On Tue, Jan 21, 2020 at 1:00 PM mendes <mendes...@gmail.com> wrote:
>
> Dear all,
>
> In previous versions of Sage I was able to do very quickly some numerical
> integrations involving unit_step(t) function .
>
> But, in the last updates (8.9 and 9.0) , it takes 6 times longer to do the
> numerical integral of convolution with unit_step(), than to do the same
> operation with a gaussian function.
>
> It does not seem to be o.k., comparing the simplicity of unit_step() with
> the gaussian $e^{-t^2}$.
>
> #Compare:
>
> var('x,t')
> f= e^(-(t-1)^2)
> g= sin(t)
> fg= lambda t: numerical_integral(f(t=x)*g(t=t-x),0,t,params=[0])[0]
> plot(fg,t,0,3)
>
>
> #with:
>
> var('x,t')
> f= unit_step(t-1)
> g= sin(t)
> fg= lambda t: numerical_integral(f(t=x)*g(t=t-x),0,t,params=[0])[0]
> plot(fg,t,0,3)
>
>
> Thanks for your attention.
yes, in my tests it's even worse than 6 times slower.
Open a trac ticket?
>
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