Re: Linear Programming

*To*: mathgroup at smc.vnet.net*Subject*: [mg51011] Re: [mg50977] Linear Programming*From*: DrBob <drbob at bigfoot.com>*Date*: Fri, 1 Oct 2004 04:49:20 -0400 (EDT)*References*: <200409300852.EAA26529@smc.vnet.net>*Reply-to*: drbob at bigfoot.com*Sender*: owner-wri-mathgroup at wolfram.com

This works, but it throws a meaningless error first: NMinimize[{x + y, x >= 5, y >= 5, 3*x >= 5*y, {x, y} \[Element] Integers}, {x, y}] \!\(\* RowBox[{\(NMinimize::"incst"\), \(\(:\)\(\ \)\), "\<\"\\!\\(NMinimize\\) was unable to generate any initial points satisfying the inequality constraints \ \\!\\({\\(\\(\\(\\(\\(\\(-3\\)\\)\\\\ \\(\\(Round[x]\\)\\)\\)\\) + \ \\(\\(5\\\\ \\(\\(Round[y]\\)\\)\\)\\)\\)\\) ? 0}\\). The initial region \ specified may not contain any feasible points. Changing the initial region or \ specifying explicit initial points may provide a better solution. \ \\!\\(\\*ButtonBox[\\\"More?\\\", ButtonStyle->\\\"RefGuideLinkText\\\", \ ButtonFrame->None, ButtonData:>\\\"NMinimize::incst\\\"]\\)\"\>"}]\) {14., {x -> 9, y -> 5}} Perhaps somebody out there can explain why this error message is "a good thing"? Bobby On Thu, 30 Sep 2004 04:52:32 -0400 (EDT), Rodrigo Malacarne <malacarne at gmail.com> wrote: > Hi everybody, > > How can I insert a constraint in the following expression > > ConstrainedMin[x+y,{x>5,y>5,3x>5y},{x,y}] > > to find only integer results? Using the expression above I get > > {13.3333,{x->8.3333,y->5.}} > > but I want x to be an integer number. > > Cordially yours, > Rodrigo > > > > -- DrBob at bigfoot.com www.eclecticdreams.net

**Follow-Ups**:**Re: Re: Linear Programming***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>