I cannot get the result from the example of the YALMIP

[wangwendi0705]

Hi Johan and everyone, Sorry for asking for help again for question that I try the example "Multiparametric Programming" in the YALMIP. The matlab code is following: `A = randn(15,3);

b = rand(15,1);

E = randn(15,2);

z = sdpvar(3,1);

x = [0.1;0.2];

F = [Az <= b+Ex];

obj = (z-1)'*(z-1);

x = sdpvar(2,1);

F = [Az <= b+Ex, -1 <= x <= 1];

[sol,diagnostics,aux,Valuefunction,OptimalSolution] = solvemp(F,obj,[],x);

plot(Valuefunction);

figure

plot(OptimalSolution(1)); ` The code does not work. And I just get two empty figure. Thanks!

[johanlofberg]

Hence I guess MPT does not work on your machine, which you will have to check by solving problems without YALMIP, and/or debug the call to MPT in solvemp and see what happens in MPT and understand why it fails

[wangwendi0705]

Thanks for fast reply. But without YALMIP, the commad 'sdpvar' does not work. And without YALMIP, I don't know how to debug the call to MPT in solvemp. Forgive my stupidity and thanks for help.

[johanlofberg]

I am saying you should go completely without YALMIP and call MPT directly, such as testing its examples

[johanlofberg]

nor have you told us what the returned diagnostic code is. my guess is solver not found

[wangwendi0705]

The returned diagnostic code is Unknown problem (< a href=" ">learn to debug</ a>) (Unknown problem (< a href="yalmip.github.io/tutorial/inside/debug">learn to debug</ a>) (use the non-existent field 'requested_variables'。))

[wangwendi0705]

I test several MPT examples without YALMIP just now and it does work. I guess something wrong with my command solvemp.

[wangwendi0705]

I also use the code 'yalmiptest'. And I find the MPT solver is installed.

[johanlofberg]

It appears to be a bug in the develop branch, so you will have to switch back to the master branch

[wangwendi0705]

Sorry. I cannot understand how to switch back to the master branch.

[johanlofberg]

Well, somehow you have managed to install the develop branch instead of the master branch. If you don't know how to switch, simply uninstall yalmip and install it again, as the default public version is the master branch

[wangwendi0705]

Thank you very much. I try to install the YALMIP again. Sorry that I've been bothering you for too long

[johanlofberg]

Fixed in #1217