[MUG] Problem with inequal

[MUG] Re: Problem with inequal
Author: Maple User Group    Posted: Fri, 18 Oct 2002 17:25:00 -0400
>> From: Maple User Group "maple_gr" | >> From: Dean Bernsten "dbernsten" | Could anybody troubleshoot this? Thanks! | | inequal( { 4*x+y^2 >= 1}, x=-5..5, | y=-5..5,optionsfeasible=(color=grey),optionsexcluded=(color=white) ); | Error, (in plots/inequal/clip) selecting function must return true or | false -=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=- From: "Robert J. Lopez" "Robert.J.Lopez" To: "maple-list" Subject: Problem with inequal Date: Tue, 15 Oct 2002 14:09:01 -0500 My reading of the help file for the inequal command is that only linear inequalities in 2 variables work. RJL Robert J. Lopez Department of Mathematics Rose-Hulman Institute of Technology Terre Haute, IN 47803 812 877-8396 (office) 812 877-8883 (fax) "Robert.J.Lopez" -=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=- Date: Tue, 15 Oct 2002 13:45:40 -0700 (PDT) From: Robert Israel "israel" To: "maple-list" Subject: Problem with inequal "inequal" is for systems of linear inequalities; yours is nonlinear. You might try "inequalities" from my Maple Advisor Database, http://www.math.ubc.ca/~israel/advisor Robert Israel "israel" Department of Mathematics http://www.math.ubc.ca/~israel University of British Columbia Vancouver, BC, Canada V6T 1Z2 -=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=- From: Douglas Wilhelm Harder "douglas" Subject: Problem with inequal To: "maple-list" Date: Tue, 15 Oct 2002 17:09:34 -0400 (EDT) >From the help page: - The inequalities are linear inequalities in two unknown variables. The message could be better though... Cheers, Douglas -- Douglas Wilhelm Harder -: 3- -.- =.- -: -3 .* =. -:- :- . -: .= -:- * -:- -. Department of Electrical and Computer Engineering http://ece.uwaterloo.ca/ University of Waterloo http://cheetah.vlsi.uwaterloo.ca/~dwharder/ .___ DC 2703 519-885-1211 x7023 http://links.uwaterloo.ca/ \ ."""". .-----._____.-----._______.-----._____.-----._____.-- \____/ --10-- http://www.scg.uwaterloo.ca/ http://mapleapps.com/ -=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=- Date: Thu, 17 Oct 2002 12:51:51 -0400 (EDT) From: Carl Devore "devore" To: "maple-list" Subject: Problem with inequal inequal only works on linear inequalities. If nonlinear inequalities were allowed, just determining the number of regions would be a challenge, let alone shading some of the (generally nonconvex) regions. You can get the desired plot as plots[display]( plot(expand([-1,1]*sqrt(1-4*x)), x= -5..5, color= white, filled= true) ,plot([-5,5], x= -5..5, color= grey, filled= true) ); -=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=- From: "Peter Weigand" "peter.weigand" To: "maple-list" Date: Fri, 18 Oct 2002 13:04:19 +0200 Subject: Problem with inequal Dear Dean, inequal plots regions defined by linear(!!) inequalities (see Maple help) Peter On 12 Oct 2002 at 19:43, Dean Bernsten wrote: ----------------------------------------------------- Dr. Peter Weigand, Chemnitz University of Technology Faculty of Mathematics Mail :D-09107 Chemnitz, Germany Phone: +49 0371 531 2655 Fax : +49 0371 531 4947 E-mail: "weigand" _____________________________________________________

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