combine two matrices and delete one column or row of a matrix in maxima



Dear all,

Could we combine two matrices and delete one column or row of a matrix in
maxima? I need these operations in a function. Let m, n be two matrices
with the same number of rows and whose number of columns are k and l
respectively. I would like to form a new matrix c whose first k column is m
and whose last l columns is n. Is there a function in maxima that can
produce the matrix c?

Let m be a matrix with arbitrary size. I would like produce a matrix c
obtained from m by deleting the last s columns of m. Is there a function in
maxima which can produce the matrix c? Thank you very much.

Best wishes,
Jianrong.