Displaying 20 results from an estimated 400 matches similar to: "Semi continous variable- define bounds using lpsolve"
2004 Jun 22
0
semi-continuous variables in lpSolve package
Hi,
I am working with lpSolve "R" package by Sam Buttrey, buttrey at nps.navy.mil ,
which is interface to lp_solve linear/integer programming system.
You can find information about lp_solve at http://groups.yahoo.com/group/lp_solve/ (free registration required).
lpSolve (R package) supports linear and integer programming but it does not support semi-continuous variables
2006 Feb 23
1
R and marine protected areas: algorithms for site selection
Dear listers,
a central problem in conservation biology is the selection of sites in
reserve network design.
many algorithms have been published, and I was wondering any have been
implemented in R.
I did not seen anything on CRAN or R-help, or on the web in general.
Best regards, Eric
Eric Pante
----------------------------------------------------------------
College of Charleston, Grice
2007 Oct 01
1
lpSolve doesn't compile because of a malloc.h error
Under freebsd 6.2-p7 i386, R 2.5.1,gcc-4.2.2 I'm unable to compile package
lpSolve because:
hpbsd# R CMD INSTALL lpSolve_5.5.8.tar.gz
* Installing to library '/usr/local/lib/R/library'
* Installing *source* package 'lpSolve' ...
** libs
cc -std=gnu99 -I/usr/local/lib/R/include -I/usr/local/lib/R/include -I . -DINTEGERTIME -DPARSER_LP -DBUILDING_FOR_R -DYY_NEVER_INTERACTIVE
2009 Dec 04
2
Solve linear program without objective function
Dear R-users,
i try to solve to following linear programm in R
0 * x_1 + 2/3 * x_2 + 1/3 * x_3 + 1/3 * x_4 = 0.3
x_1 + x_2 + x_3 + x_4 = 1
x_1, x_2, x_3, x_4 > 0,
x_1, x_2, x_3, x_4 < 1
as you can see i have no objective function here besides that i use the
following code.
library(lpSolve)
f.obj<-c(1,1,1,1)
f.con<-matrix(c(0,2/3,1/3,1/3,
1,1,1,1,
2008 Jan 28
1
Package Installation produces "linux/limits.h: No such file or directory" error when installing the lpSolve package
Dear Friends,
I am trying to install a few packages in R and am receiving error messages.
Since the error messages are different, I am posting them separately. The
second error is with the installation of lpSolve.
The core error message is:
========================================================================
In file included from /usr/include/bits/posix1_lim.h:153,
from
2009 Jul 02
1
lpSolve: how to allow variables to become negative
Dear all,
I am interested in solving a MIP problem with binary outcomes and
continuous variables, which ARE NOT RESTRICTED TO BE NEGATIVE. In
particular,
Max {z1,z2,z3,b1} z1 + z2 + z3
(s.t.)
# 7 z1 + 0 z2 + 0 z3 + b1 <= 5
# 0 z1 + 8 z2 + 0 z3 - b1 <= 5
# 0 z1 + 0 z2 + 6 z3 + b1 <= 7
# z1, z2, z3 BINARY {0,1}
# -5<= b1 <=5 (i.e. b1 <= 5; -b1 <= 5 )
Using
2007 Mar 09
1
lpSolve space problem in R 2.4.1 on Windows XP
Hi.
I am trying to use the linear optimizer from package lpSolve in R 2.4.1 on
Windows XP (Version 5.1). The problem I am trying to solve has 2843
variables (2841 integer, 2 continuous) and 8524 constraints, and I have 2 Gb
of memory. After I load the input data into R, I have at most 1.5 Gb of
memory available. If I start the lp with significantly less memory
available (say 1 Gb), I get
2010 Jul 06
1
question about lpSolve package
Hello R users,
I have two quick questions while using "lpSolve" package for linear programming. (1) the result contains both characters and numbers, e.g., Success: the objective function is 40.5, but I only need the number, can I only store the number? (2) How to set boundaries for variables? e.g., all variable are positive.
Thanks a lot!
Xiaoxi
2005 Mar 30
1
Problems with lpSolve/Memory ? R crashes
Hello!
I have a curious problem, which I cannot solve.
With my code I solve thousands of small linear programs with the package lpSolve automatically.
But R crashes sometimes (~always, but always on different linear programs) in a strange way.
