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Shift dimensions


B = shiftdim(X,n)
[B,nshifts] = shiftdim(X)


B = shiftdim(X,n) shifts the dimensions of X by n. When n is positive, shiftdim shifts the dimensions to the left and wraps the n leading dimensions to the end. When n is negative, shiftdim shifts the dimensions to the right and pads with singletons.

[B,nshifts] = shiftdim(X) returns the array B with the same number of elements as X but with any leading singleton dimensions removed. A singleton dimension is any dimension for which size(A,dim) = 1. nshifts is the number of dimensions that are removed.

If X is a scalar, shiftdim has no effect.


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Shift the dimensions of an array.

Compute a 5-D array A, and remove the leading dimensions of length 1. The shiftdim function shifts 2 dimensions and returns the 3-D array B.

A = rand(1,1,3,2,4);
[B,nshifts] = shiftdim(A);
nshifts = 2
ans = 

     3     2     4

Shift the dimensions of B twice to the left.

C = shiftdim(B,2);
ans = 

     4     3     2

Shift the dimensions of C once to the right.

D = shiftdim(C,-1); 
ans = 

     1     4     3     2

Extended Capabilities

Introduced before R2006a

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