FlipGradientOrientation

FlipGradientOrientation[grad, perm] permutes the internal orientation of the gradients, perm can be any permutation of {"x","y","z"}. FlipGradientOrientation[grad, flip] flips the internal orientation of the gradients, flip can be {1,1,1}, {-1,1,1}, {1,-1,1} or {1,1,-1}. FlipGradientOrientation[grad, flip, perm] flips and permuter the internal orientation of the gradients. FlipGradientOrientation[grad, perm, flip]flips and permuter the internal orientation of the gradients.