Great. It's worth taking a read of http://docs.sympy.org/0.7.3/tutorial/simplification.html#exponentials-and-logarithms if you are new to this function (the bit about assumptions is particularly important to understand).
Aaron Meurer On Wed, Jul 24, 2013 at 6:07 AM, Ben Lucato <ben.luc...@gmail.com> wrote: > L-l-l-l-l-legend. expand_log works like a charm, with a bit of tweaking. > Thanks a bunch! > > > On Tuesday, 23 July 2013 13:01:50 UTC+10, Aaron Meurer wrote: >> >> Sorry, but some powers automatically denest: >> >> In [6]: print sqrt(x/2) >> sqrt(2)*sqrt(x)/2 >> >> so it is impossible to pull them together. >> >> expand_log does what you want, though it also expands using the >> additive rule. It's not too much more complicated to make it work with >> a multiplication of powers instead of a single power, though, if you >> insist on writing your own targeted simplification function. >> >> Aaron Meurer >> >> >> On Mon, Jul 22, 2013 at 2:28 AM, Ben Lucato <ben.l...@gmail.com> wrote: >> > Say I have an expression like: >> > >> > y = sqrt(2) * sqrt(-x + 4)/2 >> > >> > and then we call powsimp(y), we get: >> > >> > sqrt(-2*x + 8)/2 >> > >> > is there a way to get >> > >> > sqrt((-x + 4) / 2), i.e. have the denominator of the fraction be checked >> > too? I tried looking at the docs but there didn't seem to be a >> > simplification for this. >> > >> > >> > My reasoning is for writing logs: if I can collect everything inside a >> > log >> > to have a power, then that power can be moved outside the log - in this >> > case, log(y) would become: >> > >> > log((-x + 4) / 2) / 2 >> > >> > -- >> > 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 sympy+un...@googlegroups.com. >> > To post to this group, send email to sy...@googlegroups.com. >> > Visit this group at http://groups.google.com/group/sympy. >> > For more options, visit https://groups.google.com/groups/opt_out. >> > >> > > > -- > 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 sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > Visit this group at http://groups.google.com/group/sympy. > For more options, visit https://groups.google.com/groups/opt_out. > > -- 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 sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. For more options, visit https://groups.google.com/groups/opt_out.
