David & William, "David Joyner" <[EMAIL PROTECTED]> writes:
> I would use the lambda notation: > > sage: m = lambda x: matrix([[x[0],x[1]],[x[2],x[3]]]) > sage: m([1,2,3,4]) > > [1 2] > [3 4] > sage: m([1,2,3,a]) > > [1 2] > [3 a] > sage: m([a,b,3,4]) > > [a b] > [3 4] > > > There might be better ways though. > > ++++++++++++++++++++++++++++++++++++++++ "William Stein" <[EMAIL PROTECTED]> writes: > You should do m.substitute(a=1) just like you're doing -- unfortunately, > nobody implemented that yet, and it's doing some dumb generic behavior. > [...] > Fortunately, I just implemented this for SAGE-2.7.1, which I'll release very > very soon. Thank you both very much. It seems I need a careful read of the user manual, I had not picked up on lambda expressions. I am compiling 2.7.1 so will soon be able to test blah.substitute(a=1). Roger --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://sage.math.washington.edu/sage/ and http://sage.scipy.org/sage/ -~----------~----~----~----~------~----~------~--~---
