Am 09.09.2012 01:43, schrieb David Li:
Okay, so I've worked a bit on implicit multiplication and implicit function
application for sympify. A demo of SymPy Gamma with the changes is at
http://sympy-gamma-li.appspot.com/ (+ a visual overhaul, update to Python
2.7 runtime, new Django version). Expressions like
'2x<http://sympy-gamma-li.appspot.com/input/?i=2x>',
'ln x <http://sympy-gamma-li.appspot.com/input/?i=ln+x>', and
'5exp(x^2)<http://sympy-gamma-li.appspot.com/input/?i=5exp%28x%5E2%29>'
should work now.
The SymPy branch is at
https://github.com/lidavidm/sympy/tree/sympify_implicit_mul_and_apply. I am
still working on making sure the implicit application doesn't apply to
None, True, False, and other constants, making sure I haven't broken
anything/missed an edge case, and cleaning up the code.
I looked at the code, and found I had no idea what patterns are being
recognized, and what parts of the recognized structures are transformed
to what new structures.
Sure, I could trace the single statements and find out what each
function does, but it's really hard to get a bird's-eye view to work
from, you need to build understanding from the details.
So I'd recommend documenting
- the patterns
- the transformations
Alternatively, I'd find it desirable to write the code in a form that
directly expresses the patterns and transformations. This may be far
outside the scope of this work though, so YMMV.
Still, on my personal priority list, having explicit mention of patterns
and transformations would be ahead of adding new transformations, just
so that more people can follow what's happening and give feedback.
Just my 3c :-)
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