MATLAB: Cell array to Matrices

cell arraysMATLAB

Dear Matlab users, I have a cell array B 1×512 . now I want to divide every cell to a new matrix. So I will have 512 matrices.I prefer their names to be C1,C2…,C512. every "C" matrix is 10001×3 matrix.

I am using cell2mat option, but I want to write a loop which I cannot do it

    C1=cell2mat(B(1))

thi is working just for one, I do not want to do it one-by-one.

Thanks in advance,

Best Answer

You already have your C1, C2, ..., C512 in a very convenient container making it very easy to access: your cell array. Assuming your cell array is called C and not B, to get C1:

C{1}

to get C2:

C{2}

etc.

Creating numbered variables is an extremely bad idea. It's just going to make your code more complicated, slower, harder to debug for no gain whatsoever. See tutorial-why-variables-should-not-be-named-dynamically-eval for a complete explanation

What it looks like from your cell2mat(B(1)) is that you don't know how to access the data in a cell array. See the tutorials on the cell array page to learn the difference between () and {} indexing.

Related Solutions

MATLAB: Concatenate arrays within a loop,

Easy, given any number of arrays in a cell array C. You could use a loop like this, although it is inefficient because the output array is not preallocated:

C = {[1,2],[3,4],...} % cell array of arrays.
A = C{1};
for k = 2:numel(C)
    A = [A;C{k}];
end

Simpler and more efficient would be to concatenate them all at once, without a loop, e.g.:

A = vertcat(C{:})

Whatever you do, do NOT try to access variable names dynamically in a loop! Read this to know why:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Using an array (e.g. a cell array) and indexing is much simpler, neater, much more efficient, less buggy, and easier to debug.

MATLAB: Converting cell to 3 dimensional matrix

If C is your cell array:

 cell2mat(permute(C,[1,3,2]))

 cell2mat(reshape(C,1,1,[]))

 cat(3,C{:})

Best Answer

Related Solutions

MATLAB: Concatenate arrays within a loop,

MATLAB: Converting cell to 3 dimensional matrix

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