a={1 1 1, 7 7 7}; b={0 0 0, 8 8 8}; c=a//b; For character matrices, the element size of the result matrix is the larger of the element sizes of the two operands.

You can concatenate two or more libraries by specifying their librefs or physical names in the LIBNAME statement or function. Physical names must be enclosed in single or double quotation marks in a ...