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
>>
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