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        <p>iplot</p>
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          <e type="function" args="3">for</e>
          <e type="function" args="3">for</e>
          <e type="operand">M</e>
          <e type="function" args="1">mat2sys.1</e>
          <e type="function" args="1">eval</e>
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          <e type="operand">1</e>
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          <e type="operator" args="2">:</e>
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          <e type="operand">λ</e>
          <e type="function" args="4">iplot2</e>
          <e type="operand">xmin</e>
          <e type="operand">xmax</e>
          <e type="operand">ymin</e>
          <e type="operand">ymax</e>
          <e type="operand">2</e>
          <e type="operand">2</e>
          <e type="function" args="6">mat</e>
          <e type="operand">B</e>
          <e type="operator" args="2">:</e>
          <e type="operand">nx</e>
          <e type="operand">ny</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">mat</e>
          <e type="operand">N</e>
          <e type="operator" args="2">:</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" args="4">mat</e>
          <e type="operand">Δx</e>
          <e type="operand">xmax</e>
          <e type="operand">xmin</e>
          <e type="operator" args="2">-</e>
          <e type="operand">nx</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">:</e>
          <e type="operand">Δy</e>
          <e type="operand">ymax</e>
          <e type="operand">ymin</e>
          <e type="operator" args="2">-</e>
          <e type="operand">ny</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">:</e>
          <e type="operand">M</e>
          <e type="operand">0</e>
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          <e type="function" args="2">matrix</e>
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          <e type="function" args="5">mat</e>
          <e type="operand">n</e>
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          <e type="operand">nx</e>
          <e type="operand">1</e>
          <e type="operator" args="2">-</e>
          <e type="bracket">(</e>
          <e type="function" args="2">range</e>
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          <e type="operand">0</e>
          <e type="operand">ny</e>
          <e type="operand">1</e>
          <e type="operator" args="2">-</e>
          <e type="bracket">(</e>
          <e type="function" args="2">range</e>
          <e type="operand">r</e>
          <e type="operand">Δx</e>
          <e type="operand">n</e>
          <e type="operator" args="2">*</e>
          <e type="operand">xmin</e>
          <e type="operator" args="2">+</e>
          <e type="operand">Δy</e>
          <e type="operand">m</e>
          <e type="operator" args="2">*</e>
          <e type="operand">ymin</e>
          <e type="operator" args="2">+</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">mat</e>
          <e type="operator" args="2">:</e>
          <e type="operand">η</e>
          <e type="operand">1</e>
          <e type="operator" args="2">:</e>
          <e type="operand">ϕ</e>
          <e type="operand">5</e>
          <e type="operand">1</e>
          <e type="function" args="2">matrix</e>
          <e type="operator" args="2">:</e>
          <e type="operand">1</e>
          <e type="operand">3</e>
          <e type="function" args="5">mat</e>
          <e type="operand">k</e>
          <e type="operand">1</e>
          <e type="operand">5</e>
          <e type="function" args="2">range</e>
          <e type="operand">P</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">μi</e>
          <e type="operand">¦ipμ</e>
          <e type="operand">k</e>
          <e type="function" args="2">col</e>
          <e type="operator" args="2">:</e>
          <e type="operand">r</e>
          <e type="operand">Δx</e>
          <e type="operand">Δy</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">mat</e>
          <e type="operand">μi</e>
          <e type="operator" args="2">*</e>
          <e type="function" args="1">vectorize</e>
          <e type="operator" args="2">+</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">line</e>
          <e type="function" args="1">eval</e>
          <e type="operator" args="2">:</e>
          <e type="operand">ϕ</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">P</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">1</e>
          <e type="function" args="2">el</e>
          <e type="operand">P</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">2</e>
          <e type="function" args="2">el</e>
          <e type="function" args="2">F</e>
          <e type="operand">λ</e>
          <e type="operator" args="2">-</e>
          <e type="operator" args="2">:</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">line</e>
          <e type="function" args="3">for</e>
          <e type="operand">k</e>
          <e type="operand">1</e>
          <e type="operand">4</e>
          <e type="function" args="2">range</e>
          <e type="operand">ϕ</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">0</e>
          <e type="operator" args="2">&lt;</e>
          <e type="operand">η</e>
          <e type="operand">η</e>
          <e type="operand">2</e>
          <e type="operand">k</e>
          <e type="operand">1</e>
          <e type="operator" args="2">-</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">+</e>
          <e type="operator" args="2">:</e>
          <e type="operand">continue</e>
          <e type="function" args="3">if</e>
          <e type="function" args="3">for</e>
          <e type="operand">ϕ</e>
          <e type="operand">5</e>
          <e type="function" args="2">el</e>
          <e type="operand">0</e>
