Quadratic programming hanging

Question

I'm having an issue to use the quadratic programming VI on Labview. After a long debug I found out that a sub VI called "qp_find initial feasible solution" is hanging randomically depending on the input parameters and always increasing the processing time. Some times takes some hours to stop its inner loop.
As a workaround I disabled this VI and placed a LP block to get a initial solution. It's not the best solution but now it's working like a charm. QP VI is taking 2 to 4 ms to get the solution instead of 20 ms to infinite. Actualy the LP is taking more time now then QP block. Now it's stable enough to run it on CompactRIO.
Is there another way to find a initial feaseble solution? A correction of this VI would help too.
PS.: my problem has 16 variables, 5 equality constaints and 32 parameter bounds and I'm using LV 2011 SP1.

Answer 1

I got one dataset showing the problem. I placed a "check time" VI inside the inner loop of "check feasible solution" VI to overcome the hang of the code. But it still cannot get the initial solution many times.
I'll try to get more datasets but this one shows the problem while only three variables are in use, a very simplified snapshot of the problem.
Thanks.
Attachments:
QP.vi ‏64 KB
QP cost function.vi ‏29 KB