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    <text lang="ger">
      <p>Das Beispiel zeigt die numerische Ableitung mit dem zentralen Differenzenquotientenund ihre Umkehrung (Integration mit der Trapezregel) </p>
    </text>
    <text lang="fre">
      <p>L'exemple montre l'aproximation de la première dérivé par différence centraleet son inverse (integration par la régle trapézoïdale) </p>
    </text>
    <text lang="eng">
      <p>The example shows the approximation of the first derivative by central difference and it's inverse (integration by trapezoidal rule) </p>
    </text>
  </region>
  <region id="1" left="27" top="54" width="321" height="40" color="#000000" bgColor="#ffffff" fontSize="10">
    <text lang="eng">
      <p>set N = even/odd to escape divide by 0maybe other singularities.</p>
    </text>
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      <description active="true" position="Top" lang="eng">
        <p>[L,H] range Npts</p>
      </description>
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        <e type="operand">L</e>
        <e type="operand">5</e>
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        <e type="operand">5</e>
        <e type="operator" args="2">:</e>
        <e type="operand">m</e>
        <e type="operand">200</e>
        <e type="operator" args="2">:</e>
        <e type="operand" style="string" />
        <e type="operand">1</e>
        <e type="operand">4</e>
        <e type="function" preserve="true" args="6">mat</e>
        <e type="operand">1</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="3">sys</e>
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    </math>
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    <math>
      <input>
        <e type="operand">λ</e>
        <e type="operand">99</e>
        <e type="operator" args="2">:</e>
        <e type="operand" style="string">start plot point to center</e>
        <e type="operator" args="2">≡</e>
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    </math>
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    <math fractionType="none" decimalPlaces="4">
      <input>
        <e type="operand">dx</e>
        <e type="operand">H</e>
        <e type="operand">L</e>
        <e type="operator" args="2">-</e>
        <e type="operand">m</e>
        <e type="operand">1</e>
        <e type="operator" args="2">-</e>
        <e type="operator" args="2">/</e>
        <e type="operator" args="2">:</e>
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    <math optimize="2" fractionType="none" decimalPlaces="4">
      <input>
        <e type="operand">i</e>
        <e type="operand">λ</e>
        <e type="operator" args="1">-</e>
        <e type="operand">m</e>
        <e type="operand">1</e>
        <e type="operator" args="2">-</e>
        <e type="function" preserve="true" args="2">range</e>
        <e type="operand">y</e>
        <e type="operand">i</e>
        <e type="operand">λ</e>
        <e type="operand">1</e>
        <e type="operator" args="2">+</e>
        <e type="bracket">(</e>
        <e type="operator" args="2">+</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand">dx</e>
        <e type="operand">i</e>
        <e type="operator" args="2">*</e>
        <e type="function" preserve="true" args="1">erf</e>
        <e type="operator" args="2">:</e>
        <e type="function" preserve="true" args="3">for</e>
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    <text lang="ger">
      <p> y: Ausgangsdaten, mit m Punkten abgetastete        Simusfunktion   </p>
    </text>
    <text lang="fre">
      <p>y: Fonction originelle, fonction sinus,échantillon de points de m</p>
    </text>
    <text lang="eng">
      <p>y=&gt; original function, sampled at 'm' points </p>
    </text>
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        <e type="operand">f</e>
        <e type="operand">1</e>
        <e type="operand">0</e>
        <e type="operand">1</e>
        <e type="operator" args="1">-</e>
        <e type="operand">3</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="5">mat</e>
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    </math>
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        <e type="operand">f</e>
        <e type="operand">i</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operator" args="2">*</e>
        <e type="operand">y</e>
        <e type="operand">i</e>
        <e type="operand">1</e>
        <e type="operator" args="2">+</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand">y</e>
        <e type="operand">i</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>
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        <e type="operand">f</e>
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    <text lang="ger">
      <p>Die zugehörige x-Differenz ist 2 dx</p>
    </text>
    <text lang="fre">
      <p>Le pas correspondant à x est 2 dx</p>
    </text>
    <text lang="eng">
      <p>the corresponding x step is 2 dx</p>
    </text>
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      <input>
        <e type="operand">dy</e>
        <e type="operand">1</e>
        <e type="operand">2</e>
        <e type="operand">dx</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">/</e>
        <e type="operand">y</e>
        <e type="operand">f</e>
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        <e type="operator" args="2">*</e>
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    </math>
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  <region id="12" left="360" top="333" width="351" height="40" color="#000000" bgColor="#ffffff" fontSize="10">
    <text lang="ger">
      <p>dy ist eine Approximation der ersten Ableitung von y mit dem zentralen Differenzen quotienten</p>
    </text>
    <text lang="fre">
      <p>dy est une approximation de la dérivé première de yutilisant les différences centrales divisées </p>
    </text>
    <text lang="eng">
      <p>dy approximates the first derivative of y using divided central differences</p>
    </text>
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        <e type="operand">1</e>
        <e type="operator" args="2">-</e>
        <e type="function" preserve="true" args="2">range</e>
        <e type="bracket">(</e>
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        <e type="operand">fnct</e>
        <e type="operand">fnct</e>
        <e type="operand">1</e>
        <e type="operand">198</e>
