Trying to use glpk

[john]

Hi

I have just downloaded Pyomo and was able to solve optimization problems using the Neos solvers.

However when I try to use glpk using the command:

pyomo solve --solver=glpk diet1.py diet.dat

I get the following errors:

C:\Users\john\Home\RnD\src\Python\PyomoWorx>pyomo solve --solver=glpk diet1.py diet.dat
[    0.00] Setting up Pyomo environment
[    0.00] Applying Pyomo preprocessing actions
[    0.02] Creating model
[    0.08] Applying solver
WARNING: "[base]\site-packages\pyomo\solvers\plugins\solvers\GLPK_old.py", 68, executable
        Could not locate the 'glpsol' executable, which is required for solver 'glpk'
[    0.09] Pyomo Finished
ERROR: Unexpected exception while running model:
        No executable found for solver 'glpk'

I have installed the the glpk packages using the winglpk from the url: http://winglpk.sourceforge.net/

I have also added the executables (which exist in the subdirectory w64) to the PATH.

In particular, I have added "C:\Packages\winglpk-4.55\glpk-4.55\w64\" to the PATH.

Any suggestions/advice which will help me to use glpk solver will be appreciated.

Many thanks!

[David Woodruff]

take a look at the video posted in the blog section of pyomo.org that talks about how to know when glpk is not installed correctly.

  Dave

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[john]

Thanks! It works well no :)

[SIDDHARTHA PAUL]

You can install GLPK manually as shown in

https://stackoverflow.com/questions/20690195/how-do-you-install-glpk-solver-along-with-pyomo-in-winpython

[David Woodruff]

That's good advice. If you want to check your installation, here is a video that may only annoy you because it helps you see if you have *not* installed correctly (but sometimes that is nice to know):

 http://dlwoodruff.ucdavis.edu/badGLPK.mp4

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