Comment #10 on issue 1320 by johann.cohentanugi: simplify does not simplify
commutted diffs
http://code.google.com/p/sympy/issues/detail?id=1320
indeed, thanks. So here is my patch, I took the liberty to add the few
trivial diff
tests in a separate function... I do not know why I get the nsimplify lines
in my
patch, probably some mystery with DVCS that I am not familiar with.
[co...@jarrett sympy]$ git diff -r HEAD
sympy/simplify/tests/test_simplify.py
diff --git a/sympy/simplify/tests/test_simplify.py
b/sympy/simplify/tests/test_simplify.py
index 2b9b2e3..d3dc547 100644
--- a/sympy/simplify/tests/test_simplify.py
+++ b/sympy/simplify/tests/test_simplify.py
@@ -1,7 +1,7 @@
from sympy import Symbol, symbols, together, hypersimp, factorial,
binomial, \
collect, Function, powsimp, separate, sin, exp, Rational,
fraction, \
simplify, trigsimp, cos, tan, cot, log, ratsimp, Matrix, pi,
integrate, \
- solve, nsimplify, GoldenRatio, sqrt, E, I, sympify, atan,
Derivative, S
+ solve, nsimplify, GoldenRatio, sqrt, E, I, sympify, atan,
Derivative, S, diff
from sympy.utilities.pytest import XFAIL
@@ -353,3 +353,13 @@ def test_nsimplify():
assert nsimplify(0.33333, tolerance=1e-4) == Rational(1,3)
assert nsimplify(2.0**(1/3.), tolerance=0.001) == Rational(635,504)
assert nsimplify(2.0**(1/3.), tolerance=0.001, full=True) ==
2**Rational(1,3)
+
+def test_diff():
+ x = Symbol("x")
+ y = Symbol("y")
+ f = Function("f")
+ g = Function("g")
+ assert simplify(g(x).diff(x)*f(x).diff(x)-f(x).diff(x)*g(x).diff(x))
== 0
+ assert simplify(2*f(x)*f(x).diff(x)-diff(f(x)**2,x)) == 0
+ assert simplify(diff(1/f(x),x)+f(x).diff(x)/f(x)**2) == 0
+ assert simplify(f(x).diff(x,y)-f(x).diff(y,x)) == 0
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