This is a known bug. Marshall and I tried to fix it during a SageDays in
Seattle but failed to figure out the magic in Robert Bradshaw's code
for desolve. I think it is "easy to fix for those who know how to fix it
easily", but that rules me out:-)
On Sat, Oct 3, 2009 at 3:30 AM, ma...@mendelu.cz <ma...@mendelu.cz> wrote:
>
> Dear sage users and developers
>
> trying to solve y''+4y=0 with initial conditions y(0)=0 and y'(0)=0
>
> y=function('y',x)
> eq=diff(y,x,2)+4*y==0
> desolve(eq,y,ics=[0,0,0])
>
>
> sage returns y(0)*cos(2*x) and not 0
>
> What is wrong? The help for the desolve command shows the same
> behavior on slighhtly more complicated example. I think that if I
> state initial condition at 0, then y(0) is known and I can use this
> knowledge and simplify answer - in my case into 0
>
> Thanks
>
> Robert
> >
>
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