I am hoping this feature exists, if not would be a great addition. I am looking for the ability to perform matrix operations using by variable. Currently this feature exists only in data tables as far as I am aware. Having this featute will enable sorting matrixes possible without using loops.
A = Random Index(10^4,10^2);
B = Shape(A,10,10);
C = Sort Descending(B); // Fails since function only supports vector or list
D = Rank(B);// Fails since function only supports vector or list