> thanks for working on this topis, it is a nice idea to extract
> variables from ODE automatically. I vote also for splitting into two
> patches and if you have problems with this, I can try it to split them
> by myself. Anyway, the ODE patch depends on the mtype interface and
> this interface sho
Hi Yuri,
thanks for working on this topis, it is a nice idea to extract
variables from ODE automatically. I vote also for splitting into two
patches and if you have problems with this, I can try it to split them
by myself. Anyway, the ODE patch depends on the mtype interface and
this interface sho
> ivars = set(dvar.arguments()).intersection(extract_var_from_diff(de))
I forgot to make intersection in first patch. Changes are in the
second one.
It helps us to solve
sage: x,t=var('x
t')
sage:
f=function('f',x)
sage:
g=function('g',t,x)
sage: de=diff(f,x)+f+diff(g,t,x)
sage: desolve(de,f)
(c
> I suggest that you provide two different patches instead of bundling
> all your changes together. One for the desolve fixes, and another one
> for your mtype interface.
>
> Note that each trac ticket should be on one issue only [1].
>
> [1]http://www.sagemath.org/doc/developer/trac.html#reasons-t
Hi Yuri,
Thank you for taking the time to fix the problems you see in the
symbolic module.
On Sun, 28 Mar 2010 10:12:49 -0700 (PDT)
"yuri.k" wrote:
>
> > Did you use hg_sage.add? It is explained
> > here:http://www.sagemath.org/doc/developer/producing_patches.html#quick-me...
>
> No I didn't.
> Did you use hg_sage.add? It is explained
> here:http://www.sagemath.org/doc/developer/producing_patches.html#quick-me...
No I didn't. Thank you for your help. I almost ready with patch.
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Hi,
On Mon, Mar 29, 2010 at 1:46 AM, yuri.k wrote:
> P.S.: If you have any ideas what should I do - please help me to save
> some time.
The first chapter of the Developer's Guide [1] is minimum required
reading for anyone who wants to effectively contribute to Sage.
[1] http://www.sagemath.o
On Sun, Mar 28, 2010 at 10:46 AM, yuri.k wrote:
> On Mar 28, 4:23 pm, "ma...@mendelu.cz" wrote:
>> I got some problems after installing the patch, see the comment at
>> trac.sagemath.org
>
> I added new file sage/symbolic/mtype.py - which is symbolic module.
> (it was marked as ? instead of M in
On Mar 28, 4:23 pm, "ma...@mendelu.cz" wrote:
> I got some problems after installing the patch, see the comment at
> trac.sagemath.org
I added new file sage/symbolic/mtype.py - which is symbolic module.
(it was marked as ? instead of M in patch log)
I think patch does not create new files. I'll t
I got some problems after installing the patch, see the comment at
trac.sagemath.org
On 27 bře, 22:45, "yuri.k" wrote:
> patch added
>
> http://trac.sagemath.org/sage_trac/ticket/8616#comment:3
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patch added
http://trac.sagemath.org/sage_trac/ticket/8616#comment:3
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I add changes to the trac. So it will be possible to autodetect
dependent and independent variables in most cases (actually in all
cases sage is able to solve in this moment).
The same can be done with systems I guess and of course with bug
http://trac.sagemath.org/sage_trac/ticket/7401
Anyone wh
I add changes to the trac. So it will be possible to autodetect
dependent and independent variables in most cases (actually in all
cases sage is able to solve in this moment).
The same can be done with systems I guess and of course with bug
http://trac.sagemath.org/sage_trac/ticket/7401
Anyone wh
I add changes to the trac. So it will be possible to autodetect
dependent and independent variables in most cases (actually in all
cases sage is able to solve in this moment).
The same can be done with systems I guess and of course with bug
http://trac.sagemath.org/sage_trac/ticket/7401
Anyone wh
> -If the constants are different: it is really easy to compute any
> expression of general solutions of equation. And what is better it is
> also really easy to compare two solutions being the same. If sol1-sol2
> is constant then solutions sol1 and sol2 are equal (the same)
> So in my opinion it
> I am not sure if this will work for DE's involving term like y'(a*x
> +b). But if you find a secure method how to find dependent and
> independent variables from derivative, you can also fix
> bughttp://trac.sagemath.org/sage_trac/ticket/7401
Neither Maple nor Maxima can solve the differential
On 22 bře, 14:26, YURi KARADZhOV wrote:
> desolve(eq,y,ivar=x)
>
> which is really annoying. And what is worse - we get a wrong answer
>
> -((a*x - 1)*b*e^(a*x)/a^2 + c*e^(a*x)/a - c)*e^(-a*x)
>
> but the right answer is
>
> -((a*x - 1)*b*e^(a*x)/a^2 + c*e^(a*x)/a - _C1)*e^(-a*x)
>
> where _C1 - a
On 22 bře, 14:26, YURi KARADZhOV wrote:
> I played around with sage and found some problems with desolve command.
> To solve ode diff(y(x),x)+a*y(x)+b*x+c we should first define variables and
> functions
>
> x = var('x')
>
> a,b,c=var('a b c')
>
> y=function('y',x)
>
> eq=diff(y,x)+a*y+b*x+c
>
>
On Tue, Mar 23, 2010 at 10:56 AM, yuri.k wrote:
> Actually I finished the improvements I mentioned. And even more - I
> developed simple type checking and function which return subexpression
> of given expression by given symbolic type.
Thank you for your work.
>
> But I still have questions:
>
Actually I finished the improvements I mentioned. And even more - I
developed simple type checking and function which return subexpression
of given expression by given symbolic type.
But I still have questions:
1. Is there an easy way to check if some class belongs to package in
python?
2. Where s
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