Updates:
Labels: -NeedsReview
Comment #1 on issue 1475 by ondrej.certik: New implementation of .eval in
trigonometric functions, implementing sec, csc
http://code.google.com/p/sympy/issues/detail?id=1475
Hi Luke
thanks for working on this! The right command to switch to the branch is
actually:
git co -b trigsimp origin/trigsimp
also I suggest you push the main sympy branch into the master branch to
your repo. I
am on IRC if you need help with this.
I have some small comments, like why are you adding the print statements
etc. in the
first patch.
Let's just concentrate on sin/cos/tan/cot for now, lets get it fixed and
pushed in
and then let's implement the other ones.
As to the rewrite stuff, it works like this:
In [6]: tan(x).rewrite(cos)
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
/tmp/a/sympy/<ipython console> in <module>()
/tmp/a/sympy/sympy/core/basic.pyc in rewrite(self, *args, **hints)
1512
1513 if not pattern:
-> 1514 return self._eval_rewrite(None, rule, **hints)
1515 else:
1516 if isinstance(pattern[0], (tuple, list)):
/tmp/a/sympy/sympy/core/function.pyc in _eval_rewrite(self, pattern, rule,
**hints)
333 if pattern is None or isinstance(self.func, pattern):
334 if hasattr(self, rule):
--> 335 rewritten = getattr(self, rule)(*args)
336
337 if rewritten is not None:
/tmp/a/sympy/sympy/functions/elementary/trigonometric.pyc in
_eval_rewrite_as_cos(self, arg)
660
661 def _eval_rewrite_as_cos(self, arg):
--> 662 return -cos(x + S.Pi/2)/cos(x)
663
664 def _eval_rewrite_as_cot(self, arg):
NameError: global name 'x' is not defined
E.g. the function _eval_rewrite_as_cos gets called and it breaks because
its wrong,
as you said. Thanks for looking into this! It needed fixing for a long
time. All
tests pass, so ping me if you think it should go in, we will do final
polish and push
it in.
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