On Tue, 19 Oct 2021 at 20:55, David Bailey <d...@dbailey.co.uk> wrote:
>
> Dear group,
>
> First I would like to say how good it was to discover that the online
> SymPy documentation now supports copy/paste operations without
> constantly switching to SymPyLive. I think this will make the
> documentation considerably more user friendly.
I'm not sure what has changed there...
> My question is what construct should I use to get variables with
> subscripts, and maybe superscripts. I thought at first that indexed
> objects were the way to go, but they seem rather obscure. E.g. think of
> indexing through the Bessel functions - J0, J1,J2 etc.
>
> Ideally I'd like to loop over the index/indices and also see the
> subscripts positioned below the main symbol when using Latex output
I'm not completely sure what you want here but is this it:
In [19]: symbols('x:10')
Out[19]: (x₀, x₁, x₂, x₃, x₄, x₅, x₆, x₇, x₈, x₉)
IndexedBase is for the situation where you want the index to be symbolic e.g.:
In [27]: xi = IndexedBase('x')
In [28]: n, m = symbols('n, m')
In [29]: Sum(xi[n], (n, 1, m))
Out[29]:
m
___
╲
╲
╱ x[n]
╱
‾‾‾
n = 1
--
Oscar
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