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Plot3D over a triangular domain

• To: mathgroup at smc.vnet.net
• Subject: [mg58024] Plot3D over a triangular domain
• From: Sergio Miguel Terrazas Porras <sterraza at uacj.mx>
• Date: Thu, 16 Jun 2005 05:37:08 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Tun Myint Aung [TMA at nus.edu.sg] wrote:
 
    I would like to plot a function over a isosceles triangular domain. I
mean Plot3D[function, {x,-1,1},{y, -0.5+0.5x, 0.5-0.5x}]. But I got message
that the limit must be real number. Anyone can help me?
 
I did this using the UnitStep function.
Try Plot3D[UnitStep[y-(-.5+.5x),0.5-0.5x-y]*function,{x,-1,1},{y,-1,1}];
If something does not work I can send you the Notebook.
Regards,
Sergio Terrazas
University of Juarez
Mexico