Purpose
Writes the current problem to an MPS or LP file.
Topic area
File IO
Synopsis
problem.writeProb(filename="", flags="")
Arguments
|
filename
|
A string of up to
MAXPROBNAMELENGTH characters to contain the file name to which the problem is to be written. If omitted, the default
problem_name is used with a
.mps extension, unless the
l flag is used in which case the extension is
.lp.
|
|
flags
|
Flags, which can be one or more of the following:
|
o
|
one element per line;
|
|
n
|
output the scaled problem;
|
|
s
|
scrambled vector names;
|
|
l
|
output in LP format;
|
|
p
|
output values in full precision (obsolete as this is now default behavior);
|
|
t
|
omit the Xpress header in LP or MPS format;
|
|
v
|
use the provided filename verbatim, without appending the
.mps or
.lp extension;
|
|
z
|
compress the output file.
|
|
Further information
1. If
problem.loadLP,
problem.loadMIP,
problem.loadMIQP or
problem.loadQP is used to obtain a matrix then there is no association between the objective function and the
N rows in the matrix and so a separate
N row (called
__OBJ___) is created when you do an
problem.writeProb. Also if you do an
problem.readProb and then change either the objective row or the
N row in the matrix corresponding to the objective row, you lose the association between the two and the
__OBJ___ row is created when you do an
problem.writeProb. To remove the objective row from the matrix when doing an
problem.readProb, set
KEEPNROWS to
-1 before
problem.readProb.
2.
Warning: If
problem.readProb is used to input a problem, then the input file will be overwritten by
problem.writeProb if a new filename is not specified.
3. The Optimizer can write compressed matrix files in the following formats, as long as the command-line tool necessary to compress the file can be located in the path:
bzip2,
xz,
lzma,
Z,
zip,
tar,
tgz. The Optimizer has built-in support for the
gz format: no external tools are necessary to write gzipped matrix files.
Related topics
© 2001-2025 Fair Isaac Corporation. All rights reserved. This documentation is the
property of Fair Isaac Corporation (“FICO”). Receipt or possession of this documentation does not
convey rights to disclose, reproduce, make derivative works, use, or allow others to use it except
solely for internal evaluation purposes to determine whether to purchase a license to the software
described in this documentation, or as otherwise set forth in a written software license agreement
between you and FICO (or a FICO affiliate). Use of this documentation and the software described in
it must conform strictly to the foregoing permitted uses, and no other use is permitted.
