lrs home page
lrslib Ver 6.2 is a self-contained ANSI
C implementation of the reverse search algorithm for vertex
enumeration/convex hull problems and comes with a choice of three arithmetic packages.
Input file formats are compatible with Komei Fukuda's cdd
package. All computations
are done exactly in either multiple precision or fixed
integer arithmetic. Output is not stored in memory, so
even problems with very large output sizes can sometimes be
solved. The program is intended for Unix/Linux platforms, but will
compile using gcc/cygwin on Windows.
Download
New: parallel versions plrs/mplrs offer near linear
speedups for many problems on a wide range of hardware.
Documentation:
User's Guide
lrslib Guide Theoretical Description
Computational
Results Applications
mplrs/plrs Computational
Results (new) mplrs:Theoretical
Description(new)
Drivers:
- lrs:
Converts
an
H-representation
(half-space)
of a polyhedron to a V-representation (vertex/ray) or vice versa.
Estimates the number of vertices/rays or facets of a
polyhedron. Computes the volume of a polytope given by a list of
vertices. Solves LP problems over a polyhedron given by an
H-representation. Compute the Voronoi vertices and rays for an
input set of data points. quickstart
- plrs: C++ wrapper
for lrs that allows for parallelization using the Boost library
on shared memory multi-core machines and is described here
quickstart
talk
- (new in
6.0) mplrs:
C wrapper for lrs that allows for parallelization on clusters of
machines and uses the MPI library quickstart
- redund: Removes redundant
inequalities from an H-representation. Finds the extremal
vertices in a V-representation
- (major revision in 6.1)
lrsnash, 2nash: Computes all Nash
equlibria of a two person non-cooperative game. 2nash is a
2-processor parallel version
- fourier: Temporarily withdrawn due to reported bugs.
Interface:
- Matlab:
GeoCalcLib, an interface
to lrs and redund developed by Rainer Schaich
Libraries:
- lrslib: A
callable library of functions implementing the above drivers
except lrsnash
- lrsnash: A callable
library of routines for computing Nash equilibria (used with
lrslib)
- lrsmp: A multiple
precision arithmetic package for lrslib
- lrslong: A fixed precision
integer package for lrslib
- lrsgmp: A multiple
precision arithmetic package for lrslib based on GNU MP.
Demos:
- vedemo.c Compute vertices of a set of
generated hypercubes
- chdemo.c
Compute
facets
of
a set of generated cyclic polytopes
- lpdemo.c
Solve
a
set
of linear programs for generated hypercubes
Links
to related software
The program can be distributed freely under the
GNU GENERAL PUBLIC LICENSE. Please read the file COPYING
carefully before using.
David
Avis
avis@cs.mcgill.ca
2016.05.27
School of
Informatics, Kyoto University and School of Computer Science, McGill University