It depends what exactly you want to do.
If you need it just for typography purposes (e.g. writing something in
IPython notebook and wanting to print the expression) you are using sympy
incorrectly. SymPy is not a typography library. (if you insists there are
hacks to do it)
On the other hand quite frequently you need this for meaningful mathematics.
- if you want to work on polynomials and do certain operations (finding
roots, etc) over a given field, you do this by specifying the field during
the creation of the polynomial.
- there is some work in progress to be able to do the same for matrices,
but it is not ready.
- in general, there is the assumption module. It is a bit of a mess,
because we have an old and a new assumption module and we try to move to
the new one. If all that you want is for abs(x) to automatically return x
(or something similar) it suffices to define x as `x=Symbol('x',
positive=True)`. There are a few other handles like `real` and `integer`.
- if you need something more general or more fancy, we may have it in some
(possibly unfinished, mostly unused) form, but it goes deeper in SymPy so a
more precise question will help us give you a more precise answer.
On 24 July 2013 13:10, Ben Lucato <[email protected]> wrote:
> We can represent domains on paper quite easily - for instance we can write
> x < 0, or alternatively x (epsilon symbol) R-, or even x (epsilon symbol)
> (-infinity, 0)
>
> I looked around but couldn't really find that - is there a canonical way
> to be writing domains in SymPy?
>
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