Is their any way to load only selected fields from a saved structure array.
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Bonnie Tyler on 15 Feb 2017
Commented: Walter Roberson on 15 Feb 2017
I have some very large structure arrays stored in .mat files. I want to avoid loading the entire array to save time and memory.
Stephen23 on 15 Feb 2017
Edited: Stephen23 on 15 Feb 2017
Make sure you save the structure array using the '-struct' option:
And then, exactly as the load documentation says, you can load the variables by supplying their names as optional arguments. E.g. if the mat file contains variables X and Y:
S = load(filename,'X','Y');
This will only load X and Y into the structure S, not matter what other variables are also present in the mat file.
>> S.X = 1:3;
>> S.Y = 4:5;
>> S.Z = 6:9;
>> S = load('test.mat','X','Y');
However, if they are structure arrays rather than scalar structures, then you cannot use save -struct
Sorry there is no Mathworks provided way to do that.
If you just happen to be using a v7.3 mat file then I wonder if there would be an approach by using hdf5 routines to access the mat file?
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