I would use ITE for this case. It's the boolean version of Piecewise. Aaron Meurer
On Thu, Aug 18, 2016 at 9:51 AM, Vincent Noel <labest...@gmail.com> wrote: > Hi, > > I'm trying to represent a weird case using piecewise functions : > > z = sympy.Piecewise((True, x>0), (False, True)) > > A piecewise function returning a boolean value... so far so good. The > problems comes when I want to use that as a condition inside another > Piecewise : > > z2 = sympy.Piecewise((1,z), (0, True), evaluate=False) > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > File > "/usr/local/lib/python2.7/dist-packages/sympy/functions/elementary/piecewise.py", > line 104, in __new__ > " Boolean, or a built-in bool." % (cond, type(cond))) > TypeError: Cond Piecewise((True, x > 0), (False, True)) is of type > Piecewise, but must be a Relational, Boolean, or a built-in bool. > > z being obviously a boolean, is there no way for sympy to recognize that and > accept it as a condition ? > > Vincent > > -- > 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 https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/d0a66ce7-d965-4810-bb33-eca9bb2bdc54%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 sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. 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%3D6%2BHVrOj%3DGe4LyOYk4JjRMoOmYHwcqU9%3Dj%3DwbAnTbyoy_w%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
