Yes, that's what I got. Maybe because I'm only using SAGE 3.1.1 or there is something wrong with the installation.
sage: vector([k for k in range(10)]) ----------------------------------------------------------------------------------------------------------- TypeError Traceback (most recent call last) /home/pong/sage/<ipython console> in <module>() /home/pong/sage/free_module_element.pyx in sage.modules.free_module_element.vector (sage/modules/ free_module_element.c:2376)() /home/pong/sage/free_module_element.pyx in sage.modules.free_module_element.prepare (sage/modules/ free_module_element.c:2622)() TypeError: unable to find a common ring for all elements On Oct 20, 2:09 pm, "William Stein" <[EMAIL PROTECTED]> wrote: > On Mon, Oct 20, 2008 at 2:06 PM, pong <[EMAIL PROTECTED]> wrote: > > > 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 > > I get > > sage: vector( [k for k in range(10)]) > (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) > > Are you sure that's what you typed? > > > > > > > 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 > > -- > William Stein > Associate Professor of Mathematics > University of Washingtonhttp://wstein.org --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