        <e type="operand">1</e>
        <e type="operand">2</e>
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        <e type="function" preserve="true" args="5">submatrix</e>
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        <e type="operand">fnct</e>
        <e type="operand">Deriv</e>
        <e type="operand">2</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="4">sys</e>
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  <region id="19" left="513" top="513" width="183" height="26" color="#000000" bgColor="#ffffff" fontSize="10">
    <math fractionType="none" decimalPlaces="2">
      <input>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="1">time</e>
        <e type="operand">t0</e>
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      </input>
      <result action="numeric">
        <e type="operand">0.27</e>
        <e type="operand" style="unit">sec</e>
        <e type="operator" args="2">*</e>
      </result>
    </math>
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        <e type="operand">t0</e>
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    <math optimize="2" fractionType="none" decimalPlaces="4">
      <input>
        <e type="operand">u</e>
        <e type="operand">2</e>
        <e type="operand">dx</e>
        <e type="operator" args="2">*</e>
        <e type="operand">dy</e>
        <e type="operand">1</e>
        <e type="operand">10</e>
        <e type="operand">12</e>
        <e type="operator" args="1">-</e>
        <e type="operator" args="2">^</e>
        <e type="operand">1</e>
        <e type="operator" args="1">-</e>
        <e type="operand">3</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="5">mat</e>
        <e type="function" preserve="true" args="2">al_convr1dinv</e>
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    <text lang="ger">
      <p>Die inverse Transformation mit dem originalen Filterkern gelingt nicht,daher muss er leicht gestört werden. </p>
    </text>
    <text lang="fre">
      <p>La transformation inverse échoue à cause du filtre originel, il faut donc appliquer une petite perturbation.</p>
    </text>
    <text lang="eng">
      <p>The inverse transformation may fail with the original "f", thus a small perturbationhas to be applied. </p>
    </text>
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        <e type="operand">Int</e>
        <e type="operand">raw</e>
        <e type="operand">1</e>
        <e type="operand">m</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" preserve="true" args="5">submatrix</e>
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    <text lang="ger">
      <p>Die inverse Transformation  liefert wieder das Original, stellt also effektiv eine Integration mit der Trapezregeldar.</p>
    </text>
    <text lang="fre">
      <p>La transformation inverse donne la fonction d'origine, c'est donc effectivement une intégration en utilisant la règle trapézoïdale.</p>
    </text>
    <text lang="eng">
      <p>The inverse transformation yields  the original function,thus effectively is an integration  trapezoidal rule.</p>
    </text>
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      <input>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="1">time</e>
        <e type="operand">t0</e>
        <e type="operator" args="2">-</e>
      </input>
      <result action="numeric">
        <e type="operand">0.29</e>
        <e type="operand" style="unit">sec</e>
        <e type="operator" args="2">*</e>
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    </math>
  </region>
  <region id="28" left="27" top="1053" width="325" height="24" color="#000000" bgColor="#ffff80" fontSize="10">
    <text lang="eng">
      <p>New example, adapted and compacted jmG</p>
    </text>
  </region>
  <region id="29" left="27" top="1089" width="446" height="40" color="#000000" bgColor="#ffffff" fontSize="10">
    <text lang="ger">
      <p italic="true">$Author: mkraska $ $Date: 2014-09-02 01:09:12 +0200 (Di, 02. Sep 2014) $ </p>
    </text>
    <text lang="fre">
      <p italic="true">$Auteur : mkraska $$Date: 2014-09-02 01:09:12 +0200 (Di, 02. Sep 2014) $</p>
    </text>
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        <e type="operand" style="string">vector</e>
        <e type="operand" style="string">vector</e>
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    </math>
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        <e type="operand">x</e>
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        <e type="operand">3</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand">x</e>
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        <e type="operator" args="2">*</e>
        <e type="operand">1</e>
        <e type="operand">x</e>
        <e type="operand">x</e>
        <e type="operand">β</e>
        <e type="operand">7</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand">x</e>
        <e type="operator" args="2">*</e>
        <e type="operand">β</e>
        <e type="operand">6</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operator" args="2">+</e>
        <e type="operand">β</e>
        <e type="operand">8</e>
        <e type="function" preserve="true" args="2">el</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="operator" args="2">+</e>
        <e type="bracket">(</e>
        <e type="operator" args="2">*</e>
        <e type="operand">β</e>
        <e type="operand">5</e>
        <e type="function" preserve="true" 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="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="32" left="27" top="1350" width="177" height="44" color="#000000" bgColor="#ffff80" fontSize="10">
    <math>
      <description active="true" position="Top" lang="eng">
        <p>a pretty long expansion</p>
      </description>
      <input>
        <e type="operand">x</e>
        <e type="function" args="1">Symbolic</e>
        <e type="operand">x</e>
        <e type="function" args="1">f</e>
        <e type="bracket">(</e>
        <e type="operand">x</e>
        <e type="function" preserve="true" args="2">diff</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="33" left="27" top="1449" width="117" height="26" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">x</e>
        <e type="function" args="1">Erf</e>
        <e type="operand">x</e>
        <e type="function" preserve="true" args="1">erf</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
</regions>