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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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5<meta http-equiv="Content-Language" content="en-us">
6<title>YALMIP FAQ</title>
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18<table border="1" cellpadding="4" cellspacing="3" style="border-collapse: collapse" bordercolor="#000000" width="100%" align="left" height="100%">
19  <tr>
20    <td width="100%" align="left" height="100%" valign="top">
21    <h2>Frequently asked question (and more)</h2>
22    <hr noShade SIZE="1">       
23    <p><b><font color="#0000FF">Q:</font></b> I've been using a previous version
24    of YALMIP, but after installing the new version nothing works.<br>
25    <b><font color="#0000FF">A:</font></b> Restart Matlab.</p>
26    <p><b><font color="#0000FF">Q:</font></b> ...still doesn't work!<br>
27    <b><font color="#0000FF">A:</font></b> Added all the paths? (<i>/yalmip</i>,
28    <i>/yalmip/extras, /yalmip/sos, /yalmip/demos, /yalmip/solvers</i>)</p>
29    <p><b><font color="#0000FF">Q:</font></b> My version of
30    <a href="solvers.htm#sdpt3">SDPT3</a>-3.02 does not work with
31    YALMIP<br>
32    <b><font color="#0000FF">A:</font></b> Download <a href="solvers.htm#sdpt3">SDPT3</a>-3.02 and compile (code
33    updated without version increment)</p>
34    <p><b><font color="#0000FF">Q:</font></b> <a href="solvers.htm#sdpt3">SDPT3</a> (or
35    <a href="solvers.htm#sedumi">SeDuMi</a>) does not work<b><font color="#0000FF">.<br>
36    A:</font></b> Make sure not to have both <a href="solvers.htm#sdpt3">SDPT3</a> and
37    <a href="solvers.htm#sedumi">SeDuMi</a> on the Matlab path</p>
38    <p><b><font color="#0000FF">Q:</font></b> <a href="solvers.htm#csdp">CSDP</a> does not work<b><font color="#0000FF">.<br>
39    A:</font></b> Do you have <a href="solvers.htm#csdp">CSDP</a> in your <i>system</i> path?</p>
40    <p><b><font color="#0000FF">Q:</font></b> It is soo slow!<br>
41    <b><font color="#0000FF">A:</font></b> Running on LINUX with YALMIP chucked
42    away somewhere on a network? Yep, I know...</p>
43    <p><b><font color="#0000FF">Q:</font></b> I already have
44    <a href="solvers.htm#lmilab">LMILAB</a> and <a href="solvers.htm#linprog">LINPROG</a> 
45    installed, do I need any other solver?<br>
46    <font color="#0000FF"><b>A:</b></font> Yes, at-least if you intend to solve
47    anything but a few small problems.</p>
48    <p><b><font color="#0000FF">Q:</font></b> There are soo many solvers, which
49    one should I use?<br>
50    <font color="#0000FF"><b>A:</b></font> <a href="solvers.htm#sedumi">SeDuMi</a> is a good general purpose SDP
51    solver, with binaries available for most platforms. (not necessarily the
52    best solver though)</p>
53    <p><b><font color="#0000FF">Q:</font></b> Are  inequalities really
54    strict?<br>
55    <font color="#0000FF"><b>A:</b></font> There is no distinction in YALMIP
56    between strict or non-strict inequalities. How the inequality is treated
57    (strict or non-strict) depends on the solver.</p>
58    <p><b><font color="#0000FF">Q:</font></b> I can't write <code>X(end)</code> 
59    when <code>X</code> is an
60    <a target="topic" href="file:///C:/Dokumente%20und%20Einstellungen/Johan%20L&ouml;fberg/Eigene%20Dateien/My%20Webs/myweb9/htmldata/reference.htm#sdpvar">
61    sdpvar</a>-matrix<br>
62    <font color="#0000FF"><b>A:</b></font> Use 2 arguments, for example <code>
63    X(1,end)</code> or <code>X(end,1)</code>.</p>
64    <p><b><font color="#0000FF">Q:</font></b> Why can't I write <code>X =
65    eye(2); X(1,1)=sdpvar(1,1)</code>?<br>
66    <font color="#0000FF"><b>A:</b></font> Work in progress, seems to be a bug
67    in Matlab.</p>
68    <p><b><font color="#0000FF">Q:</font></b> I have found a bug, what to do?<font color="#0000FF"><b><br>
69    A:</b></font> Send a mail to <a href="mailto:loefberg@control.ee.ethz.ch">
70    loefberg@control.ee.ethz.ch</a>. Type <code>ver</code> in Matlab and include
71    the result in the mail. If possible, include the code (as simple as
72    possible) that generated the fault, otherwise, include at-least the error
73    message etc. The more information the better.</p>
74    <p><b><font color="#0000FF">Q:</font></b> I have an idea for a new feature,
75    what to do?<font color="#0000FF"><b><br>
76    A:</b></font> Send a mail to <a href="mailto:loefberg@control.ee.ethz.ch">
77    loefberg@control.ee.ethz.ch</a>. However, I only add new features when I
78    need them my self, but if your idea is good enough, I might realize that I
79    need it.</p>
80    <p><b><font color="#0000FF">Q:</font></b> What does YALMIP mean?<b><font color="#0000FF"><br>
81    A:</font></b> Used to be short for Yet Another LMI Parser. However, since
82    YALMIP is much more than a LMI parser now, it dies not mean anything more.
83    Perhaps Yet Another Lame Modeling Initiative.</p>
84    <p><b><font color="#0000FF">Q:</font></b> Defining bilinear matrix
85    inequalities using the command lmi and solving LPs with a command called
86    solvesdp, kind'a weird if you ask me!<b><font color="#0000FF"><br>
87    A:</font></b> Yes...These names are kept or backwards compability. Hence the
88    command lmi does not mean Linear Matrix Inequalitiy, but List of Matrix
89    Inequalities and solvesdp is short for solve symbolic decision problem. Or
90    what ever you want them to mean.</p>
91    </td>
92  </tr>
93</table>
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95</div>
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