Hi ab0c1d0ef, On Fri, Jul 11, 2014 at 11:02 AM, <[email protected]> wrote: > Dear user and developers, > > I'm new to sympy and tried a few things out, of course I stumbled across > smth I coudln't understand. > So here is my question: > > If I define an expression like > g=sqrt(a/pi)*exp(-a*x**2) > and integrate it like > integrate(g,(x,-oo,oo)) > I get the expected result (1). > > But if I integrate an expression like > g=sqrt(1/a/pi)*exp(-x**2/a) > and integrate it the same way I get > ( a * sqrt(1/a) ) / sqrt(polar_lift(a)) > > I must admit I'm a little bit frightened by the polar_lift function because > I've never heard of it, but it seems to give the argument of a complex > number. Is this correct? > But then I don't understand why for > a=Symbol('a',real=True) > g=sqrt(1/a/pi)*exp(-x**2/a) > simplify(integrate(g,(x,-oo,oo))) > I still don't get 1 as a result.
Thanks for reporting this, I think you might have discovered a bug. Btw, this is what I get with the latest master: https://gist.github.com/certik/cd8cd4c0a7f0ba04c719 But it still shows the behavior you described. Ondrej > > Would be nice to know. > Thanks in advance. > > -- > 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 http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/b8b2b9f1-596c-416d-a0e9-bb3d17bb6b15%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 http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CADDwiVB580qeT9gmHFGM_ugDssxiWY4cRP9KJVwTV44ppwVaag%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
