Re: ImplicitPlot errors

*To*: mathgroup at smc.vnet.net*Subject*: [mg75147] Re: ImplicitPlot errors*From*: dimitris <dimmechan at yahoo.com>*Date*: Wed, 18 Apr 2007 05:08:01 -0400 (EDT)*References*: <evvbfs$9q5$1@smc.vnet.net><f0142t$8n5$1@smc.vnet.net>

Hi Andrzej. Simply I can't remember it if I have discovered it by myself or see somewhere. Sorry but my memory does not help here! Dimitris Andrzej Kozlowski <akoz at mimuw.edu.pl> wrote: On 17 Apr 2007, at 09:16, dimitris wrote: > Hi. > > Quit; > Is Quit documented anywhere or you just discover it by accident? Quit [] is of course a documented Mathematica function while Quit seems to be an undocumented symbol. To me the fact that it works seems illogical and aesthetically displeasing. (The same applies to Exit[] and Exit). Andrzej Kozlowski =CF/=C7 dimitris =DD=E3=F1=E1=F8=E5: > Hi. > > Quit; > > << "Graphics`ImplicitPlot`" > > ImplicitPlot[{x^2 + x*y + y^2 == 7, y == 2*Sqrt[7/3]}, {x, -5, 5}] > (*works*) > > ImplicitPlot[x+y==2,{x,-4,4}] > (*works*) > > Dimitris > > > =CF/=C7 David Rees =DD=E3=F1=E1=F8=E5: > > Hi, > > > > I've been trying to get ImplicitPlot to plot an implicit function (natu= ra= > lly > > ;) ), but it throws errors to cryptic for me, even when copying and pas= ti= > ng > > from the Mathematica function reference. > > > > In[40]:= ImplicitPlot[{x^2 + x*y + y^2 == 7, y == 2*Sqrt[7/3]= },= > {x, -5, 5}] > > > > ImplicitPlot::var : > > > > Equation x^2+x > > Function[x,x^2+2xy-3y^2-16]+Function[x,x^2+2xy-3<<1>>-16]^2==7 does= n= > ot have > > a single variable other than x > > > > ImplicitPlot::var : > > > > Equation Function[x,x^2+2xy-3y^2-16]==2Sqrt(7/3) does not have a si= ng= > le > > variable other than x > > > > Out[40]:=\!\(ImplicitPlot[{x\^2 + x\ Function[x, x\^2 + 2\ > > xy - 3\ y\^2 - 16] + Function[ > > x, x\^2 + 2\ xy - 3\ y\^2 - 16]\^2 == 7, Function[x, = x\= > ^2 + 2\ > > xy - 3\ y\^2 - 16] == 2\ \@\(7\/3\), x == 2\ \@\(= 7\= > /3\)}, {x, > > \ > > \(-5\), 5}, {Function[x, x\^2 + 2\ xy - 3\ y\^2 - 16], \(-5\), 5}]\) > > > > > > > > What am I doing wrong? Even fails. > > > > Thanks