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Attempt to extract field 'iterations' from 'mxArray'

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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?

Risposta accettata

Grek Vardugin
Grek Vardugin il 11 Nov 2018
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));

Più risposte (1)

Joh Hag
Joh Hag il 26 Ott 2018
hi, is output a struct? the mxArray is just the bare data and does not have such a field. have you tried to put the value in a separate variable such num_iterations = output.iterations? and then use this one in the fprintf command. this could help codegen to sort things out.
  3 Commenti
Joh Hag
Joh Hag il 26 Ott 2018
Did you try the trick with the temporary variable? where does the compilation actually fail? at the fprintf's or when you call linprog?
Grek Vardugin
Grek Vardugin il 26 Ott 2018
Compilation failed then I use fprintf. If I use the disp function instead of fprintf, I get a similar error.

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