"Structure field undefined on some execution paths" error when copying data between cell arrays
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I am trying to generate C code for a simple function with MATLAB Coder. This function defines a structure "out" and includes the following code:
if ~isempty(data)
date=cell(length(data),1);
for i=1:length(data)
date{i,1} = data{i,1};
end
out.date=date;
end
I get the following error message during code generation runtime issue check stage:
"Structure field 'out.date{:}' is undefined on some execution paths."
My function is written in a way such that this field should always be defined. Why is this error occurring, and how can I work around it?
采纳的回答
MathWorks Support Team
2026-1-29
编辑：MathWorks Support Team
2026-1-30
This error can be resolved by always assigning the variable "out.date", even when data is empty. When data is empty, you should assign "out.date" to a default value, such as an empty cell array. When data is not empty, assign it as usual. Additionally, for better compatibility with MATLAB Coder, it is recommended to store "length(data)" in a variable before using it in a loop. Here is how you can structure your code:
if ~isempty(data) N = length(data); date = cell(N,1); for i = 1:N date{i,1} = data{i,1}; end out.date = date;else out.date = cell(0,1);end
1 个评论
Walter Roberson
2026-1-22
Isn't the real problem that out.date is not defined in the case where isempty(data) ?
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