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这是求解二阶微分代数方程组DAE

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            <td valign="top" width="89"><b>Author:</b></td>
            <td colspan="2"><a href="http://www.mathworks.com/matlabcentral/fileexchange/loadAuthor.do?objectType=author&amp;objectId=42203">Tony&nbsp;Roberts</a></td>
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            <td height="15" valign="top" width="89"><b>Summary:</b></td>
            <td colspan="2" height="15">A solves a set of differential algebraic <span id="__firefox-findbar-search-id" style="padding: 0pt; background-color: yellow; color: black; display: inline; font-size: inherit;">equation</span>s f(t,y,y')=0  where y'=dy/dt.</td>
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            <td height="15" valign="top" width="125"><b>MATLAB Release:</b></td>
            <td colspan="2" height="15" valign="bottom">R10</td>
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            <td valign="top" width="135"><b>Description:</b></td>
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            dae2.m solves a set of differential algebraic <span id="__firefox-findbar-search-id" style="padding: 0pt; background-color: yellow; color: black; display: inline; font-size: inherit;">equation</span>s (DAEs)<br>
<br>
f(t,y,y')=0  where y'=dy/dt<br>
 <br>
with a 2nd order method starting from y0 at time t0 and finishing at time tfin where tspan=[t0 t1 ... tfin].<br>
<br>
The method will also work well for stiff sets of ODEs.<br>
<br>
See pendrun.m, penddae.m &amp; pendg.m for a pendulum example.<br>
<br>
See dae4.m and dae4o.m for higher order accurate versions.  <br>
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              <td width="286"> <b class="feh4blk"> File Details</b></td>
              <td width="228">&nbsp;</td>
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            <td valign="top" width="25%"><b>File Id:</b></td>
            <td width="20%">28</td>
            <td valign="top" width="25%"><b>Average rating:</b></td>
            <td width="29%">3.27</td>
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            <td valign="top">&nbsp;</td>
            <td valign="top"><b>Size:</b></td>
            <td>14KB</td>
            <td valign="top"><b># of reviews:</b></td>
            <td>15</td>
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            <td valign="top">&nbsp;</td>
            <td valign="top"><b>Submitted:</b></td>
            <td>1998-09-08</td>
            <td valign="top"><b>Downloads:</b></td>
            <td>12968</td>
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            <td valign="top"><b>Subscribers:</b></td>
            <td>20</td>
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            <td valign="top"><b>Keywords:</b></td>
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                <td>&nbsp;</td>
                <td valign="top"><b>Zip file contents:</b></td>
                <td colspan="3" valign="top">dae2.m,  dae4.m,  dae4o.m,  penddae.m,  pendg.m,  pendrun.m</td>
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        <td bgcolor="#dcdfe4"><b>Date</b>: 2007-08-25<br>
          <strong>From</strong>: gabriel&nbsp;Hidalgo  <br>
          <strong>Rating</strong>:
          
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