The argument to subs should either be subs(old, new), or an iterable of (old, new) pairs, so subs(x, q0) or subs([(x, q0)]) (you can also pass in a dictionary like subs({x: q0})).
Aaron Meurer On Tue, Mar 24, 2015 at 4:44 PM, Sudhanshu Mishra <mrsu...@gmail.com> wrote: > Hi Scott, > > It looks like your subs call is wrong. It should be fn.subs(x, q0) > > Hope this helps. > > Sudhanshu Mishra > > On Wed, Mar 25, 2015 at 3:06 AM, Scott Guthery <sguth...@gmail.com> wrote: >> >> Any insight into the following will be greatly appreciated. Many thanks. >> >> from sympy import * >> >> x = symbols('x', integer=True) >> >> def main(fns, q0): >> for fn in fns: >> print(fn) >> print(fn.subs([x,q0])) >> >> if __name__ == '__main__': >> f1=x >> f2=x+2 >> main([f1,f2], 3) >> >> yields >> >> x >> Traceback (most recent call last): >> File ".../Subs.py", line 13, in <module> >> main([f1,f2], 3) >> File ".../Subs.py", line 8, in main >> print(fn.subs([x,q0])) >> File "C:\Python34\lib\site-packages\sympy\core\basic.py", line 842, in >> subs >> o, n = sequence[i] >> TypeError: 'Symbol' object is not iterable >> >> -- >> 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. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/sympy/b96b9f35-cd77-449a-bcf4-99668181633e%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 http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/CAFW_KCR2DpZKsWXuWJYW%3Dpwo1AsJf6sgCHbM0%3D%2BbfTMwF7bkLA%40mail.gmail.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 http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6JRjXBEi6ViEsn-pe2UXjdb%2BS-RsSgX-UDqrMUF3wpY2g%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.