MATLAB Answers


Extraction of individual matrix from cell array

Asked by Praveen Kumar Ramani on 1 Feb 2019
Latest activity Edited by Guillaume
on 1 Feb 2019
I want to extract all the matrix in cell array as individual matrix in my workspace
Plz find attached mat file
help me out with the code


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1) i want to check matix if all three columns has zero entry i need to delete the entry
2) i want to pass each array element to certaim function as input
@Praveen Kumar Ramani: both of those will be much simpler with indexing. Do you have any relevant reason why you need to force yourself into writing slow, complex, buggy code?
Gah! You've already asked this question, been told not to do that and shown how to use your cell array efficiently. So wy do you persist?
Of course, now that you've been shown a way to do it you've accepted it. Except as you've been told repeatedly, it makes your life harder not easier. Sure enough, as predicted, your next question is how do I use all these variables that I've pointless created. Well, you can't easily because you've done exactly what we told you not to do.
If you don't listen to our advice why should we bother answering you.

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2 Answers

Answer by Mundrathi Venugopal on 1 Feb 2019
 Accepted Answer

After loading the mat file,I guess you would probably wanna do this.
for i=1:numel(Microtrips),eval(['MT' num2str(x) ' = Microtrips{' num2str(x) '};']);end
However, Many common uses of the eval function are less efficient and are more difficult to read and debug than other MATLAB functions and language constructs.


It is not suggested to use eval.
"...I guess you would probably wanna do this."
Or you could read the MATLAB documentation, which states "A frequent use of the eval function is to create sets of variables such as A1, A2, ..., An, but this approach does not use the array processing power of MATLAB and is not recommended. The preferred method is to store related data in a single array".
Good luck with your pointlessly slow, pointlessly complex code!

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Answer by KSSV
on 1 Feb 2019
Edited by KSSV
on 1 Feb 2019

Praveen Kumar Ramani it is a bad idea to save each cell into individual matrix.....infact you need not to do it. It is waste of memory and waste of time. Already you have your information in hand in a proper and neat way. You can extract any value you want using :
for i = 1:length(Microtrips)
iwant = Microtrips{i}


Show 1 older comment, if you want third cell from Microtrips use
If you want first use:
You have access to every matrix you want already.....there is no requirement to save it into individual matrix again.
i want all cell as individual from 1 to n
YOu have that already in hand....
for i = 1:length(Microtrips)

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