On Thu, Aug 21, 2008 at 2:21 AM, Harald Schilly <[EMAIL PROTECTED]> wrote: > > On Aug 21, 7:18 am, Tim Lahey <[EMAIL PROTECTED]> wrote: > >> 2. Like M. Hampton, I miss implicit variables. ... > > One thing I came across is, that symbolic expressions with predefined > variables (i.e. they are not variables) confuse someone when used in > functions. > for example > x = 5 > solve([x^2==3], x) > then solve does nothing. I think, because there is an explicit x, it > would be nice to have at least a warning message telling the user that > x is not a symbolic variable, but already assigned. >
This is an extremely good idea and trivial to implement, so I've made it: http://trac.sagemath.org/sage_trac/ticket/3921 By "missing implicit variables", does Tim mean that he really doesn't like having to type var('x') and just wants x to be magically defined to be symbolic the first time it is used? William --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@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-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
