Re: Restrict domain of Plot3D[]?

*To*: mathgroup at smc.vnet.net*Subject*: [mg13115] Re: Restrict domain of Plot3D[]?*From*: Paul Abbott <paul at physics.uwa.edu.au>*Date*: Tue, 7 Jul 1998 03:44:18 -0400*Organization*: University of Western Australia*References*: <6nn9u1$58g@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

robpeterson at iname.com wrote: > I'm plotting f[x,y] where x+y<1. Presently I'm getting this done by > > Plot3D[ If[ x+y<1 ], f[x,y], 0], {x,0,1}, {y,0,1}] > > Here, the forbidden area where x+y>1 transitions down to the 0 level. > > Things are working OK but the transition looks lousy. > > Is there some way to just stop the plotting at the boundary where x+y > become 1? Or, some other method ? > > Any clues will be greatly appreciated. An answer for this appeared in The Mathematica Journal 5(1):15. Change variables and reparametrise y: ParametricPlot3D[{x,u (1-x),f[x,u (1-x)]},{x,0,1},{u,0,1}]; Here y -> u (1-x) and u:[0,1]. Cheers, Paul ____________________________________________________________________ Paul Abbott Phone: +61-8-9380-2734 Department of Physics Fax: +61-8-9380-1014 The University of Western Australia Nedlands WA 6907 mailto:paul at physics.uwa.edu.au AUSTRALIA http://www.pd.uwa.edu.au/~paul God IS a weakly left-handed dice player ____________________________________________________________________