MATLAB: Concatenate layered matrix into one layer

MATLABmatrixmatrix manipulation

I have a 2x133xi layered matrix. How can I take the i layers and combine it into a single layer matrix? So if i = 5 and I had a 2x133x5 matrix, the end result would be just a 2×665? I tried using the cat function but I can't seem to automate it for any number i.

Best Answer

a = randi(10, 2, 133, 5);
b = reshape(a, size(a, 1), size(a, 2) * size(a, 3));

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MATLAB: Concatenate

Paulo answered the question as you phrased it, but if you know the exact number of results you are producing (or if the maximum number of results is "reasonably close" to the likely number of results), then you are better off pre-allocating memory for the results:

a = zeros(10,1);
for b = 1:10
  a(b) = 3*b+5;  %for example
end

When you get to thousands of elements, pre-allocating can be much much faster.

MATLAB: Concatenate

This makes the 5x3 that you requested.

c1 = {'hello' 'world' 'Happy Tuesday'};
c2 = {'Need' 'coffee' 'now'};
m1 = magic(3);
C = vertcat(c1,c2,num2cell(m1));

To make a 3x5 use;

C = horzcat(c1',c2',num2cell(m1));

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MATLAB: Concatenate

MATLAB: Concatenate

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