details: http://hg.sympy.org/sympy/rev/d66dc8f1f107
changeset: 1849:d66dc8f1f107
user: Fabian Seoane <[EMAIL PROTECTED]>
date: Fri Oct 24 19:09:04 2008 +0200
description:
Make the constructor of Derivative treat correctly instances of Derivative.
It now collapses nested instances, so that Derivate(Derivative(f, x), x) ->
Derivative(f, x, x).
Two XFAIL test now pass. This also fixes #979 and #1124.
---
sympy/core/function.py | 2 +-
sympy/core/tests/test_basic.py | 1 -
sympy/core/tests/test_functions.py | 3 +++
sympy/simplify/tests/test_simplify.py | 1 -
4 files changed, 4 insertions(+), 3 deletions(-)
diffs (47 lines):
diff -r 3a9219d09389 -r d66dc8f1f107 sympy/core/function.py
--- a/sympy/core/function.py Mon Oct 20 17:19:52 2008 +0200
+++ b/sympy/core/function.py Fri Oct 24 19:09:04 2008 +0200
@@ -461,7 +461,7 @@
expr = sympify(expr)
if not symbols: return expr
symbols = Derivative._symbolgen(*symbols)
- if not assumptions.get("evaluate", False):
+ if not assumptions.get("evaluate", False) and not isinstance(expr,
Derivative):
obj = Basic.__new__(cls, expr, *symbols)
return obj
unevaluated_symbols = []
diff -r 3a9219d09389 -r d66dc8f1f107 sympy/core/tests/test_basic.py
--- a/sympy/core/tests/test_basic.py Mon Oct 20 17:19:52 2008 +0200
+++ b/sympy/core/tests/test_basic.py Fri Oct 24 19:09:04 2008 +0200
@@ -587,7 +587,6 @@
g = 1/r**2 * (2*r*psi(r).diff(r, 1) + r**2 * psi(r).diff(r, 2))
assert g.coeff(psi(r).diff(r)) == 2/r
[EMAIL PROTECTED]
def test_coeff2_0():
var('r, kappa')
psi = Function("psi")
diff -r 3a9219d09389 -r d66dc8f1f107 sympy/core/tests/test_functions.py
--- a/sympy/core/tests/test_functions.py Mon Oct 20 17:19:52 2008 +0200
+++ b/sympy/core/tests/test_functions.py Fri Oct 24 19:09:04 2008 +0200
@@ -141,6 +141,9 @@
assert Derivative(sin(x), x) != diff(sin(x), x)
assert Derivative(sin(x), x).doit() == diff(sin(x), x)
+
+ f = Function('f')
+ assert Derivative(Derivative(f(x), x), x) == diff(f(x), x, x)
@XFAIL
def test_combine():
diff -r 3a9219d09389 -r d66dc8f1f107 sympy/simplify/tests/test_simplify.py
--- a/sympy/simplify/tests/test_simplify.py Mon Oct 20 17:19:52 2008 +0200
+++ b/sympy/simplify/tests/test_simplify.py Fri Oct 24 19:09:04 2008 +0200
@@ -216,7 +216,6 @@
assert collect(a*D(fx,x) + b*D(fx,x), fx) == (a + b)*D(fx, x)
assert collect(a*fxx + b*fxx , fx) == (a + b)*D(fx, x)
[EMAIL PROTECTED]
def test_collect_D_0():
D = Derivative
f = Function('f')
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