Swizzling (computer graphics)

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In computer graphics, swizzling means rearranging the elements of a vector.[1] For example, if A = {1,2,3,4}, where the components are x, y, z, and w respectively, you could compute B = A.wwxy, whereupon B would equal {4,4,1,2}. This is common in GPGPU applicationsTemplate:Examples.

In terms of linear algebra, this is equivalent to multiplying by a permutation matrix. If , then swizzling as above looks like

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