Error - 'All inputs must be constant' in MATLAB Coder

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Puneet Khurana 2017-12-26

1
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https://ww2.mathworks.cn/matlabcentral/answers/374533-error-all-inputs-must-be-constant-in-matlab-coder

评论： Walter Roberson 2017-12-27

I am trying to convert the function poly2trellis into C using MATLAB Coder. The problem arise when I check the issues in the Coder App and it displays the error that ' all inputs must be constant'.

function [ trellis ] = con_poly2trellis(k) %#codegen
generator_matrix=[0 0];
if k==3
  generator_matrix=[5 7];
else
  generator_matrix=[32 35];
end
trellis = poly2trellis(k,generator_matrix);
end

Does it mean that I can generate code for a single specific input and not based on any value passed for 'k'?

What if a generic function is required which can accept any value of 'k' and I can include multiple if-else case for generator_matrix?

Please help and suggest.

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采纳的回答

Walter Roberson 2017-12-26

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/374533-error-all-inputs-must-be-constant-in-matlab-coder#answer_297737

在 MATLAB Online 中打开

if k==3
  trellis = poly2trellis(3,[5,7]);
elseif k==4

And so on.

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Puneet Khurana 2017-12-27

got it, thanks!!

Walter Roberson 2017-12-27

It does not execute all of the function calls, it compiles all of the function calls down into the specific code needed for that one trellis variety.

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