Status: Accepted
Owner: asmeurer
Labels: Type-Defect Priority-Medium Simplify NeedsReview
New issue 1565 by asmeurer: powsimp() does not combine exponents in some
cases.
http://code.google.com/p/sympy/issues/detail?id=1565
powsimp does not combine exponents correctly in the following case,
Comment #2 on issue 1552 by asmeurer: documentation; Gotchas and Pitfalls
http://code.google.com/p/sympy/issues/detail?id=1552
I also added a warning about things like Rational(1, x) in the same branch,
so repull.
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Status: PassedReview
Labels: -NeedsReview
Comment #3 on issue 1552 by asmeurer: documentation; Gotchas and Pitfalls
http://code.google.com/p/sympy/issues/detail?id=1552
It has been merged in. Thanks Ondrej.
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Status: Accepted
Owner: asmeurer
Labels: Type-Enhancement Priority-Medium Integration
New issue 1566 by asmeurer: Allow Integral to be evaluated at only an upper
limit
http://code.google.com/p/sympy/issues/detail?id=1566
Sometimes, you want to represent an unevaluated integral evaluated at
Hi. Ondrej will probably have better answers to your questions when
he replies, but here is my take.
On Jul 29, 2009, at 9:57 PM, Marco wrote:
I was very impressed by the description of SymPy here:
http://www.euroscipy.org/presentations/slides/index.html
and especially slide 14
I'd like to be able to calculate symbolic Sums (finite and infinite).
From searches of this discussion group, it's clear that this can be
done, but I can't find any relevant documentation. Any pointers will
be appreciated.
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On Thu, Jul 30, 2009 at 12:34 AM, Phillip M.
Feldmanpfeld...@verizon.net wrote:
I'd like to be able to calculate symbolic Sums (finite and infinite).
From searches of this discussion group, it's clear that this can be
done, but I can't find any relevant documentation. Any pointers will
be
Hi,
On Thu, Jul 30, 2009 at 12:15 AM, Aaron S. Meurerasmeu...@gmail.com wrote:
Hi. Ondrej will probably have better answers to your questions when
he replies, but here is my take
Aaron's replies are excellent. Some comments below:
On Jul 29, 2009, at 9:57 PM, Marco wrote:
I was very
On Jul 30, 2:52 pm, Ondrej Certik ond...@certik.cz wrote:
We are missing good documentation for this, but look here for tons of
examples how to evaluate sums symbolically and numerically:
sympy/concrete/tests/test_sums_products.py
Ondrej
BTW: What about using sum_ or Sum instead of
On Thu, Jul 30, 2009 at 7:55 AM, Vinzent
Steinbergvinzent.steinb...@googlemail.com wrote:
On Jul 30, 2:52 pm, Ondrej Certik ond...@certik.cz wrote:
We are missing good documentation for this, but look here for tons of
examples how to evaluate sums symbolically and numerically:
Would your routine help any for the expression in issue 1562?
simplify() doesn't do anything to it because Poly.cancel() doesn't
cancel the sin and cos terms. The same for factor.
I'm happy to report that factor is able to do the heavy lifting after
you polify the expression you asked about
Marco wrote:
I was very impressed by the description of SymPy here:
http://www.euroscipy.org/presentations/slides/index.html
and especially slide 14 Internals: Object oriented model.
I have a couple of general questions about how Object-oriented SymPy
is. I'm a mathematician and would
Hi,
On Thu, Jul 30, 2009 at 07:43:43AM -0700, smichr wrote:
Would your routine help any for the expression in issue 1562?
simplify() doesn't do anything to it because Poly.cancel() doesn't
cancel the sin and cos terms. The same for factor.
I'm happy to report that factor is able to
The problem is that the current problem with Poly breaks thinks which depend
on it. For us, it breaks calculation of eigenvalues...Is it possible to
exclude symbols which are not in the polynomial variable? Right now, it
seems to decompose all symbols
Thanks,
William
On Thu, Jul 30, 2009
Hi,
On Thu, Jul 30, 2009 at 11:23:53AM -0400, william ratcliff wrote:
The problem is that the current problem with Poly breaks thinks which depend
on it. For us, it breaks calculation of eigenvalues...Is it possible to
exclude symbols which are not in the polynomial variable? Right now, it
On Jul 29, 12:06 am, wflynny wfly...@gmail.com wrote:
While finding eigenvalues for a matrix of mine, I ran into a
polynomial decompose error. It seems that when a polynomial has both a
cubic and quartic term and coefficients that consist of symbols,
factortools.py runs into trouble. To
On Jul 30, 2009, at 9:05 AM, Mateusz Paprocki wrote:
Hi,
On Thu, Jul 30, 2009 at 07:43:43AM -0700, smichr wrote:
Would your routine help any for the expression in issue 1562?
simplify() doesn't do anything to it because Poly.cancel() doesn't
cancel the sin and cos terms. The same for
Something must be missing from that URL (I've tried various prefixes,
but couldn't make any of them work).
Phillip
We are missing good documentation for this, but look here for tons of
examples how to evaluate sums symbolically and numerically:
sympy/concrete/tests/test_sums_products.py
I hate underscores, but Sum with a capital S seems reasonable. When
doing the import, one could choose to import SymPy.sum as Sum, but it
would be more convenient to be able to do 'from SymPy import *' and
get everything at one shot.
BTW: What about using sum_ or Sum instead of overwriting
On Thu, Jul 30, 2009 at 12:53 PM, Phillip M.
Feldmanpfeld...@verizon.net wrote:
Something must be missing from that URL (I've tried various prefixes,
but couldn't make any of them work).
I mean the path in the sympy checkout or tarball.
Ondrej
Phillip
We are missing good documentation
On Thu, Jul 30, 2009 at 11:56 AM, Phillip M. Feldman
pfeld...@verizon.netwrote:
I hate underscores, but Sum with a capital S seems reasonable. When
doing the import, one could choose to import SymPy.sum as Sum, but it
would be more convenient to be able to do 'from SymPy import *' and
get
I tried to construct a simple sum based on the examples in
test_sums_products.py; here's my code:
from sympy import *
n= Symbol('n', integer=True)
print Rational(1,2)+Rational(1,3)+Rational(1,4)
print sum(Rational(1,n), (n, 2, 4))
The first print statement gives the correct result, 13/12.
The
On Thu, Jul 30, 2009 at 4:31 PM, Phillip M. Feldmanpfeld...@verizon.net wrote:
I tried to construct a simple sum based on the examples in
test_sums_products.py; here's my code:
from sympy import *
n= Symbol('n', integer=True)
print Rational(1,2)+Rational(1,3)+Rational(1,4)
print
I think this should be in the Gotchas and Pitfalls documentation.
Pull from http://github.com/asmeurer/sympy/tree/doc-day, which already
has a typo fix (see Issue 1552).
Aaron Meurer
On Jul 30, 2009, at 4:40 PM, Ondrej Certik wrote:
On Thu, Jul 30, 2009 at 4:31 PM, Phillip M.
When I type something like the following, I would expect to get a
result of oo, indicating that the sum diverges to infinity:
sum(1/n, (n, 2, oo))
Instead, I get the same thing back (actually not quite-- the 's'
changes to a capital 'S'). Any idea why this doesn't work?
The arguments of Rational have to be literal integers (Python ints or
SymPy Integers). See
http://docs.sympy.org/gotchas.html#python-numbers-vs-sympy-numbers
(by the way Ondrej, when does that become updated with what you just
merged?). So 2 and 3 are correct, while 1 and 4 are
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