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FreeMat
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Section: Array Generation and Manipulations
The permute function rearranges the contents of an array according to the specified permutation vector. The syntax for its use is
y = permute(x,p)
where p is a permutation vector - i.e., a vector containing the integers 1...ndims(x) each occuring exactly once. The resulting array y contains the same data as the array x, but ordered according to the permutation. This function is a generalization of the matrix transpose operation.
Here we use permute to transpose a simple matrix (note that permute also works for sparse matrices):
--> A = [1,2;4,5] A = 1 2 4 5 --> permute(A,[2,1]) ans = 1 4 2 5 --> A' ans = 1 4 2 5
Now we permute a larger n-dimensional array:
--> A = randn(13,5,7,2); --> size(A) ans = 13 5 7 2 --> B = permute(A,[3,4,2,1]); --> size(B) ans = 7 2 5 13