data structure for a matrix (2 dimensional) whose elements are a vector
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I'd like to encode a m-by-n matrix using matlab.
Problem is each element of the matrix should be a vector of size k.
How to encode this kind of matrix efficiently?
Thanks
Dohoon
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James Tursa
2014-6-7
编辑：James Tursa
2014-6-7
For memory efficiency, you can use a 3D k-by-m-by-n array A. E.g.,
A(1:k,1,1) = 1st k-vector
A(1:k,2,1) = 2nd k-vector
etc
A(1:k,m,n) = last k-vector
Then each vector's elements would be contiguous in memory and could be extracted with the syntax A(:,x,y) for the "x-y-th" vector.
If you want the syntax to be more natural but give up a little in storage efficiency you can use a cell array. E.g.,
A(1,1) = {1st k-vector}
A(2,1) = {2nd k-vector}
etc
A(m,n) = {last k-vector}
The storage requirements are a bit more than the 3D array, but each vector's elements would still be contiguous in memory and could be extracted with the syntax A{x,y} for the "x-y-th" vector.
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