The - operator can also be used on lists and matrices. For the most part, it behaves in the intuitive way, distributing the operation over each element. However, subtracting a number from a matrix (or a matrix from a number) behaves differently: the number is only subtracted along the main diagonal of the matrix. For "normal" subtraction that applies to every element of the matrix, see .-.
:1-1 0 :5→x :2-3x -13 :[1,2;3,4]-100 [-99 2] [3 -96]