extract coloumns from .mat file
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I have a .mat file which consist of a 22253519x5 double. I need to extract first three coloums only and save them in another .mat file having 2253519x3 double data. All the rows are to be considered.
I have no clue about this. New to MATLAB. Any help would be appreciated.
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Accepted Answer
Walter Roberson
on 29 May 2018
The below would be easier if you only had one variable stored in the .mat file and you knew the name of the variable. The below code does not assume that there is only one variable and does not assume that the variables have any particular names; the code takes the first three columns of all of the variables that are present, and creates the new .mat file using all of the same variable names.
filename = 'YourFile.mat';
newfile = 'YourNewFile.mat';
datastruct = load(filename);
newstruct = structfun(@(M) M(:,1:3), datastruct, 'uniform', 0);
save(newfile, 'newstruct', '-struct');
6 Comments
Walter Roberson
on 1 Jun 2018
What is a c/h file ?
>> some_variable = rand(22253519,5);
>> save('YourFile.mat', 'some_variable');
>> filename = 'YourFile.mat';
newfile = 'YourNewFile.mat';
datastruct = load(filename);
newstruct = structfun(@(M) M(:,1:3), datastruct, 'uniform', 0);
>> save(newfile,'-struct','newstruct')
>> whos -file YourNewFile.mat
Name Size Bytes Class Attributes
some_variable 22253519x3 534084456 double
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