math>
          <math>
            <placeholder xmlns="http://schemas.mathsoft.com/math50" />
          </math>
        </plotEquation>
      </plotEquations>
      <CameraTransformMatrix Columns="4" Rows="4">
        <Cells>
          <Cell>1</Cell>
          <Cell>0</Cell>
          <Cell>0</Cell>
          <Cell>0</Cell>
          <Cell>0</Cell>
          <Cell>1</Cell>
          <Cell>0</Cell>
          <Cell>0</Cell>
          <Cell>0</Cell>
          <Cell>0</Cell>
          <Cell>1</Cell>
          <Cell>0</Cell>
          <Cell>0</Cell>
          <Cell>0</Cell>
          <Cell>0</Cell>
          <Cell>1</Cell>
        </Cells>
      </CameraTransformMatrix>
    </plot3D>
  </plot>
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不同于 2D 绘图，可通过旋转、平移或放大/缩小来更改绘图的视图。