[Ipopt] Error in GAMS with IPOPT as solver

[yanndan bronx]

Hello all,

I have a problem with IPOPT in GAMS. It is a NLP problem and can not solve it. It is written in logs :
**************************************************************************
Number of nonzeros in equality constraint Jacobian...:      234
Number of nonzeros in inequality constraint Jacobian.:        6
Number of nonzeros in Lagrangian Hessian.............:       43

Error evaluating Jacobian of equality constraints at user provided starting point.
  No scaling factors for equality constraints computed!
Error evaluating Jacobian of inequality constraints at user provided starting point.
  No scaling factors for inequality constraints computed!

Number of Iterations....: 0

Number of objective function evaluations             = 0
Number of objective gradient evaluations             = 0
Number of equality constraint evaluations            = 0
Number of inequality constraint evaluations          = 1
Number of equality constraint Jacobian evaluations   = 0
Number of inequality constraint Jacobian evaluations = 0
Number of Lagrangian Hessian evaluations             = 0
Total CPU secs in IPOPT (w/o function evaluations)   =      0.031
Total CPU secs in NLP function evaluations           =      0.000

EXIT: Invalid number in NLP function or derivative detected.
Exception of type: Eval_Error in file "../../../../GAMSlinks-trunk/Ipopt/src/Algorithm/IpOrigIpoptNLP.cpp" at line 550:
 Exception message: success && IsFiniteNumber(unscaled_c->Nrm2()) evaluated false: Error evaluating the equality constraints

EXIT: Some uncaught Ipopt exception encountered.
********************End of log***************************************

When I put GAMS option, scaleopt, to 1 there is no more complains about scale in logs but there is still the error of Ipopt/src/Algorithm/IpOrigIpoptNLP.cpp

If you have any idea, how to solve this problem, I will be grateful.


Best Regards,
Dan


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