Solver glpk is installed but not working properly

[Teresa]

Hi all,

Whenever I try to use the solver glpk, there is an error which says:

>> changeCobraSolver('glpk','LP')
 > changeCobraSolver: Solver glpk is installed but not working properly.

ans =

  logical

   0

Also when I try to do the test with glpk the answer is:

>> glpktest1
LP problem
Undefined function or variable 'glpkcc'.

Error in glpk (line 508)
[xopt, fmin, status, extra] = glpkcc(c, a, b, lb, ub, ctype, vartype, sense, param);

Error in glpktest1 (line 21)
[xmin,fmin,status,extra]=glpk(c,a,b,lb,ub,ctype,vartype,s,param)
 
>> glpktest2
-- Integer problem --
Undefined function or variable 'glpkcc'.

Error in glpk (line 508)
[xopt, fmin, status, extra] = glpkcc(c, a, b, lb, ub, ctype, vartype, sense, param);

Error in glpktest2 (line 12)
[xmin,fmin,status,extra]=glpk(c,a,b,lb,ub,ctype,vartype,s,param)

I already reinstalled the cobratoolbox and tried to solve the problem.

I already tried to install glpkmex in matlab with following script:

>> makeglpkmex
GLPKMEX - A Matlab interface for GLPK. Script installer.
Version 2.7 compatible with GLPK 4.36 (or higher)
(C) 2001-2007, Nicolo' Giorgetti.
Maintained by  Niels Klitogrd
Last updated: Dec 2009.
Do you want to use graphic installer? Y/N [Y]: Y
GLPK path... C:\Program Files\MATLAB\R2019a\toolbox\cobratoolbox-master\cobratoolbox-master\external\base\solvers\glpkmex
Error using dir
Name must be a string scalar or character vector.

Error in makeglpkmex (line 58)
   d=dir(include);
 

I also already tried to install glpk manually, however then the same error occur in matlab.

Can someone give me an advise how to handle this problem?

Thanks for your help.

Regards,

Teresa

[Ronan M.T. Fleming]

Hi,
what is the result of

[solverOK, solverInstalled] = changeCobraSolver('glpk', 'LP', 1, 2)

Regards,

Ronan

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[Teresa]

Hi Ronan,

thanks for your answer.

This is the result:

>> [solverOK, solverInstalled] = changeCobraSolver('glpk', 'LP', 1, 2)

 > The solver compatibility is not tested with MATLAB R2019a.
Undefined function 'glpkcc' for input arguments of type 'struct'.

solverOK =

  logical

   0

solverInstalled =

  logical

   1

[Ronan M.T. Fleming]

Hi
somehow it cannot find the path to glpk

>> which glpkcc

should return something like

/fork-cobratoolbox/binary/maci64/bin/glpkcc.mexmaci64

That is for a mac. It is similar for other os. Check the contents of
the binary folder.

Regards,

Ronan

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[Teresa]

I checked the folder and this folder was empty. That´s why I downloaded this folder again and now it works.

Thank you for your help. I think some folders are empty somehow, this was the same for the folder test and tutorial.

This are now my results:

>> changeCobraSolver('glpk','LP')

 > The solver compatibility is not tested with MATLAB R2019a.

ans =

  logical

   1

>> glpktest1
LP problem
Writing problem data to `SimpleLP.mps'...
24 records were written
Original LP has 3 rows, 3 columns, 9 non-zeros
Presolved LP has 3 rows, 3 columns, 9 non-zeros
Scaling...
 A: min|aij| = 1.000e+000  max|aij| = 1.000e+001  ratio = 1.000e+001
Problem data seem to be well scaled
Constructing initial basis...
Size of triangular part = 3
*     0: obj =  0.000000000e+000  infeas = 0.000e+000 (0)
*     2: obj =  7.333333333e+002  infeas = 0.000e+000 (0)
OPTIMAL SOLUTION FOUND

xmin =

   33.3333
   66.6667
         0

fmin =

  733.3333

status =

     5

extra =

  struct with fields:

      lambda: [3×1 double]
    redcosts: [3×1 double]
        time: 0
      memory: 44.2051

>>

Thank you for your help!!!