Error - 'All inputs must be constant' in MATLAB Coder
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Puneet Khurana
on 26 Dec 2017
Commented: Walter Roberson
on 27 Dec 2017
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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Accepted Answer
Walter Roberson
on 26 Dec 2017
if k==3
trellis = poly2trellis(3,[5,7]);
elseif k==4
And so on.
5 Comments
Walter Roberson
on 27 Dec 2017
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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