Ask Your Question

Revision history [back]

click to hide/show revision 1
initial version

Attention, pitfall:

a = b = vector(QQ,2)

is NOT a shortform of

a =  vector(QQ,2)
b =  vector(QQ,2)

The first creates exactly one vector object, a an b refer to the same object. The second creates two independent objects, a and b refer to different objects.

print a == b, a is b

shows the difference.