Initializing help system before first use

XPRSwriteprob (WRITEPROB)

XPRSwriteprob

WRITEPROB

Purpose
Writes the current problem to an MPS or LP file.
Synopsis
int XPRS_CC XPRSwriteprob(XPRSprob prob, const char *filename, const char *flags);
WRITEPROB [-flags] [filename]
Arguments
prob 
The current problem.
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:
h 
single precision of numerical values;
o 
one element per line;
n 
scaled;
s 
scrambled vector names;
l 
output in LP format;
x 
output MPS file in hexadecimal format.
p 
full precision of numerical values (obsolete as this is now default behavior).
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.
Related topics
XPRSreadprob ( READPROB).

Parent Topic Console and Library Functions

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