Thanks Marshall. I have thought about that as well. Since I want to optimize time. I want to see if your method is faster then a for loop. However, I run into something puzzling:
vector( [k for k in range(10)]) results in an error. Sage compliant about TypeError: unable to find a common ring for all elements But if you check each element of the list, I got <type 'int'> So why SAGE is complaining? On Oct 19, 7:27 am, Marshall Hampton <[EMAIL PROTECTED]> wrote: > 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 -~----------~----~----~----~------~----~------~--~---
