Concatenate vector in a 3d matrix

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Alessandro Masullo 2012-4-13

Hi. I have these vectors: a = [11 12 13 14]; b = [21 22 23 24]; c = [31 32 33 34]; d = [41 42 43 44];

I want to concatenate them in a 2x2x4 matrix: M(:,:,1) = [11 21; 31 41]; M(:,:,2)= [12 22; 32 42]; and so on.

How can I do that?

James Tursa 2012-4-13

For your exact problem:

M = reshape([a;c;b;d],2,2,4);

Then generalize as appropriate. E.g., if a,b,c,d are not row vectors to start with,

M = reshape([a(:)';c(:)';b(:)';d(:)'],2,2,4);

etc.

Alessandro Masullo 2012-4-13

I would like to avoid cycles... :)

James Tursa 2012-4-13

MtimesV = mtimesx(M,V,'speed');

You can find mtimesx on the FEX here:

http://www.mathworks.com/matlabcentral/fileexchange/25977-mtimesx-fast-matrix-multiply-with-multi-dimensional-support

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