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

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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 Commento
Stephen23
Stephen23 il 23 Lug 2021
Rather than using evil EVAL, it is simpler, more efficient, and much more robust to use dynamic fieldnames:
test = struct();
for k = 1:100
fld = sprintf('p%d',k);
test.(fld) = 1:1:2e5;
end
save('test.mat','-v7.3','-struct','test');

Accedi per commentare.

Risposta accettata

Stephen
Stephen il 14 Set 2018
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.

Più risposte (1)

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

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