Rotates an array about two specified dimensions
Rotates an array about two specified dimensions by any number of 90 degree turns
arot(a, rights = 1,pair=1:2)
a |
The array to be rotated |
rights |
Integer; number of right angles to turn |
pair |
A two-element vector containing the dimensions to rotate with default meaning to rotate about the first two dimensions |
Function arot() is not exactly equivalent to octave's
rotdim(); in arot() the order of the elements of
pair matters because the rotation is clockwise when viewed
in the (pair[1],pair[2]) direction. Compare octave's
rotdim() in which pair is replaced with
sort(pair).
Note also that the rotation is about the first two dimensions
specified by pair but if pair has more than two elements
then these dimensions are also permuted.
Also note that function arot() does not treat singleton
dimensions specially.
Robin K. S. Hankin
a <- array(1:16,rep(2,4)) arot(a)
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