read_qaplib
From qap v0.1-0
by Michael Hahsler
Read QAPLIB Files
Reads example file in the format used by QAPLIB.
- Keywords
- manip
Usage
read_qaplib(file)Arguments
- file
- file name.
Details
Problems end with the extension .dat and solutions with .sln.
The code tries to read the problem and, if available in the same directory,
it also reads the solution and the known optimal value from the
solution file.
The package contains a copy of the problem instances and solutions
from QAPLIB. The data is stored in the package in directory qaplib.
Value
-
Returns a list with the components
- D
- distance matrix.
- W
- weight matrix.
- solution
- a known optimal solution (if available).
- opt
- known optimal value (if available).
References
R.E. Burkard, E. Cela, S.E. Karisch and F. Rendl, QAPLIB - A Quadratic Assignment Problem Library, http://anjos.mgi.polymtl.ca/qaplib/
Examples
## load a QAPLIB problem instance
p <- read_qaplib(system.file("qaplib", "had12.dat", package="qap"))
p
## list all QAPLIB instances
dir(system.file("qaplib", package="qap"), pattern = "*.dat")
Community examples
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