Knitro solver

[Domagoj-Krešimir Jukić]

Hi,

I'm solving a MINLP. Currently, I'm using BONMIN which is working, but I'm trying to move to Knitro for the optimization. I have installed knitro and I have a license (the provided MATLAB examples are working). However, if I set the solver to knitro inside my CasADi problem, I get the error:

CasADi -  WARNING(".../casadi/core/plugin_interface.hpp:322: Assertion "handle!=nullptr" failed:
PluginInterface::load_plugin: Cannot load shared library 'libcasadi_nlpsol_knitro.dll':
   (
    Searched directories: 1. casadipath from GlobalOptions
                          2. CASADIPATH env var
                          3. PATH env var (Windows)
                          4. LD_LIBRARY_PATH env var (Linux)
                          5. DYLD_LIBRARY_PATH env var (osx)
    A library may be 'not found' even if the file exists:
          * library is not compatible (different compiler/bitness)
          * the dependencies are not found
   )
  Tried 'D:\MATLAB\Dispatch\PSPP - 986 LYS\casadi-windows-matlabR2016a-v3.5.5' :
    Error code (WIN32): 126
  Tried '' :
    Error code (WIN32): 126
  Tried '.' :
    Error code (WIN32): 126") [.../casadi/core/plugin_interface.hpp:171]
Error using casadi.nlpsol (line 988)
.../casadi/core/plugin_interface.hpp:417: Plugin 'knitro' is not found.

The library libcasadi_nlpsol_knitro.dll' exists and it is provided with CasADi (I'm using version v3.5.5). I assume that there is an error in the installation. Is there a step-by-step guide on how to include knitro to CasADi in MATLAB?

Thanks and greeting,

Domagoj

[Domagoj-Krešimir Jukić]

Hi,

I tried an additional solution proposed in 

https://groups.google.com/g/casadi-users/c/s67NNdSQhU0/m/pec6RrL-AQAJ

and it worked by changing the name of the .dll "knitro.dll" to "knitro1032.dll". In the newest knitro version (v13.1.0) the .dll does not contain the version name, so I assume that a simple edit of the "libcasadi_nlpsol_knitro.dll" might solve the problem for future users.

As it is a duplicate of the linked discussion, this post could also be deleted.

Greetings,

Domagoj

[Charles Khazoom]

Hi,

Did the MINLP work with knitro in Casadi ? using knitro v13.0.1, I can solve NLPs, but MINLP's don't work (does not even start solving)