Re: Plotting a parametric equation

*To*: mathgroup at smc.vnet.net*Subject*: [mg111546] Re: Plotting a parametric equation*From*: Peter Pein <petsie at dordos.net>*Date*: Wed, 4 Aug 2010 07:40:09 -0400 (EDT)*References*: <i3bd5l$ph5$1@smc.vnet.net>

Am Wed, 4 Aug 2010 09:50:45 +0000 (UTC) schrieb Mapsread <cw_chw at yahoo.com>: > Greetings, > > I would like to see the graph of u=.5(x+y), v=.5(x-y), w= z - .5(x^2 - > y^2). > > I entered this into the command-line of Mathematica: > > ParametricPlot3D[{0.5` (x + y), 0.5` (x - y), > z - 0.5` (x^2 - y^2)}, {x, -1000000, 1000000}, {y, -1000000, > 1000000}] > > All I get is a big empty box spanning from -1 to 1 on all sides. Is > there something I need to do to make this work? > a value for z > TIA > > P.S. For some reason, Mathematica changes my "*" symbols to "'" > symbols. Does ' mean multiply? > Look in the documentation for "Precision". Cheers, Peter