IPERMUTE Array Inverse Permutation Function

Section: Array Generation and Manipulations

Usage

The ipermute function rearranges the contents of an array according to the inverse of the specified permutation vector. The syntx for its use is 
   y = ipermute(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 inverse of the given permutation. This function and the permute function are inverses of each other.

Example

First we create a large multi-dimensional array, then permute it and then inverse permute it, to retrieve the original 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 

--> C = ipermute(B,[3,4,2,1]);
--> size(C)

ans = 
 13  5  7  2 

--> any(A~=C)

ans = 

(:,:,1,1) = 
 0 0 0 0 0 

(:,:,2,1) = 
 0 0 0 0 0 

(:,:,3,1) = 
 0 0 0 0 0 

(:,:,4,1) = 
 0 0 0 0 0 

(:,:,5,1) = 
 0 0 0 0 0 

(:,:,6,1) = 
 0 0 0 0 0 

(:,:,7,1) = 
 0 0 0 0 0 

(:,:,1,2) = 
 0 0 0 0 0 

(:,:,2,2) = 
 0 0 0 0 0 

(:,:,3,2) = 
 0 0 0 0 0 

(:,:,4,2) = 
 0 0 0 0 0 

(:,:,5,2) = 
 0 0 0 0 0 

(:,:,6,2) = 
 0 0 0 0 0 

(:,:,7,2) = 
 0 0 0 0 0