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Mathematica Plot [help]

• To: mathgroup@smc.vnet.net
• Subject: [mg10312] Mathematica Plot [help]
• From: wxu@cs.utexas.edu (Wei Xu)
• Date: Mon, 5 Jan 1998 22:24:30 -0500
• Organization: CS Dept, University of Texas at Austin

Hi,

I'm learning Mathematica. 
I want to draw a surface, say sin[x,y],  defined on a triangular domain,
say, x:[0,1], y:[0,1] and x+y <=1.
I tried to use the following command:
 ParametricPlot3D[{fx, fy, fz}, {x,0,1}, {y,0,1-x}] but it is not
allowed to use {y,0,1-x}.

Anybody can help me out?

Thanks,

Regards,

Wei