save problem: -STRUCT must be the name of a scalar structure variable

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Yu Li
Yu Li 2018-9-14
评论： Stephen23 2021-7-23
I generated a struct file and tried to save it, but Matlab occurs error: The argument to -STRUCT must be the name of a scalar structure variable.
Below are the test code:
for i=1:1:100
fprintf('%0dth data.\n',i)
eval(['test.p',num2str(i),'=1:1:2e5;'])
end
save('test.mat','-v7.3','-struct','S');
is there any problem with my code?
Thanks!
Yu
  1 个评论
Stephen23
Stephen23 2021-7-23
Rather than using evil EVAL, it is simpler, more efficient, and much more robust to use dynamic fieldnames:
https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html
test = struct();
for k = 1:100
fld = sprintf('p%d',k);
test.(fld) = 1:1:2e5;
end
save('test.mat','-v7.3','-struct','test');

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采纳的回答

Stephen
Stephen 2018-9-14
It is unclear from your post what the data type of variable "S" is. But the error is telling you that "S" is NOT a structure. You can either:
1) Change "S" to a structure variable containing the data you want to save.
or
2) Remove the '-struct' argument from the save command.

更多回答（1 个）

埃博拉酱
埃博拉酱 2021-7-23
save(filename,'-fromStruct',test);

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