I never knew about this pattern argument to rewrite. My guess is that there's a bug in there. According to the docstring, you're supposed to call it as f.rewrite([sin,], exp), but for me that does the same thing.
I would suggest using f.replace if you want targeted rewriting. Aaron Meurer On Tue, Nov 1, 2016 at 2:06 PM, Nathan Thern <[email protected]> wrote: > I'm new to sympy and pouring through the documentation. I don't understand > the "pattern" part of the argument to rewrite. The following portion of a > session illustrates my question: > >>>> f=sin(x)+cos(y)/gamma(z) >>>> f.rewrite(exp) > -I*(exp(I*x) - exp(-I*x))/2 + (exp(I*y)/2 + exp(-I*y)/2)/gamma(z) >>>> f.rewrite(sin,exp) > -I*(exp(I*x) - exp(-I*x))/2 + (exp(I*y)/2 + exp(-I*y)/2)/gamma(z) > > Why does rewrite(sin,exp) also rewrite the cos(...) part of the expression > when it has been explicitly given "sin" as the pattern to rewrite? > > NT > > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/f7874739-0d2b-4259-9b3d-76ae958daf8a%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6LDVcTXb0caRDutP0wfjj%2BtPSPbw-gJGksOR9108LG0Aw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
