Another option is to convert your list to a vector, and then convert it back. This is more awkward for a single operation but if you are doing lots of vector addition and scalar multiplication it can be the way to go. I.e. you can do:
sage: a = [3,4] sage: a = list(2*vector(a)) sage: a [6, 8] -M. Hampton On Oct 19, 1:15 am, Robert Bradshaw <[EMAIL PROTECTED]> wrote: > On Oct 18, 2008, at 10:14 PM, Alex Ghitza wrote: > > > Hmmm. As far as I know you can use _ as a placeholder for a > > variable, and it's meant for this kind of use (where you don't > > really want to introduce a new variable name). It's strange that > > it doesn't work for you. Can you post the error message that you get? > > Actually, _ is an actual variable, though personally I find it a bit > harder to read than a normal letter. The one special thing about it > (in ipython at least) is that it constantly gets reassigned to the > last returned value, e.g. > > sage: 1+2 > 3 > sage: _ > 3 > > - Robert --~--~---------~--~----~------------~-------~--~----~ 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://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
