On 10 Aug., 03:01, Aaron Meurer asmeu...@gmail.com wrote:
No. Right now, trigsimp() is very weak. It basically just applies
the various forms of sin**2 + cos**2 = 1. Improvements would be
welcome, though.
Rewriting as exp, simplifying, and rewriting as sin is sometimes more
powerful than our
Luke wrote:
I've published my branch of sympy where I started implementing the
trig simplification algorithm by Hu et al. I also started working on
the .eval() methods of sin, cos, and tan, and wrote a lot of tests for
the behavior that Mathematica gives. Currently,
py.test
On Tue, Jun 2, 2009 at 4:48 AM, Fabian Pedregosa fab...@fseoane.net wrote:
Luke wrote:
I've published my branch of sympy where I started implementing the
trig simplification algorithm by Hu et al. I also started working on
the .eval() methods of sin, cos, and tan, and wrote a lot of tests
Ondrej Certik wrote:
On Tue, Jun 2, 2009 at 4:48 AM, Fabian Pedregosa fab...@fseoane.net wrote:
Luke wrote:
I've published my branch of sympy where I started implementing the
trig simplification algorithm by Hu et al. I also started working on
the .eval() methods of sin, cos, and tan, and
Thanks.
On May 25, 9:02 pm, Aaron S. Meurer asmeu...@gmail.com wrote:
You need to use the exclude option I was telling you about. Do,
a = Wild('a', exclude=[pi])
and
b = Wild('a', exclude=[pi]).
and you get
e1.match(a*pi + b)
{a_: 1, b_: x}
b = Wild('b', exclude=[pi])
Aaron,
It seems like this only works for Symbol instances, not
FunctionClass instances, i.e:
from sympy import *
x = Function('x')
a = Wild('a', exclude=[pi])
b = Wild('b')
e = pi/S(2) + x
e.match(a*pi + b)
Traceback (most recent call last):
File stdin, line 1, in module
File
Here is the link for the Maxima trigsimp() code. It was written in
1981, according to the comments!!!
http://maxima.cvs.sourceforge.net/viewvc/maxima/maxima/share/trigonometry/trgsmp.mac?revision=1.4view=markup
I emailed the authors of the Fu et al. paper to see if they would be
willing to
On May 25, 2009, at 11:56 AM, Luke wrote:
Here is the link for the Maxima trigsimp() code. It was written in
1981, according to the comments!!!
http://maxima.cvs.sourceforge.net/viewvc/maxima/maxima/share/trigonometry/trgsmp.mac?revision=1.4view=markup
I emailed the authors of the Fu et
Aaron,
Thanks for the clarification. I think I get the idea, but I'm
having trouble matching expressions of the following form:
a = Wild('a')
b = Wild('b')
x = Symbol('x')
e1 = pi + x
e2 = pi - x
e3 = -pi + x
e4 = -pi - x
I would think that for e{1,2,3,4} that I could get the following
Luke wrote:
Aaron,
Thanks for the clarification. I think I get the idea, but I'm
having trouble matching expressions of the following form:
a = Wild('a')
b = Wild('b')
x = Symbol('x')
e1 = pi + x
e2 = pi - x
e3 = -pi + x
e4 = -pi - x
I would think that for e{1,2,3,4} that I could
You need to use the exclude option I was telling you about. Do,
a = Wild('a', exclude=[pi])
and
b = Wild('a', exclude=[pi]).
and you get
e1.match(a*pi + b)
{a_: 1, b_: x}
b = Wild('b', exclude=[pi])
e2.match(a*pi + b)
{b_: -x, a_: 1}
e3.match(a*pi + b)
{b_: x, a_: -1}
e4.match(a*pi
Luke wrote:
Last night I was deriving the moment of inertia for a solid torus
using Sympy. It mostly worked, except for the step where the
determinant of the Jacobian for the change of variables mapping was to
be computed, the result was unable to be simplified by trigsimp. I
gave it a
On Wed, May 20, 2009 at 7:29 AM, Luke hazelnu...@gmail.com wrote:
Last night I was deriving the moment of inertia for a solid torus
using Sympy. It mostly worked, except for the step where the
determinant of the Jacobian for the change of variables mapping was to
be computed, the result
Incidentally, trying trigsimp with recursive=True, deep=True, or both True
didn't give the desired result.
On Tue, Apr 28, 2009 at 12:22 AM, Luke hazelnu...@gmail.com wrote:
I'm writing some tests for some code that expresses a Vector expression in
the coordinates of a different frame. I am
I think trigsimp is too hack-ish. I'll try implementing the algorithm
given at http://vv.cn/d/d.aspx?Id=21987_1.0.42119 - I guess this is
the one Ondrej was talking about - in the coming weeks. I'm still not
sure how good it is, does anyone know of anything better ?
Akshay
On Apr 28, 6:52 pm,
It isn't too pressing for PyDy, I just ran into it when creating some
tests that would ensure PyDy gave the same output as Autolev. In
Autolev, if you express a UnitVector from one reference in the
coordinates of another reference frame that is 3 or more simple
rotations away, when you convert
Luke wrote:
It isn't too pressing for PyDy, I just ran into it when creating some
tests that would ensure PyDy gave the same output as Autolev. In
Autolev, if you express a UnitVector from one reference in the
coordinates of another reference frame that is 3 or more simple
rotations away,
Freddie Witherden wrote:
Hi all,
I think trigsimp is too hack-ish. I'll try implementing the algorithm
given at http://vv.cn/d/d.aspx?Id=21987_1.0.42119 - I guess this is
the one Ondrej was talking about - in the coming weeks. I'm still not
sure how good it is, does anyone know of anything
I just finished reading this paper. It seems pretty reasonable, and
not to difficult to implement. Does anybody know of any other papers
on this subject that might offer alternative methods that would be
worth looking at? If there was some sort of gold standard paper on
the subject, that might
On Tue, Apr 28, 2009 at 6:17 PM, Alan Bromborsky abro...@verizon.net wrote:
Luke wrote:
I just finished reading this paper. It seems pretty reasonable, and
not to difficult to implement. Does anybody know of any other papers
on this subject that might offer alternative methods that would
On Mon, Nov 10, 2008 at 10:29 PM, Alan Bromborsky [EMAIL PROTECTED] wrote:
How hard would it be to have trigsimp handle hyperbolic trig functions
as well as the ordinary ones?
I think the code should be similar to what is already implemented,
however someone needs to do it. Could you please
Ondrej Certik wrote:
On Mon, Nov 10, 2008 at 10:29 PM, Alan Bromborsky [EMAIL PROTECTED] wrote:
How hard would it be to have trigsimp handle hyperbolic trig functions
as well as the ordinary ones?
I think the code should be similar to what is already implemented,
however someone
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