matlab coder report Size mismatch (size [0 x 0] ~= size [1 x 2])
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I tried to use matlab coder to convert my matlab file into C\C++ source file. In my *.m file,I defined a dynamic array:
...
coord_list = [];
I_list = [];
...
for i=1:n
....
coordinate = yy;
I = zz;
coord_list = [coord_list;coordinate];
I_list = [I_list;I]
end
The error occurs like:
??? Size mismatch (size [0 x 0] ~= size [1 x 2]).
The size to the left is the size of the left-hand side of the assignment.
How could I fix this bug? how should I modify my matlab code so that It meets the requirements of C\C++ style for matlab-coder?
1 个评论
Chiluveru
2023-2-13
hi Raghu,
I am alsp facing same issue like the error below:
Size mismatch (size [1 x 0] ~= size [16 x 0]).
need your help for solving it
采纳的回答
Chunru
2022-8-15
...
coord_list = zeros(n, m1); % m1 is the length of yy below
I_list = zeros(n, m2); % m2 is the lenght of zz
...
for i=1:n
....
coordinate = yy;
I = zz;
coord_list(i, :) = coordinate;
I_list(i, :) = I;
end
14 个评论
Bruno Luong
2022-8-17
编辑:Bruno Luong
2022-8-17
Your code is too long for me to look in detail. I notice that the code is not even optimized (growing array, call function in the loop, some common calculation is repeated, some constant quantity is computed inside the loop, etc...)
My recommendation is working on your matlab code before feed it to the coder.
更多回答(1 个)
Raghu Boggavarapu
2022-8-25
Hi,
MATLAB Coder supports growing an array only by concatenation, growing an array by index is not supported. Please see: https://in.mathworks.com/help/coder/ug/limitations-with-variable-size-support-for-code-generation.html
Also if you would like to optimize the MEX runtime, you can try disabling IntegrityChecks and ResponsivenessChecks in the MEX coder config.
3 个评论
Walter Roberson
2023-2-13
You are assigning an empty array with 16 rows to a variable that was first assigned an empty array with one row.
When you use MATLAB Function Blocks in Simulink, then unless you use coder.varsize then the first assignment to a variable sets the limits on how large the variable is. This is different from regular MATLAB as regular MATLAB adjusts sizes as needed.
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