matlab coder report Size mismatch (size [0 x 0] ~= size [1 x 2])

조회 수: 49 (최근 30일)
zhou caiwei
zhou caiwei . 2022년 8월 15일
댓글: Walter Roberson . 2023년 2월 13일
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?
  댓글 수: 1
Chiluveru
Chiluveru 2023년 2월 13일
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

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채택된 답변

Chunru
Chunru 2022년 8월 15일
...
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
  댓글 수: 14
zhou caiwei
zhou caiwei 2022년 8월 18일
you are right, I think I should optimize my code.Is there any reference materials?

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추가 답변 (1개)

Raghu Boggavarapu
Raghu Boggavarapu 2022년 8월 25일
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
If you wish to assign varying sized arrays to same variable, you can use coder.varize .
Also if you would like to optimize the MEX runtime, you can try disabling IntegrityChecks and ResponsivenessChecks in the MEX coder config.
  댓글 수: 3
Walter Roberson
Walter Roberson 2023년 2월 13일
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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