Another good resource is:
ask.sagemath.org
Joal Heagney
On Friday, 12 October 2012 08:37:50 UTC+10, Doaa El-Sakout wrote:
>
> I try to solve an ODE and plot the result as follows,
>
>
> x,t,a=var('x,t,a')
> a=0.29
> x = function('x', t)
> S=desolve(diff(x,t)-x*(1-x)+a*
> (1+sin(2*pi*t)),x,contrib_ode=True,show_method=True)
> S
>
> I found the following
> [[[x(t) == 0, (-0.29*sin(2*pi*t) - 0.29)*u == 0]], 'riccati']
>
> So what is this "u" here and how can I plot this and how the solution
> wrote by this way
> it is not clear what does it mean
> Doaa
>
>
>
>
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