gurobi solver not detected

[Ayub Afridi]

hello dear johan, i have installed gurobi9.1 in my pc and i have already added its path to matlab and sytem variables, but once i select the solver gurobi in yalmip model, it says no solver found

[Johan Löfberg]

You don't have it in your path, or you have installed the wrong binary

>> addpath(genpath('C:\gurobi912\win64'))

>> which gurobi -all

C:\gurobi912\win64\matlab\gurobi.mexw64

C:\gurobi912\win64\matlab\gurobi.m       % Shadowed

[Ayub Afridi]

i have tried the steps that you have mentioned, still it shows NaN result now

i am using a simple YALMIP model just to test my solver, for cplex it is working and showing correct results, but no other solver is detected

specailly gurobi 

[Johan Löfberg]

Prove it. Show that you add it to your path as above, make a dir of that directory to show us that you actually added the correct path, then show what you get when you search for it (and for extra credit, how us what binary your system is using by running mexext too), and finally solve a small problem and show that you really get the solver not found flag

[Ayub Afridi]

okay, i have take some pictures from the path of MATLAB, and also the command that you have provided me to run into matlab to add gurobi.

please have a look, i have attached a zip file so inisde are 3 pictures

[Johan Löfberg]

YALMIP has no issue finding gurobi here, so your claim about it missing is not correct.

I would guess you aren't looking at the diagnostic output thus failing to see complaints about missing licenses or unexpected crashes, or that you simply try to solve an infeasible prolem or something like that. Don't send pictures, simply copy the output

>> sdpvar x

>> optimize(x>=0,x,sdpsettings('solver','gurobi'))

ans = 

  struct with fields:

    yalmipversion: '20210331'

    matlabversion: '9.9.0.1524771 (R2020b) Update 2'

       yalmiptime: 0.5143

       solvertime: 0.1817

             info: 'Successfully solved (GUROBI)'

          problem: 0

[Ayub Afridi]

yalmipversion: '20210331'

    matlabversion: '9.0.0.341360 (R2016a)'

       yalmiptime: NaN

       solvertime: NaN

             info: 'Unknown problem in solver (Turn on 'debug' in sdpsettings) (Invalid MEX-file 'C:\gurobi912\win6…'

          problem: 9

[Johan Löfberg]

as it says in the info (turn on debug and you will see it printed clearly): you have installed the wrong version or something, as it complains about the mex file

[Johan Löfberg]

the only way to get that error if you have the wrong version

>> which gurobi -all

C:\gurobi912\win64\matlab\gurobi.mexw64

C:\gurobi912\win64\matlab\gurobi.m       % Shadowed

>> mexext

mexw64

or if your windows path isn't correctly setup

>> s = evalc('!path');

>> ~isempty(strfind(s,'C:\gurobi912\win64\bin'))

ans =

  logical

   1

onsdag 9 juni 2021 kl. 13:49:21 UTC+2 skrev ayubaf...@gmail.com:

[Ayub Afridi]

this is logical answer i get, the version of yalmip, matlab and gurobi is mentioned in above message

>> which gurobi -all

C:\gurobi912\win64\matlab\gurobi.mexw64

C:\gurobi912\win64\matlab\gurobi.m       % Shadowed

>> mexext

mexw64

>> s = evalc('!path');

>> ~isempty(strfind(s,'C:\gurobi912\win64\bin'))

ans =

     0

[Johan Löfberg]

so you have failed to add the path to windows. back to the gurobi installation notes (or restart since I think that is required after installing gurobi, but then it told you that)

i.e. not a yalmip or matlab issue, but a failed gurobi installation

[Ayub Afridi]

thank you very much i understood your point of view, you are doing alot help to me. actually i tested the installation according to the notes, but i will make sure again what actually the problem is, gurobi test shows the proper installation but here i think it might be the compatability issue?

[Johan Löfberg]

no it is simply a missing environment variable in windows

you can easily test that by going to the directory and then run our code, and gurobi will work

>>cd('C:\gurobi912\win64\bin')