I need to perform some calculations within a ring R in which x**3 = x for
each x in R.
To make simplifications I would have like to do something like:
>>> p = Wild('p')
>>> q = Wild('q', properties=(lambda w: w.is_Integer and w > 2,))
>>> (2*x**4 + y**2 - x**2 + y**3).subs(p**q, p**(q - 2*floor((q - 1)/2)))
y + x**2 + y**2
Unfortunately, "subs" doesn't work with "wild" symbols.
So I write a new simple "Basic" method:
def _eval_wild_subs(self, old, new):
old = sympify(old)
new = sympify(new)
m = self.match(old)
if m:
return new.subs(m)
elif self.args:
return self.func(*[arg._eval_wild_subs(old, new) for arg in
self.args])
else:
return self
That does what I need. Now, my questions are:
1) Is there a more "conventional" way, I missed, to achieve the above
result?
2) If not, are you interested in a commit of that kind?
Thanks...
Raffaele
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