Using AMPL Extended Functions with Global Optimization Solvers

[Pelin Kesrit]

Hello,

I am trying to use AMPL extended functions in my model. I have the following lines in my model:

load amplgsl.dll;

function gsl_cdf_beta_P;

 Since the problem is nonlinear, I need to use a global optimizer such as BARON, LINDO Global, LGO, or Couenne. But none seems to be able to call these functions. I tried following the steps listed in these previous posts:

https://groups.google.com/g/ampl/c/ytNQ1ccriLU

https://groups.google.com/g/ampl/c/aRDwT5_EBv4

( I tried downloading an older version of the amplgsl.dll and set the ampl_funclibs to the location of amplgsl.dll)

But none seemed to work and I get the following error messages respectively, for the aforementioned solvers:  

BARON does not support operation function call

BARON 25.8.5 (2025.08.05): operation not supported by BARON

BARON 25.8.5 (2025.08.05): maxtime=3600

Reading C:\Users\pelin\AppData\Local\Temp\at18472.nl in NL format

Bad NL format

Errorcode=2029: Specified feature is not yet supported or not compatible with the model type.

exit value 1

<BREAK>

LGO: timelim=3600

function gsl_cdf_beta_P not available

exit value 4

Couenne 0.5.8 -- an Open-Source solver for Mixed Integer Nonlinear Optimization

Mailing list: cou...@list.coin-or.org

Instructions: http://www.coin-or.org/Couenne

couenne: max_cpu_time=3600

exit value 18446744072635810825

<BREAK>

I would really appreciate any help on how to proceed.

Thank you!

 Pelin 

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