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ploting piecewise function in contourplot3d section

• To: mathgroup at smc.vnet.net
• Subject: [mg111664] ploting piecewise function in contourplot3d section
• From: kamal <azimikamal at gmail.com>
• Date: Mon, 9 Aug 2010 05:15:07 -0400 (EDT)

hi, i want plot
 x - .5*(y + z) = (250*10^6) when y < .5*(x + z)
 .5*(y + x) - z = (250*10^6) when y >= .5*(x + z)

how can i do that in contourplot3d