Re: NIntegrate and Plot
- To: mathgroup at smc.vnet.net
- Subject: [mg95766] Re: NIntegrate and Plot
- From: dh <dh at metrohm.com>
- Date: Mon, 26 Jan 2009 06:49:33 -0500 (EST)
- References: <glethi$4pp$1@smc.vnet.net>
Hi Dimitris,
integrate your function before plotting it:
Integrate[fun[r, t], {t, 0, Infinity}, Assumptions -> {r >= 0}]
hope this helps, Daniel
dimitris wrote:
> Hello.
>
> I have the following function
>
> fun[r_, t_] := -(((-3 + 4*t^2 + 8*t^4 - 8*t^3*Sqrt[1 + t^2])*
> BesselJ[1, r*t])/(3 + 14*t^2 + 24*t^4 + 16*t^6 -
> 16*t^3*Sqrt[1 + t^2] - 16*t^5*Sqrt[1 + t^2]))
>
> How can I achieve better performance in the following task
>
> Plot[NIntegrate[fun[r, t], {t, 0, Infinity}], {r, 0, 3}]
>
> Thank you very much.
>