On Sat, Jun 6, 2009 at 3:25 AM, smichr<[email protected]> wrote: > > > > On Jun 6, 12:36 pm, Ivannie <[email protected]> wrote: >> Hello everyone, >> >> Now I am doing something on trigsimp in simplify.py, I wonder how >> can I get to know if a symbol a fraction? >> > > Do you mean a symbol or do you mean an expression? I'm not sure a > symbol (like x) can have a fraction attribute, but an expression like > y=x/3 can be tested to see if it is a fraction or not by looking at > the item in the 2nd position of the tuple that fraction(y) returns: > > ### >>>> x=var('x') >>>> y=x/3 >>>> fraction(y) > (x, 3) >>>> fraction(x) > (x, 1) > ### > > In the case that there is something in the denominator, the 2nd value > in the tuple is not 1.
fraction() is probably the best things, but you can also access the .args arguments directly: In [5]: y = x/3 In [7]: y.args Out[7]: (1/3, x) a fraction happens whenever there is one argument in the Mul() that is 1/something. Ondrej --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sympy?hl=en -~----------~----~----~----~------~----~------~--~---
