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45.3 Saving the gradient in a variables

If the directive


is given, the gradient is saved in variables GRADX, GRADY, GRADZ. GRADX(n) is the derivative with respect to $x$ for the $n$-th atom. The atoms are in the order as printed. This order can be different from the order in the input z-matrix, since the centres are reordered so that all atoms of the same type follow each other. 2018-08-15