Programming Question: How do you augment one matrix with another?

[parisse]

[op(M1),op(M2)] glues two matrix one over the second one. augment(M1,M2) works in Xcas, but for some unknown reason it was removed on the Prime, but you can use concat instead.
I recommend to use lowercase commandnames for CAS operations, even if the command exists uppercase, since you are certain to call the native CAS command.