MATLAB: Attempt to extract field ‘iterations’ from ‘mxArray’

codegenlinprogMATLABmex

Hello! I need help. My problem is in Title. I use codegen for translate .m-code in mex.
    [xopt,zmin,exitflag,output,lambda] = linprog(C1,A,B,[],[],LB1,[],[],options);
    fprintf(1,Out1,xopt,zmin);
    fprintf(1,'ExitFlag= %d\nIterats= %d\n',exitflag,output.iterations);
How can I solve this problem?

Best Answer

I solve it. First, I created a new structure with fields that exist in the output structure.
output = struct('iterations', 0, 'constrviolation', 0, 'message', '', 'algorithm', '', 'firstorderopt', 0);
Then I added the coder.varsize function for text fields.
coder.varsize('output.message', [1,100]);
coder.varsize('output.algorithm', [1,100]);
After
[xopt,zmin,exitflag,output,lambda] = linprog(C,A,B,Aeq,Beq,lb,ub,[],options);
fprintf(1,Out1,xopt,zmin);
fprintf(1,'\nExitFlag = %d\nIterats = %d\n',exitflag,num2str(output.iterations));
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