Assertion failed error

Hello. I have a problem of using CVX to solve a convex problem. Sometimes, the error occurs below:

Error using findblks
Assertion failed (k < bsize) at line 181 of file ‘sdmauxCmp.c’.

Stack trace:
[ 0] 0x01d6d33a F:\Program Files\MATLAB\R2013a\bin\win32\libmwfl.dll+00054074
fl::diag::stacktrace_base::rend+00000586
[ 1] 0x01d6d812 F:\Program Files\MATLAB\R2013a\bin\win32\libmwfl.dll+00055314
fl::diag::stacktrace_base::stacktrace_base+00000034
[ 2] 0x73dcbeac F:\Program Files\MATLAB\R2013a\bin\win32\libmex.dll+00048812 mexPrintAssertion+00000620
[ 3] 0x05c22637 c:\documents and settings\yan\work\2012paper\201308\201306code\sedumi\findblks.mexw32+00009783
[ 4] 0x05c21215 c:\documents and settings\yan\work\2012paper\201308\201306code\sedumi\findblks.mexw32+00004629

Thanks for u attention. Best wishes!

This is actually a bug in SeDuMi, not in CVX itself. What happens if you try the other solver, SDPT3? That is, insert

cvx_solver sdpt3

in your code and see what happens.

If you’re interested in helping debug SeDuMi, please submit a bug report on the SeDuMi issues page, preferably with enough data to reproduce you model. You are welcome to include CVX models in that bug report.

Thanks for your suggestion, I will try that. I notice that the sdpt solver is already inclued in the CVX package. But I am not sure which one is more powerful, sedumi or sdpt3?

They both solve the same set of problems. Sometimes one will be better than the other. SeDuMi is typically faster, but even that isn’t always true.