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save variables in .mat files with desired name.

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Sunil  Shahi
Sunil Shahi on 11 Aug 2013
Commented: Eleanna Kritikaki on 28 Jan 2020
I have a function where I do my calculation to get A cell or array. Now I want to save this array in a .mat file but I want to change the variable name.
myData = [1 2 3 4 5 6 7 8 9]; %data from my calculation
save Data.mat myData
This saves my data in Data.mat file but with variable name myData. Now I want to save values of myData in .mat file but I want to save the value under a variable name given via input function. Something like:
myData = [1 2 3 4 5 6 7 8 9]; %data from my calculation
newName = input('I want to save the variable under the name:', 's');
save Data.mat ???
I hope that make sense
Thanks

Accepted Answer

Jan
Jan on 12 Aug 2013
Edited: Jan on 12 Aug 2013
myData = [1 2 3 4 5 6 7 8 9]; %data from my calculation
newName = input('I want to save the variable under the name:', 's');
S.(newName) = myData;
save('Data.mat', '-struct', 'S') % EDITED
  3 Comments
John Paden
John Paden on 30 Nov 2018
No it is does not copy. Matlab uses copy-on-write and does not make a copy unless changes are made to one of the variables. You can do any number of copies between variables, structure fields, or cell array elements and only a pointer to the original data is used to store the "copy". When any one of the copies is written to, the copy that is written to will be fully copied at that point, but all the other copies that are not written to will continue to point back to the original copy. For example, the following code only stores a single copy. The first line of code actually uses memory to store the variable. The next four lines are just pointers back to the original data.
>> test = zeros(250e6,1);
>> s.data = test;
>> C{1} = test;
>> C{2} = test;
>> C{3} = s.data;

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More Answers (2)

Bruno
Bruno on 25 Jul 2019
Maybe, a simples way to answer that need is to do the following:
fname = sprintf('Data.mat', myData);
save(fname)
Hope it can help others.

Azzi Abdelmalek
Azzi Abdelmalek on 11 Aug 2013
myData = [1 2 3 4 5 6 7 9];
newName = input('I want to save the variable under the name:', 's');
assignin('base',newName,myData)
save('Data.mat',newName)
  3 Comments
Azzi Abdelmalek
Azzi Abdelmalek on 12 Aug 2013
myData = [1 2 3 4 5 6 7 8 9]; %data from my calculation
newName = input('I want to save the variable under the name:', 's');
a.(newName)=myData;
save('Data.mat','-struct','a',newName)

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