MATLAB: Reshape loop resulted cell array

reshape

hi, the script below is supposed to result a (n,3) vector, what I got is (180,60) vector, kindley help

c1 = cell(numel(a11),1);

for ii = 1:length(L1);

for kk = 1:length(a11);

c1{ii,kk}=cross(L1(ii,:),a11(kk,:));

end

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result = cell2mat(c1(:))';

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c1 = cell(numel(a11),1); % before loop use numel instead of length
c1{ii} = ... inside loop

MATLAB: How can i build a for loop to create histograms for a multiple cell array

First, don't use 2D indexing for vectors. result{ii} will work whether result is a row or column vector. Your result{1, ii} will only work for a row vector and fail if that untested assumption is broken.

Note that the output of result{ii} (or result{1, ii}) is, as you've stated a 1x20 cell array. Again, it's a vector and you're using 2D indexing on that with index (:, ii+1). Since that cell array has only 1 row, : is equivalent to 1, so your Lnodo1 is:

Lnodo1 = cell2mat(result{1, ii}(1, ii+1));

written a lot more simply as

Lnodo1 = result{ii}{ii+1}; %the use of cell2mat is pointless, {} indexing instead of () indexing yields the same result

So basically, you Lnodo1 is in turn result{1}{2}, result{2}{3}, ..., result{20}{21}. That last one will cause an index exceeds matrix dimension error as well. Certainly it doesn't do what you want but I'm not sure why you didn't spot that.

Since you want to interate over the cells of the outer array and the cells of the inner array, you need a double for loop

for outer = 1:numel(result)  %prefer numel to length, it's safer
    for inner = 1:numeL(result{outer})
        L_nodo1 = result{outer}{inner};
        %... your histogram code. Perfer histogram to hist
        pngfilename = sprintf('hist%d_%d.png', outer, inner);
        %... rest of export code
    end
end

As Image Analyst suggest, you could avoid the cell arrays entirely, and store your data as an 80x400 matrix, which would make your life simpler, would use a lot less memory and be faster to process.

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MATLAB: Pre allocating vector for loop

MATLAB: How can i build a for loop to create histograms for a multiple cell array

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