Re: hi, how can i accomplish this densityplot?
- To: mathgroup at smc.vnet.net
- Subject: [mg107441] Re: hi, how can i accomplish this densityplot?
- From: "Kevin J. McCann" <kjm at KevinMcCann.com>
- Date: Fri, 12 Feb 2010 04:45:36 -0500 (EST)
- References: <hl0r1r$u4$1@smc.vnet.net>
Your code will work if you leave off the underscores in the Density
plot call:
DensitPlot[f[x,y],...
The underscores are only necessary in the function definition to tell
Mathematica that they are variables.
Kevin
??? wrote:
> f[x_, y_] :=
> NIntegrate[
> r0*Exp[-(r0 +
> 2*(x^2 + y^2 + r0^2 +
> 2*r0*((x^2 + y^2)^0.5)*(Cos[theta0]*(y/(x^2 + y^2)^0.5) -
> Sin[theta0]*(x/(x^2 + y^2)^0.5)))^0.5)], {r0, 0,
> Infinity}, {theta0, 0, Pi}]
>
> DensityPlot[f[x_, y_], {x, -2, 2}, {y, -2, 2}]
>
> i entered the code above but mathematica return the error message:
>
> NIntegrate::inumr: The integrand E^(-r0-2 (r0^2+<<1>>+<<1>>+2 r0
> Power[<<2>>] Plus[<<2>>])^0.5) r0 has evaluated to non-numerical
> values for all sampling points in the region with boundaries {{\
> [Infinity],0.},{0,3.14159}}. >>
>
> General::stop: Further output of NIntegrate::inumr will be suppressed
> during this calculation.
>
> what's wrong with my code? please help me! thanks a lot!
>