CODEWITHSUNDEEP
matlabvariablesdynamic-programming
Mohammad
Mohammad

Reputation: 7418

A way to dynamically create variables in Matlab?

The case I am working on is dividing a big three-dimensional array of data that I have collected using good coding practises (etc...) and now I need to segment the layers of this array into separate variables for individual processing elsewhere, I can't call my data like this BigData(:,:,n).

So I would like to create a loop where I create new variables like so 

for i=1:n

createVariable('user_' i) = BigData(:,:,i);

end

How do I do this without writing n new variables by hand every time?

user_1 = BigData(:,:,1);
user_2 = BigData(:,:,2);
user_3 = BigData(:,:,3);
.
.
.

Upvotes: 1

Views: 1344

Answers (2)

Luis Mendo
Luis Mendo

Reputation: 112679

Your disclaimer sounds convincing :-) I'll get those downvotes too. But, to be clear: using separate variables for this is bad practice.

You can use assignin to create the variables and assign them values:

for ii = 1:n
    assignin('base', ['user_' num2str(ii)], BigData(:,:,ii));
end

And yes, using separate variables for this is bad practice.

Upvotes: 2

Eli Duenisch
Eli Duenisch

Reputation: 526

Try using eval() - but as you said it is seen as a very bad practice. If you still want to use this, it is straight forward like:

for i = 1:n
    eval(['user_',num2str(i),' = BigData(:,:,',num2str(i),');']);
end

Upvotes: 1

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