'Solver not found (gurobi)'

[Ali Khudhair]

Dear respected professor,
I just installed "Gurobi" solver successfully(academic version), but when I use it :
solvesdp(LMIs,gamma_inf,sdpsettings('solver','gurobi','verbose',0))

I get the following :
solvertime: 0
          info: 'Solver not found (gurobi)'
       problem: -3
    yalmiptime: 0.106

Could you please give me some hints to overcome this problem. Thank you in advance for your time.

Regards,
Ali

[Johan Löfberg]

You've installed the wrong version (linus/win etc) or you haven't added the path to the binaries in matlab. Run

>> which gurobi -all
 

and it will be clear

[Ali Khudhair]

Thank you professor for your fast response, I added the path now, I am receiving the following:
solvertime: 0
          info: 'Solver not applicable (gurobi)'
       problem: -4
    yalmiptime: 0.111

 

[Johan Löfberg]

Well, based on the name of your constraint, it looks like you are trying to solve a semidefinite program. Gurobi is not an sdp solver.

[Ali Khudhair]

That is right, Thank you professor.

[Ali Khudhair]

Dear professor,

I am trying to synthesize output-feedback gain scheduling controller (H-infinty) using ROLMIP. When I use SeDuMi, I always get "Numerical problem" :
 yalmiptime: 0.151
    solvertime: 11.726
          info: 'Numerical problems (SeDuMi-1.3)'
       problem: 4

I have tried to switch to another solver SDPT3 but the same thing happen "Lack of Progress".  Then I tried Gurobi but as you mentioned this is not good for sdp.
Is there any suggestions to get rid of this numerical problem.

[Johan Löfberg]

Bad data or bad model.