On Sat, Dec 1, 2012 at 6:46 PM, Chris Smith <[email protected]> wrote:
>
> that's what symbols does for you; just store the result in an array if you
> want:
>
>>>> a=symbols('a:11')
>>>> a[1]
> a1
>>>> a
> (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10)
But I already said that I can't use a Python list because I can't then
use something like a[i] as part of an expression where i is a symbol.
For example summation(a[i],(i,0,n)) would throw an IndexError or
something saying that the index of a list has to be an integer. The
SymList or something that I visualize should be able to handle the
above.
> Have you looked at Indexed?
Hey nice, but still I have this problem:
from sympy import IndexedBase
A=IndexedBase('A')
solve([A[0] + 5*A[1] - 2, -3*A[0]+ 6*A[1] - 15])
produces at the end of the source trace:
AttributeError: 'int' object has no attribute 'free_symbols'
The subscriptable symbol which I expect should be able to handle the
above solve command. Or if I have to alter my usage slightly (i.e.
without using all that atoms etc) for IndexedBase itself (or some
existing subclass thereof) to be able to handle the above solve,
please indicate it. Thanks!
--
Shriramana Sharma
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