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TSP (version 0.1-2)

TSPLIB: Read and write TSPLIB files

Description

Reads and writes TSPLIB format files. TSPLIB files can be used by most TSP solvers. Sample instances for the TSP in TSPLIB format are available on the TSPLIB homepage (see references).

Usage

write_TSPLIB(x, file, precision = 6, inf = NULL)
read_TSPLIB(file, precision = 0)

Arguments

x
an object of class TSP.
file
file name or a connection.
precision
controls the number of decimal places used to represent distances (see details). This argument is ignored and x is used as is if x already is integer.
inf
replacement value for Inf (TSPLIB format cannot handle Inf). If inf is NULL, the default value of 2 times the maximum value in x (ignoring the infinity entries) is used.

Value

  • read_TSPLIB returns an object of class TSP.

Details

In the TSPLIB format distances are represented by integer values. Therefore, if x contains double values (which is normal in R) the values given in x are multiplied by $10^{precision}$ before coercion to integer. Note that therefore all results produced by programs using the TSPLIB file as input need to be divided by $10^{precision}$ (i.e., the decimal point has to be shifted precision placed to the left).

References

TSPLIB home page http://www.iwr.uni-heidelberg.de/groups/comopt/software/TSPLIB95/