          <e type="operator" args="2">&lt;</e>
          <e type="operand">η</e>
          <e type="operand">11</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">η</e>
          <e type="operand">6</e>
          <e type="operator" args="2">:</e>
          <e type="operand">η</e>
          <e type="operand">6</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">η</e>
          <e type="operand">11</e>
          <e type="operator" args="2">:</e>
          <e type="operand">0</e>
          <e type="function" args="3">if</e>
          <e type="function" args="3">if</e>
          <e type="operand">0</e>
          <e type="function" args="3">if</e>
          <e type="operand">¦ipE</e>
          <e type="operand">η</e>
          <e type="function" args="2">el</e>
          <e type="operand">0</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">continue</e>
          <e type="operand">v</e>
          <e type="operand">¦ipB</e>
          <e type="operand">η</e>
          <e type="function" args="2">col</e>
          <e type="operator" args="2">:</e>
          <e type="operand">ν</e>
          <e type="operand">1</e>
          <e type="operator" args="2">:</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" args="4">mat</e>
          <e type="operand">k</e>
          <e type="operand">1</e>
          <e type="operand">4</e>
          <e type="function" args="2">range</e>
          <e type="operand">v</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">0</e>
          <e type="operator" args="2">≠</e>
          <e type="operand">k1</e>
          <e type="operand">k</e>
          <e type="operand">1</e>
          <e type="operator" args="2">+</e>
          <e type="operand">4</e>
          <e type="operand">k</e>
          <e type="operand">4</e>
          <e type="operator" args="2">≡</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">-</e>
          <e type="operator" args="2">:</e>
          <e type="operand">v</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">P</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">ϕ</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">ϕ</e>
          <e type="operand">k1</e>
          <e type="function" args="2">el</e>
          <e type="operand">ϕ</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operator" args="2">-</e>
          <e type="operator" args="2">/</e>
          <e type="operand">P</e>
          <e type="operand">k1</e>
          <e type="function" args="2">el</e>
          <e type="operand">P</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operator" args="2">-</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">-</e>
          <e type="operator" args="2">:</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">line</e>
          <e type="operand">0</e>
          <e type="function" args="3">if</e>
          <e type="function" args="3">for</e>
          <e type="operand">¦ipT</e>
          <e type="operand">η</e>
          <e type="operand">ν</e>
          <e type="function" args="3">el</e>
          <e type="operand">0</e>
          <e type="operator" args="2">≠</e>
          <e type="bracket">(</e>
          <e type="operand">ν</e>
          <e type="operand">4</e>
          <e type="operator" args="2">&lt;</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">&amp;</e>
          <e type="operand">M</e>
          <e type="operand">M</e>
          <e type="operand">¦NaN</e>
          <e type="operand">¦NaN</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" args="4">mat</e>
          <e type="operand">v</e>
          <e type="operand">¦ipT</e>
          <e type="operand">η</e>
          <e type="operand">ν</e>
          <e type="function" args="3">el</e>
          <e type="function" args="2">el</e>
          <e type="operand">v</e>
          <e type="operand">¦ipT</e>
          <e type="operand">η</e>
          <e type="operand">ν</e>
          <e type="operand">1</e>
          <e type="operator" args="2">+</e>
          <e type="function" args="3">el</e>
          <e type="function" args="2">el</e>
          <e type="function" args="2">augment</e>
          <e type="function" args="1">transpose</e>
          <e type="function" args="3">stack</e>
          <e type="operator" args="2">:</e>
          <e type="operand">ν</e>
          <e type="operand">ν</e>
          <e type="operand">2</e>
          <e type="operator" args="2">+</e>
          <e type="operator" args="2">:</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">line</e>
          <e type="function" args="2">while</e>
          <e type="operand">3</e>
          <e type="operand">1</e>
          <e type="function" args="5">line</e>
          <e type="function" args="3">if</e>
          <e type="operand">5</e>
          <e type="operand">1</e>
          <e type="function" args="7">line</e>
          <e type="function" args="3">for</e>
          <e type="function" args="3">for</e>
          <e type="operand">M</e>
          <e type="function" args="1">eval</e>
          <e type="operand">4</e>
          <e type="operand">1</e>
          <e type="function" args="6">line</e>
          <e type="operator" args="2">:</e>
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    <region id="7" top="1161" color="#000000" bgColor="#ffffff">
      <area terminator="true" />
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  </region>
  <region id="8" left="27" top="1197" width="261" height="38" color="#000000" bgColor="#ffffff" fontSize="10">
    <math optimize="2">
      <input>
        <e type="operand">x</e>
        <e type="operand">y</e>
        <e type="function" args="2">f.1</e>
        <e type="operand">4</e>
        <e type="operand">x</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">*</e>
        <e type="operand">7</e>
        <e type="operand">y</e>
        <e type="operand">5</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">-</e>
