Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2007
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

Maximize with Integer constraints

  • To: mathgroup at smc.vnet.net
  • Subject: [mg78227] Maximize with Integer constraints
  • From: "sdw" <warwick at jps.net>
  • Date: Tue, 26 Jun 2007 04:33:18 -0400 (EDT)

given entry #1:


Maximize[
{x1 + x2 + x3 + x4,
Element[x1 | x2 | x3 | x4 , Integers] &&
0 <= x1 <= 5.6 &&
0 <= x2 <= 8.6 &&
0 <= x3 <= 9.7 &&
4.0 <= x4 <= 22.4 }, {x1, x2, x3, x4}]

{4., {x1 -> 0, x2 -> 0, x3 -> 0, x4 -> 4}}

note -  zeros for answers
entry #2:
Maximize[
{x1 + x2 + x3 + x4,
Element[x1 | x2 | x3 | x4 , Integers] &&
0 <= x1 <= 5.6 &&
0 <= x2 <= 8.6 &&
0 <= x3 <= 9.7 &&
4.1 <= x4 <= 22.4 }, {x1, x2, x3, x4}]

{44., {x1 -> 5, x2 -> 8, x3 -> 9, x4 -> 22}}

note good answers...
only difference is 4.1 vs. 4 in constraints
any ideas what is going on?

thanks,

sdw 



  • Prev by Date: Re: PlotLegend and ListPlot
  • Next by Date: Data Export to Excel, Reals or now Strings?
  • Previous by thread: Re: extracting fractional powers of series expansion?
  • Next by thread: Re: Maximize with Integer constraints