Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium Core
New issue 4051 by asmeu...@gmail.com: xreplace and Transform doesn't go
deep enough
http://code.google.com/p/sympy/issues/detail?id=4051
I thought this used to work. I had this pasted into a thread in the mailing
list from a while ago:
In [7]: a = sin(sin(x) + y) + sin(z)
In [8]: from sympy.core.rules import Transform
In [11]: a.xreplace(Transform(lambda x: cos(x.args[0]), lambda x:
isinstance(x, sin)))
Out[11]: cos(z) + cos(y + cos(x))
But now, I get
In [1]: In [7]: a = sin(sin(x) + y) + sin(z)
In [2]:
In [2]: In [8]: from sympy.core.rules import Transform
In [3]:
In [3]: In [11]: a.xreplace(Transform(lambda x: cos(x.args[0]), lambda x:
...: isinstance(x, sin)))
Out[3]: cos(z) + cos(y + sin(x))
i.e., it doesn't replace the inner sin(x). It doesn't work in 0.7.3 or
0.7.2, so I don't know where it started and stopped working.
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