For matrices and vectors use the tilde (~) operator for horizontal concatenation and the pipe (|) operator for vertical concatenation. For example if you have two 5×1 vectors A and B, you can concatenate them into a 5×2 matrix like this:

newMat = A ~ B;

You could vertically concatenate them into a 10×1 vector like this:

newVec = A | B;

String Arrays

String arrays use the tilde (~) and pipe (|) operators, but they are prepended with the dollar sign ($). For example:

stringArrC = stringArrA $~ stringArrB;

stringArrD = stringArrA $| stringArrB;