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Re: NIntegrate and Plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg95905] Re: NIntegrate and Plot
  • From: dimitris <dimmechan at yahoo.com>
  • Date: Thu, 29 Jan 2009 05:58:11 -0500 (EST)
  • References: <glethi$4pp$1@smc.vnet.net>

On 24 =C9=E1=ED, 13:20, dimitris <dimmec... at yahoo.com> 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.

After a private response I found out that the following make the
things much better.

Plot[NIntegrate[fun[r, t], {t, 0, Infinity}], {r, 0, 3}, MaxRecursion-
>0]



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