Vinzent Steinberg wrote: > On May 4, 3:31 pm, Akshay Srinivasan <[email protected]> > wrote: > >> Vinzent , I wanted to know how you planned to change the terms after >> they were returned by find. This isn't entirely obvious to me. Shouldn't >> the replacement part be inside find itself ? >> > > This is a good question. :) Sympy expressions are immutable, so it's > necessary to rebuild the whole expression with the replacements > applied. I did not want to cope with this, so I just intended to write > a function that finds all occurrences of a certain pattern (for > example sin(x)/cos(x)) in an expression. Using this, I could just pass > over the job to subs. Of course this is quite inefficient, but it > should work. :) > > Vinzent > > > >>> expr=tan(x**2)+x**2 >>> find(expr,a**2) [x**2,x**2]
but, >>> expr=tan(x) + x >>> find(expr,a) [tan(x), x, x] This returns everything in the expression instead of giving [x,x] . I guess this has something to do with expr.match ? I'm reminded of os.walk . Akshay --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
