Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!news.cs.indiana.edu!msi.umn.edu!noc.MR.NET!gacvx2.gac.edu!hhdist From: TNAN0@CCVAX.IASTATE.EDU Newsgroups: comp.sys.handhelds Subject: RE: plotting relations Message-ID: Date: 20 Dec 90 12:48:00 GMT Lines: 16 To: handhelds@gac.edu Return-path: To: handhelds@gac.edu X-VMS-To: IN%"handhelds@gac.edu" To Mitch (The guy who wanted to plot f(x,y)=0)... You've read the manuals? Look on page 333... You will see a section on TRUTH plots... Aren't these exactly what you are looking for? It evaluates an expression at each point on the screen, and if it is true, it sets that point. So, enter X^Y-Y^X>0 as your 'eq' and plot using a TRUTH plot. Your f(x,y)=0 will be the border between white and black on the screen... In general, this means that you can plot f(x,y)=0 as f(x,y)>0 and simply use the border as your level curve at 0. I attempted the example that you gave (the x^y=y^x one) and found that the calculator would bomb when it tried to execute > on a complex number... Easily solved... Just try using ABS(X^Y) > ABS(Y^X) instead... I warn you: this is extremely slow... ---Xeno