For illustration, I tried to prepare a simple example, which shows the nature of the problem.
The function aaa (see below) declares some constants (only in
2009 Sep 17
0
lpSolve constraints don't seem to have an effect
Dear R users,
I would like to optimize a linear approximation of a quadratic function
using lpSolve. My code runs without any error or warning message but the
constraints that I set don't seem to work properly.
Nevertheless, I am certain that my code is somewhere wrong.
I would like to solve the following problem:
max 2x-x^2+y
subject to
2x^2 + 3y^2 <= 6
2>= x,y >= 0
I would
2010 Mar 19
0
lpSolve
Hey,
Anyone who knows what the following error report when calling lp() in
package lpSolve means?
Error: status 3
JT
--
View this message in context: http://n4.nabble.com/lpSolve-tp1599380p1599380.html
Sent from the R help mailing list archive at Nabble.com.
2010 Jan 28
0
lpSolve API - add Vs set
Hi,
Using the package lpSolve API, I need to build a 2000*100000 constraint matrix.
I wonder which method is faster:
(a)
model = make.lp(0,0)
add.constraint(model, ...)
or
(b)
model = make.lp(2000,100000)
set.constraint(model,...)
Thanks
------------
KC
2004 Oct 28
0
About lp.assign in lpSolve package
Hi.
I've tried to execute "example(lp.assign)" in
lpSolve package.
However, this solution seemed not to return correct
answer, all matrix elements were zeros.
Could you give me any "solution" about this?
Regards.
2013 Apr 23
0
lp.transport in package lpSolve
Dear all,
I'm working on a very complex linear optimization problem using the
lp.transport function in lpSolve. My PC has 10 cores, but by default R uses
only one of them.
Is there a straightforward way to make lp.transport use all cores
available? I had a look at "High-performance and parallel computing in R" (
http://cran.r-project.org/web/views/HighPerformanceComputing.html),
2009 Jun 17
0
lpSolve lp const.dir
Hi. In the help page for "lp" in package lpSolve, regarding
"const.dir" it says:
const.dir: Vector of character strings giving the direction of the
constraint: each value should be one of "<," "<=," "=," "==," ">," or
">=". (In each pair the two values are identical.)
I am having trouble understanding
2005 Oct 14
0
arguments of lpSolve
Dear all,
I am a beginner with lpSolve package (and not an expert in the others).
I can not understand why I am doing wrong, and I would be very grateful if
anyone could please help me on this.
I am trying to optimize ("min") the sum of columns/variables, constrained to
>=1. Each column/variables has its weight - given by values at f.obj.
The matrix for numeric constraint
2006 Nov 14
3
lpSolve and mixed signs
Hi R People:
If you have a linear programming problem in which
some of the constraints have the "<=", some
have ">=" and some have "=", all in the same problem,
should the solver work?
I'm having trouble with that. Any help much appreciated!
Sincerely,
Erin Hodgess
mailto: hodgess at gator.uhd.eud
whoops!
mailto: hodgess at gator.uhd.edu
2005 Oct 14
3
zip package
Dear all
I can not understand how to install the package lpsolve_1.1.9.zip
I have read the FAQ and the help pages carefully, but it still not
clear for me.
I have tried the following (and obtained the respective error
messages):
>install.packages("c:/ProgramFiles/R/rw2011/library/lpSolve_1.1.9",destdir="
c:/ProgramFiles/R/rw2011/library/lpSolve")
Mensagem de aviso:
2008 Oct 22
2
suboptimal lp solutions
Hi list,
I want to find the total maximum resources I can spend given a set
allocation proportion and some simple budget constraints.
However, I get suboptimal results via lp and friends (i.e. lpSolve and
simplex in the linprog and boot) .
For example:
library(lpSolve)
proportions = c( 0.46, 0.28, 0.26)
constraints = c( 352, 75, 171)
lp(objective.in = proportions,
const.mat =
2007 Mar 05
2
Linear programming with sparse matrix input format?
Hi.
I am aware of three different R packages for linear programming: glpk,
linprog, lpSolve. From what I can tell, if there are N variables and M
constraints, all these solvers require the full NxM constraint matrix. Some
linear solvers I know of (not in R) have a sparse matrix input format. Are
there any linear solvers in R that have a sparse matrix input format?
(including the