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I am having a problem using fmin_cobyla. I am using it to for parameter fitting. For some reason, it seems to be stuck in an infinite loop even the problem is correctly defined. I turned on iprint it is looping the following message. Does anyone know what this means ?
RESMAX,MCON, M, ICON = 0.0000000 2 1 0
ICOUNT, OPTNEW, OPTOLD, 0 NAN 0.00000
*TOT,NACT, ICON = NAN 1 2
2. VMULTD = NAN 0.000000
3. VMULTD = NAN 0.00000
3. VMULTC = 0.0000
Thanks in advance,
Andrew
I have figured out the answer. The reason for this is because rhobeg I used was a function. When rhobeg was negative, it caused it to enter an infinite loop!!!