David, please start a new thread (and try IndexedBase instead of Function
and use [] instead of ()).
WRT CHATGPT: talk with it for a while trying to get it to compute the norm
of (1/2, 1, 1). When you tell it not to skip steps it can get it right, but
it is hard to get it to give you the correct symbolic and decimal answer at
the same time. The logic of the first part of the answer doesn't carry over
into the second half. And if you get it to succeed, then ask it for the
norm of (1/3, 1, 1).
/c
On Thursday, March 23, 2023 at 6:32:40 PM UTC-5 da...@dbailey.co.uk wrote:
> Dear Group,
>
> I tried to sum a finite set of elements, each consisting of a call to an
> undefined function:
>
> import sympy
> from sympy import *
> k=symbols("k")
> f=Function("f")
> print("f(k)=",f(k))
> print("sum=",sum(f(k),(0,k,10)))
>
> This produced the following output:
>
> f(k)= f(k)
>
> Traceback (most recent call last):
> File "C:\SymPyProject\test.py", line 6, in <module>
> print("sum=",sum(f(k),(0,k,10)))
>
> TypeError: 'f' object is not iterable
>
> I would have expected to get:
>
> f(0)+f(1)+f(2)+f(3)+f(4)+f(5)+f(6)+f(7)+f(8)+f(9)+f(10)
>
> I'm using version 1.12rc1, but I'm 98% certain I got the same error with
> 1.11
>
> Can anyone help?
>
> David
>
>
>
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