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