ERROR: Wavelet + MATLAB Coder

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Nycholas Maia
Nycholas Maia 2018-5-1
评论： Nycholas Maia 2018-5-23
I'm trying to convert my function called myFunc to C. The 'signal' input argument is a vector (1000, 1) that contains only uint16 numbers.
function [out] = myFunc(signal)
[c,l] = wavedec(signal, 8, 'db8');
[out] = detcoef(c,l, 4);
end
When I tried to convert this MATLAB function to a C function, I got a error inside the: wavedec.m - Line 29
This assignment writes a 'double' value into a 'single' type. Code generation does not support changing types through assignment. Check preceding assignments or input type specifications for type mismatches.
Line 29:
c = zeros(0,1);
When I put my mouse over the 'c' variable on the error window, MATLAB shows me that this 'c' variable is single type and 'zeros(0, 1)' return a double type.
Could you please help me to convert this function to a C file?

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回答（1 个）

Arnab De
Arnab De 2018-5-9
There must be other assignments to the variable 'c' where the assigned value is single. If you want 'c' to be single, change the line 29 to
c = zeros(0,1,'single');
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Arnab De
Arnab De 2018-5-22
Ah! My bad. Can you please post the codegen command you are using? According to the doc (https://www.mathworks.com/help/wavelet/ref/wavedec.html), signal should be double vector.
Nycholas Maia
Nycholas Maia 2018-5-23
Yes, the signal input argument is already double.
I'm not using codegen by command window. I'm using MATLAB Coder app (GUI), so I don't have the codegen command.
Do you have any idea?

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