problem.writesol

Purpose

Writes the current solution to a CSV format ASCII file, problem_name .asc (and .hdr).

Synopsis

problem.writesol (filename, flags)

Arguments

filename

A string of up to 200 characters containing the file name to which the solution is to be written. If omitted, the default problem_name will be used. The extensions .hdr and .asc will be appended.

flags

(optional) Flags to control which optional fields are output:

s	sequence number;
n	name;
t	type;
b	basis status;
a	activity;
c	cost (columns), slack (rows);
l	lower bound;
u	upper bound;
d	dj (column; reduced costs), dual value (rows; shadow prices);
r	right hand side (rows).

If no flags are specified, all fields are output.
Additional flags:

e	outputs every MIP or goal programming solution saved;
p	outputs in full precision;
q	only outputs vectors with nonzero optimum value;
x	output the current LP solution instead of the MIP solution.

Example

In this example the basis status is output (along with the sequence number) following optimization:

p.read ("prob1", "")
p.lpoptimize ("")
p.writesol ("", "sb")

Further information

1. The command produces two readable files: filename.hdr (the solution header file) and filename.asc (the CSV foramt solution file). The header file contains summary information, all in one line. The ASCII file contains one line of information for each row and column in the problem. Any fields appearing in the .asc file will be in the order the flags are described above. The order that the flags are specified by the user is irrelevant.

2. Additionally, the mask control OUTPUTMASK may be used to control which names are reported to the ASCII file. Only vectors whose names match OUTPUTMASK are output. OUTPUTMASK is set by default to " ????????", so that all vectors are output.

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problem.writesol

problem.writesol