structure is pointlessly nested within itself when I save it. How to unnest?
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Alexei M on 16 Jun 2020
Commented: Fangjun Jiang on 17 Jun 2020
Maybe kind of a stupid question, but I had a structure saved to disk--let's call it data1.mat. My script would have a few lines like this:
data1 = load('data1.mat');
There would be a few of these. Then my script commands would access variables like this:
I edited some numbers and wanted to update the saved file data1.mat. However, now when I load the updated file, it now has an extra "layer" of "data1". So to access a variable I now need to do:
This is stupid. How can I undo this?? This should be simple but for some reason I can't figure out how to remove the pointless extra level. I tried selecting all the fields inside the structure layer and saving them to disk, but the same thing happened.
Steven Lord on 16 Jun 2020
When you save the struct that you received from load after modifying it, use the '-struct' option in your save call.
>> x = 1:10;
>> y = magic(5);
>> S = struct('x', x, 'y', y);
>> save('mymatfile.mat', '-struct', 'S');
>> whos -file mymatfile.mat
Name Size Bytes Class Attributes
x 1x10 80 double
y 5x5 200 double
More Answers (1)
Fangjun Jiang on 16 Jun 2020
If you use load() without returning a variable, then the structure won't be created, but then you have to know what variables are in the .mat file. try this:
Fangjun Jiang on 17 Jun 2020
Don't use eval. If your data comes already in a structure, no need to re-create those variables. See Steven's answer.
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