On Feb 1, 2009, at 3:42 PM, David Joyner wrote:
> On Sun, Feb 1, 2009 at 5:34 PM, Christophe Deroulers
> wrote:
>>
>
>>
>> When one looks at what Sage sends to Maxima when "desolve(diff(y,x,
>> 2)+y(x)==0,y,[0,3,2])" is called, it turns out that Maxima receives
>> something like
>>
>> my_ode: d
On Sun, Feb 1, 2009 at 5:34 PM, Christophe Deroulers
wrote:
>
>
> When one looks at what Sage sends to Maxima when "desolve(diff(y,x,
> 2)+y(x)==0,y,[0,3,2])" is called, it turns out that Maxima receives
> something like
>
> my_ode: diff('y(x),x,2) + 'y(x) = 0;
> my_sol: ode2(my_ode, 'y(x), x);
On Jan 21, 3:05 am, David Joyner wrote:
> (However, for other problems, this trick will not work so well.)
> I know about the problem with desolve and don't know how
> to "fix" it (though, it is actually documented that way, as you will see if
> you type desolve?). Sorry.
I guess you know all t
calcp...@aol.com wrote:
> In a message dated 1/20/2009 9:37:38 P.M. Eastern Standard Time,
> wdjoy...@gmail.com writes:
>
> (The notation diff(y,t,t) comes from the notation for partial
> derivatives,
> I think.)
diff(y,t,t) is just a shortcut for diff(diff(y,t),t). If you do diff?
In a message dated 1/20/2009 9:37:38 P.M. Eastern Standard Time,
wdjoy...@gmail.com writes:
(The notation diff(y,t,t) comes from the notation for partial derivatives,
I think.)
That's odd since the given DiffEqu to solve was and ODE, not a PDE, right?
TIA,
A. Jorge Garcia
calcp...@a
On Tue, Jan 20, 2009 at 9:30 PM, wrote:
> In a message dated 1/20/2009 9:05:58 P.M. Eastern Standard Time,
> wdjoy...@gmail.com writes:
>
> sage: t = var('t')
> sage: x = function('x',t)
> sage: DE = lambda y: diff(y,t,t) + y
> sage: f = eval(desolve_laplace(DE(x(t)), ["t","x"], [0,1,0]))
> sage
In a message dated 1/20/2009 9:05:58 P.M. Eastern Standard Time,
wdjoy...@gmail.com writes:
sage: t = var('t')
sage: x = function('x',t)
sage: DE = lambda y: diff(y,t,t) + y
sage: f = eval(desolve_laplace(DE(x(t)), ["t","x"], [0,1,0]))
sage: f(t)
cos(t)
OK, I saw this in the DiffEqu te
In this case, the following works:
sage: t = var('t')
sage: x = function('x',t)
sage: DE = lambda y: diff(y,t,t) + y
sage: f = eval(desolve_laplace(DE(x(t)), ["t","x"], [0,1,0]))
sage: f(t)
cos(t)
(However, for other problems, this trick will not work so well.)
I know about the problem with deso
