A = matrix([[2, 1], [1, 7]])
B = matrix([[-2, 5], [0, 8]])
C = matrix([[6, 0, 3], [1, 0, -5]])
print A + B
print
print B + A

# A + B + C is undefined since they have different dimensions

SageDays/Kreyszig-6.1-1 (last edited 2010-08-09 13:41:15 by punchagan)