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<div>I have posted this question to cs.stackexchange.com but then I thought maybe this mailing list is the better audience. I am new to CSDP and SDPs in general, so I’m not sure if my problem is a misunderstanding of SDPs or the software CSDP. CSDP is telling me that my problem is dual infeasible, even though setting all variables to 0 should provide a feasible solution. This is because I only have two constraints, L1 = 0 and L2 = 0, where L1 and L2 are linear functions of my variables Xij. </div><div><br></div><div>Here is my program in SPDA format, where I am focusing on the dual problem:</div><div><br></div><div> 2<br> 1<br> 11<br> 0.0 0.0<br> 0 1 1 10 1.0<br> 1 1 1 10 .25<br> 1 1 3 10 .25<br> 1 1 6 10 -.25<br> 1 1 8 10 -.25<br> 1 1 9 10 -.5<br> 2 1 2 11 -3.0<br> 2 1 3 11 -4.0<br> 2 1 4 11 1.0<br> 2 1 5 11 1.0<br> 2 1 6 11 -4.0<br> 2 1 7 11 3.0<br> 2 1 9 11 1.0</div><div><br></div><div><br></div><div>Below is a link to my stackexchange post:</div><div><a href="http://cs.stackexchange.com/questions/33478/why-would-this-semidefinite-program-be-dual-infeasible" target="_parent">http://cs.stackexchange.com/questions/33478/why-would-this-semidefinite-program-be-dual-infeasible</a></div><span style='font: 14px/19.6px "Helvetica Neue", Arial, sans-serif; text-align: left; color: rgb(17, 17, 17); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; float: none; display: inline !important; white-space: normal; background-color: rgb(253, 253, 253); -webkit-text-stroke-width: 0px;'><div><br></div><div><br></div><p style='font: 14px/19.6px "Helvetica Neue", Arial, sans-serif; margin: 0px 0px 1em; padding: 0px; border: 0px black; border-image: none; text-align: left; color: rgb(17, 17, 17); text-transform: none; text-indent: 0px; letter-spacing: normal; clear: both; word-spacing: 0px; vertical-align: baseline; white-space: normal; background-color: rgb(253, 253, 253); -webkit-text-stroke-width: 0px;'><span class="Apple-converted-space"></span><br></p></span><div><br></div>
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