XPRSwriteprob (WRITEPROB)
XPRSwriteprob |
WRITEPROB |
Purpose
Synopsis
int XPRS_CC XPRSwriteprob(XPRSprob prob, const char *filename, const char *flags);
WRITEPROB [-flags] [filename]
Arguments
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prob
|
The current problem.
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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.
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flags
|
Flags, which can be one or more of the following:
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Example 1 (Library)
The following example outputs the current problem in LP format with scrambled vector names to the file
problem_name
.lp.
XPRSwriteprob(prob, "", "ls");
Example 2 (Console)
WRITEPROB -x C:myprob
This instructs the Optimizer to write an MPS matrix to the file
myprob.mat on the
C: drive using hexadecimal numbers.
Further information
1. If
XPRSloadlp,
XPRSloadglobal,
XPRSloadqglobal or
XPRSloadqp 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
XPRSwriteprob (
WRITEPROB). Also if you do an
XPRSreadprob (
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
XPRSwriteprob (
WRITEPROB). To remove the objective row from the matrix when doing an
XPRSreadprob (
READPROB), set
KEEPNROWS to
-1 before
XPRSreadprob (
READPROB).
2. The hexadecimal format is useful for saving the exact internal precision of the matrix.
3.
Warning: If
XPRSreadprob (
READPROB) is used to input a problem, then the input file will be overwritten by
XPRSwriteprob (
WRITEPROB) if a new filename is not specified.
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