For anyone interested, it looks as though the GiNaC project has
released a fix:
http://www.cebix.net/pipermail/ginac-devel/2010-March/001732.html
I've posted this to the dev list as well.
Cheers--
Greg
On Mar 23, 7:00 pm, G B wrote:
> I won't clutter the discussion with the full traceback un
I won't clutter the discussion with the full traceback unless someone
would find it interesting, but the hg_sage command failed with:
TypeError: 'NoneType' object is unsubscriptable.
I did enter the entire URL, I didn't just paste the abbreviated URL
displayed in the post.
On Mar 23, 1:18 am, On
Hi Minh!
On Mon, Mar 22, 2010 at 8:55 PM, Minh Nguyen wrote:
> Hi Greg,
>
> On Tue, Mar 23, 2010 at 9:35 AM, G B wrote:
>> Hi Ondrej--
>>
>> Sorry to turn helpless, but I'm not sure how to apply the patch. I'm
>> working from a binary install for OS X.
>
> Here is a quick-and-dirty way. I assum
Hi Greg,
On Tue, Mar 23, 2010 at 9:35 AM, G B wrote:
> Hi Ondrej--
>
> Sorry to turn helpless, but I'm not sure how to apply the patch. I'm
> working from a binary install for OS X.
Here is a quick-and-dirty way. I assume that you are using Sage 4.3.3
or Sage 4.3.4. From the Sage command line,
Hi Ondrej--
Sorry to turn helpless, but I'm not sure how to apply the patch. I'm
working from a binary install for OS X. Would I need to rebuild from
source, or can I apply the patch to one of the implementation files in
the bundle? It looks like you've just changed a lookup table?
Thanks for
Also, simplification might be improved. In particular,
sage: atan(sin(1)/cos(1)).full_simplify()
arctan(sin(1)/cos(1))
while
atan(tan(1)).simplify()
1
Alec Mihailovs
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On Fri, Mar 19, 2010 at 7:03 PM, Ondrej Certik wrote:
> On Thu, Mar 18, 2010 at 5:10 PM, G B wrote:
>> Thanks. I tried that but it's causing different problems:
>> ---
>> from sympy import atan2
>> var('omega,t,x,y,r,Theta')
>> Theta(t)=omega*t
>> x(t)=r*cos(Theta(t))
>> y(t)
On Thu, Mar 18, 2010 at 5:10 PM, G B wrote:
> Thanks. I tried that but it's causing different problems:
> ---
> from sympy import atan2
> var('omega,t,x,y,r,Theta')
> Theta(t)=omega*t
> x(t)=r*cos(Theta(t))
> y(t)=r*sin(Theta(t))
> dx=diff(x,t)
> ddx=diff(dx,t)
> dy=diff(y,t)
Thanks. I tried that but it's causing different problems:
---
from sympy import atan2
var('omega,t,x,y,r,Theta')
Theta(t)=omega*t
x(t)=r*cos(Theta(t))
y(t)=r*sin(Theta(t))
dx=diff(x,t)
ddx=diff(dx,t)
dy=diff(y,t)
ddy=diff(dy,t)
v_a(t)=atan2(dy(t),dx(t))
v_a
On Mar 17, 8:38 pm, G B wrote:
> atan2(-pi,0) --> RuntimeError: power::eval(): division by zero
>
> Any ideas how to get around this?
A simple workaround is
sage: from sympy import atan2
sage: atan2(-pi,0)
-pi/2
Alec Mihaiovs
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On Mar 17, 9:11 pm, G B wrote:
> atan2(-pi,0) --> RuntimeError: power::eval(): division by zero
I got the same in the new 4.3.4.rc0 Sage version that I've just
installed.
Playing with that, I noticed also the following strange thing:
sage: n(atan2(-sqrt(2),0))
-1/2*pi
While it looks corre
Should have also mentioned:
Sage 4.3.3
OS X 10.6.2
64bit Intel
MacBook Pro
On Mar 17, 5:38 pm, G B wrote:
> While waiting to be approved, I think I narrowed this down to a very
> simple test case.
>
> atan2(3,0) --> 1/2*pi
> atan2(-3,0) --> -1/2*pi
> atan2(pi,0) --> 1/2*pi
> atan2(-pi,0) --
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