Attempt to extract field 'iterations' from 'mxArray'

Question

Grek Vardugin 2018-10-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/426304-attempt-to-extract-field-iterations-from-mxarray

回答： Grek Vardugin 2018-11-11

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?

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Answer 1

Grek Vardugin 2018-11-11

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https://ww2.mathworks.cn/matlabcentral/answers/426304-attempt-to-extract-field-iterations-from-mxarray#answer_346321

在 MATLAB Online 中打开

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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Answer 2

Joh Hag 2018-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/426304-attempt-to-extract-field-iterations-from-mxarray#answer_343619

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.