Well that would only affect what you do in your own workspace. Much
better would be if sympy transparently imported and used csympy
wherever relevant when it was available, so that sympy.Symbol would be
csympy.Symbol, and so on. Then everywhere in sympy would use csympy.

But this requires full interoperability between sympy and csympy
(which is one of the things I have not seen yet). I think the next
task for csympy should be:

- Patch sympy/core/symbol.py to use csympy.Symbol (so that from
sympy.core.symbol import Symbol gives csympy.Symbol)
- Run the tests
- Fix whatever fails
- Repeat with further csympy objects

And always do this with every csympy object that is written. We
perhaps need a more unified way to automatically replace anything in
sympy with csympy (especially since Ondrej still hasn't provided a
clear separation between what will and will not be in csympy, at least
in my mind).

Then we can stop making these artificial benchmarks and performance
speculations, and just see what really is slow, and what really speeds
things up, and, just as importantly, what doesn't speed things up
enough to warrant the complexity cost.

I would focus on this rather than PyDy specifically. It may be
possible to use csympy in PyDy without doing this, but it will be a
wasted effort if you eventually do this and then the PyDy specific
implementation can be scrapped.

Aaron Meurer

On Wed, Apr 23, 2014 at 5:19 PM, Matthew Rocklin <[email protected]> wrote:
> Perhaps a good target workflow would be something like the following
>
> from sympy import *
> from csympy import *
>
> ... do work as usual ...
>
> In other words it would be nice for csympy to take over from sympy where it
> has functionality, but for sympy-proper to fill in all of the holes.
> Ondrej, is this on your roadmap at all?
>
> It gets weird of course when you have something like Expr(...) + CExpr(...)
>
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