Restriction on the domain of Plot3D

• To: mathgroup at smc.vnet.net
• Subject: [mg55385] Restriction on the domain of Plot3D
• From: "Steeve Brechmann \(schumi\)" <steevebrechmann at yahoo.ca>
• Date: Mon, 21 Mar 2005 03:01:52 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

```Hi everyone,

I want to plot the following function with Plot3D :

eqt[q_,N_,M_]:= -
(3*q/(8*Pi))*(Sum[(Cos[4*Pi*n*d]/(2*n*d))-(Sin[4*Pi*n*d]/(8*Pi*(n*d)^2))-(Cos[4*Pi*n*d]/(32*Pi^2*(n*d)^3)),{n,1,N}] -
Sum[(Cos[4*Pi*Abs[z0-m*d]]/Abs[z0-m*d])-(Sin[4*Pi*Abs[z0-m*d]]/(4*Pi*Abs[z0-m*d]^2))-(Cos[4*Pi*Abs[z0-m*d]]/(16*Pi^2*Abs[z0-m*d]^3)),{m,-M,M}])

Plot3D[Evaluate[eqt[1,10,10]],{z0,10^ - 6,3},{d,1/10,6},PlotPoints->50];

But, how can i specify to Mathematica, that i want just the plot for 2*zz0 < dd ?

Thanks for the help !

Steeve Brechmann
Physics Department, Laval University
steevebrechmann at yahoo.ca

```

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