[Csdp] Error code 8: System matrix is singular

[Brian Borchers]

At each iteration of the primal-dual interior point method, a large, dense,
symmetric and positive definite system of equations is solved to obtain the
steps deltaX, deltay, and deltaZ.  When this error case occurs, it
indicates that this system of equations is singular and can't be solved.

This could be the result of a bug in CSDP or a problem with the formulation
of your SDP.  If you would be willing to send me a copy of the problem on
which this error occurs, I'd be happy to investigate the cause.

On Thu, Dec 4, 2014 at 3:59 PM, <markisus at gmail.com> wrote:

>  What does this error mean? Which matrix is the system matrix and why
> would singularity be a problem?
>
> If it helps, here is my input file:
> http://pastebin.com/ite3C1Vz
>
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>


-- 
Brian Borchers                          borchers at nmt.edu
Department of Mathematics      http://www.nmt.edu/~borchers/
New Mexico Tech                       Phone: (575) 322-2592
Socorro, NM 87801                   FAX: (575) 835-5366
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