        <e type="operand">12</e>
        <e type="operand">x</e>
        <e type="function" args="1">cos</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">-</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="9" left="306" top="1197" width="102" height="45" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">Box</e>
        <e type="operand">4</e>
        <e type="operator" args="1">-</e>
        <e type="operand">4</e>
        <e type="operand">4</e>
        <e type="operator" args="1">-</e>
        <e type="operand">4</e>
        <e type="operand">2</e>
        <e type="operand">2</e>
        <e type="function" args="6">mat</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="10" left="423" top="1197" width="84" height="45" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">Nxy</e>
        <e type="operand">40</e>
        <e type="operand">40</e>
        <e type="operand">2</e>
        <e type="operand">1</e>
        <e type="function" args="4">mat</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="11" left="585" top="1197" width="90" height="24" color="#000000" bgColor="#ffff80" fontSize="10">
    <math>
      <input>
        <e type="operand">¦NaN</e>
        <e type="operand">10</e>
        <e type="operator" args="1">-</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="12" left="27" top="1233" width="263" height="38" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">x</e>
        <e type="operand">y</e>
        <e type="function" args="2">f.2</e>
        <e type="operand">4</e>
        <e type="operand">x</e>
        <e type="operand">4</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">*</e>
        <e type="operand">2</e>
        <e type="operand">y</e>
        <e type="operand">4</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">+</e>
        <e type="operand">45</e>
        <e type="operand">x</e>
        <e type="function" args="1">cos</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">-</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="13" left="27" top="1287" width="357" height="232" color="#000000" bgColor="#ffffff" fontSize="10">
    <plot type="2d" render="lines" scale_x="3.79749833583241" scale_y="3.79749833583241" scale_z="3.79749833583241" rotate_x="0" rotate_y="0" rotate_z="0" transpose_x="0" transpose_y="0" transpose_z="0">
      <input>
        <e type="operand">x</e>
        <e type="operand">y</e>
        <e type="function" args="2">f.1</e>
        <e type="operand">Box</e>
        <e type="operand">Nxy</e>
        <e type="operand">0</e>
        <e type="function" args="4">iplot</e>
        <e type="operand">x</e>
        <e type="operand">y</e>
        <e type="function" args="2">f.2</e>
        <e type="operand">Box</e>
        <e type="operand">Nxy</e>
        <e type="operand">0</e>
        <e type="function" args="4">iplot</e>
        <e type="operand">2</e>
        <e type="operand">1</e>
        <e type="function" args="4">sys</e>
      </input>
    </plot>
  </region>
  <region id="14" left="396" top="1287" width="357" height="232" color="#000000" bgColor="#ffffff" fontSize="10">
    <plot type="2d" render="lines" scale_x="3.79749833583241" scale_y="3.79749833583241" scale_z="3.79749833583241" rotate_x="0" rotate_y="0" rotate_z="0" transpose_x="0" transpose_y="0" transpose_z="0">
      <input>
        <e type="operand">x</e>
        <e type="operand">y</e>
        <e type="function" args="2">f.1</e>
        <e type="operand">Box</e>
        <e type="operand">Nxy</e>
        <e type="operand">0</e>
        <e type="function" args="4">iplot2</e>
        <e type="operand">x</e>
        <e type="operand">y</e>
        <e type="function" args="2">f.2</e>
        <e type="operand">Box</e>
        <e type="operand">Nxy</e>
        <e type="operand">0</e>
        <e type="function" args="4">iplot2</e>
        <e type="operand">2</e>
        <e type="operand">1</e>
        <e type="function" args="4">sys</e>
      </input>
    </plot>
  </region>
  <region id="15" left="36" top="1611" width="119" height="24" color="#000000" bgColor="#ffffff" fontSize="10">
    <text lang="eng">
      <p>Contour lines</p>
    </text>
  </region>
  <region id="16" left="27" top="1638" width="594" height="409" color="#000000" bgColor="#ffffff" fontSize="10">
    <plot type="2d" render="lines" scale_x="5.34083438727056" scale_y="7.89850063273013" scale_z="7.81951562640283" rotate_x="0" rotate_y="0" rotate_z="0" transpose_x="3" transpose_y="3" transpose_z="0">
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        <e type="operand">M</e>
        <e type="operand">0</e>
        <e type="operator" args="2">:</e>
        <e type="operand">k</e>
        <e type="operand">0</e>
        <e type="operand">8</e>
        <e type="function" args="2">range</e>
        <e type="operand">M</e>
        <e type="operand">k</e>
        <e type="operand">1</e>
        <e type="operator" args="2">+</e>
        <e type="function" args="2">el</e>
        <e type="operand">x</e>
        <e type="operand">y</e>
        <e type="function" args="2">f.2</e>
        <e type="operand">Box</e>
        <e type="operand">0.25</e>
        <e type="operand">Nxy</e>
        <e type="operator" args="2">*</e>
        <e type="operand">120</e>
        <e type="operand">k</e>
        <e type="operator" args="2">*</e>
        <e type="function" args="4">iplot</e>
        <e type="operator" args="2">:</e>
        <e type="function" args="3">for</e>
        <e type="operand">M</e>
        <e type="function" args="1">mat2sys.1</e>
        <e type="function" args="1">eval</e>
        <e type="operand">3</e>
        <e type="operand">1</e>
        <e type="function" args="5">line</e>
      </input>
    </plot>
  </region>
  <region id="17" left="198" top="2970" width="20" height="24" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">X</e>
      </input>
    </math>
  </region>
</regions>