Help on User Defined Function
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I'm Getting this Could not determine the size of this expression. error in a very simple function, if someone can check it out and give me a hint, I would appreciate it.
The code is this:
function subPortadora = codigos(txSig,i)
%#codegen
temp = complex(zeros(15,1));
if i < 512
if i==0
temp = txSig(1:15,1);
else
temp = txSig(i*15+1:15*(i+1),1);
end
end
subPortadora = temp;
Thanks in Advance
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Réponses (2)
Nathan
le 13 Août 2014
Modifié(e) : Nathan
le 13 Août 2014
Why don't you just simply replace your call to codigos with:
txSig(i*15+1:15*(i+1),1)
This will still return a column vector pulled from txSig. My solution assumes that i>=0 & i<513 and is an integer.
Alternatively, if you do need the funciton check out this link with what appears to be the same problem: http://www.mathworks.com/matlabcentral/answers/92878-why-does-embedded-matlab-fail-to-detemrine-the-size-of-my-expression-in-simulink-7-2-r2008b
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Mike Hosea
le 19 Sep 2014
Sorry we missed this question. The problem is that colon expression lengths are tricky business in MATLAB because the end point of a:b:c is not required to equal a + n*b for any integer n, and the situation is even more complicated with non-integer or extremely large values when there can also be round-off error. Try replacing
temp = txSig(i*15+1:15*(i+1),1);
with
temp = txSig(i*15+(1:15),1);
The latter makes it crystal clear that the indexing expression is 15 elements long. You shouldn't need the if/else, as that should work perfectly when i == 0.
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