MATLAB array manipulation tips and tricks

CHAPTER 9. ROTATING MATRICES AND ARRAYS 269.4.5 “Outer” block rotation 90 degrees counterclockwiseGeneral caseuseTo perform the rotationX = [ A B ... [ ... ...C D ... => B D ...... ... ] A C ... ]Y = reshape( X, [ p m/p q n/q ] );Y = Y(:,:,:,n/q:-1:1);Y = permute( Y, [ 1 4 3 2 ] );Y = reshape( Y, [ p*n/q q*m/p ] );% or Y = Y(:,:,:,end:-1:1);Special case: m=pTo perform the rotationuse[ A B ... ] => [ ...BA ]Y = reshape( X, [ p q n/q ] );Y = Y(:,:,n/q:-1:1);Y = permute( Y, [ 1 3 2 ] );Y = reshape( Y, [ m*n/q q ] );% or Y = Y(:,:,end:-1:1);Special case: n=qTo perform the rotationuseX = [AB => [ A B ... ]... ]Y = reshape( X, [ p m/p q ] );Y = permute( Y, [ 1 3 2 ] );Y = reshape( Y, [ p n*m/p ] );% or Y(:,:);