Creating 3D matrix from a vector with special order of elements without using a loop command
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Imagine a vector P of the form P=[ p 1, p 2, p 3, ... p k] where k is the number of elements in vector P. I would like to create an i X j X k dimensional matrix Q where Q(i,j,1)= p 1, Q(i,j,2)= p 2, ..., Q(i,j,k)= p k. Naturally this would be easy using a loop command but I was wondering if it is possible to do this using only matrix manipulation possibilities within Matlab.
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>> R = 2; %rows
>> C = 3; %columns
>> P = 1:6;
>> Q(R,C,:) = P;
>> size(Q)
ans =
2 3 6
This places the vector P along the third dimension (page) on row 2, column 3. The other values will be automatically filled with zeros. If instead you want the vector P replicated (without any zeros), then try this:
>> Q = repmat(reshape(P,1,1,[]),R,C);
>> size(Q)
ans =
2 3 6
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