Updates:
Status: Started
Labels: NeedsBetterPatch
Comment #5 on issue 1565 by ondrej.certik: powsimp() does not combine
exponents in some cases.
http://code.google.com/p/sympy/issues/detail?id=1565
I get some conflicts when merging your branch. I apologize for forgetting
about this.
do you know how to fix this easily?
$ git di
diff --cc sympy/simplify/simplify.py
index 027f1cf,efc7da5..0000000
--- a/sympy/simplify/simplify.py
+++ b/sympy/simplify/simplify.py
@@@ -1042,32 -934,33 +1042,55 @@@ def powsimp(expr, deep=False, combine='
combine='exp' will strictly only combine exponents in the way
that use
to be automatic. Also use deep=True if you need the old behavior.
+ When combine='all', 'exp' is evaluated first. Consider the first
+ example below for when there could be an ambiguity relating to
this.
+ This is done so things like the second example can be completely
+ combined. If you want 'base' combined first, do something like
+ powsimp(powsimp(expr, combine='base'), combine='exp').
+
== Examples ==
>>> from sympy import *
++<<<<<<< HEAD:sympy/simplify/simplify.py
+ >>> x,n = symbols('xn')
+ >>> e = x**n * (x*n)**(-n) * n
+ >>> powsimp(e)
+ n**(1 - n)
+
+ >>> powsimp(log(e))
+ log(n*x**n*(n*x)**(-n))
+
+ >>> powsimp(log(e), deep=True)
+ log(n**(1 - n))
+
+ >>> powsimp(e, combine='exp')
+ n*x**n*(n*x)**(-n)
+ >>> powsimp(e, combine='base')
+ n*(1/n)**n
+
+ >>> y, z = symbols('yz')
+ >>> a = x**y*x**z*n**z*n**y
+ >>> powsimp(a, combine='exp')
++=======
+ >>> x, y, z, n = symbols('xyzn')
+ >>> powsimp(x**y*x**z*y**z, combine='all')
+ x**(y + z)*y**z
+ >>> powsimp(x**y*x**z*y**z, combine='exp')
+ x**(y + z)*y**z
+ >>> powsimp(x**y*x**z*y**z, combine='base')
+ x**y*(x*y)**z
+
+ >>> powsimp(x**z*x**y*n**z*n**y, combine='all')
+ (n*x)**(y + z)
+ >>> powsimp(x**z*x**y*n**z*n**y, combine='exp')
++>>>>>>> aaron/powsimp-fix:sympy/simplify/simplify.py
n**(y + z)*x**(y + z)
- >>> powsimp(a, combine='base')
+ >>> powsimp(x**z*x**y*n**z*n**y, combine='base')
(n*x)**y*(n*x)**z
- >>> powsimp(a, combine='all')
- (n*x)**(y + z)
+
+ >>> powsimp(log(exp(x)*exp(y)))
+ log(exp(x)*exp(y))
+ >>> powsimp(log(exp(x)*exp(y)), deep=True)
+ x + y
"""
if combine not in ['all', 'exp', 'base']:
raise ValueError, "combine must be one of
('all', 'exp', 'base')."
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