Initializing help system before first use

problem.write

problem.write

Purpose
Writes the current problem to an MPS or LP file.
Synopsis
problem.write (filename, flags)
Arguments
filename 
A string of up to 200 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 
(optional) 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 
obsolete flag (now default behavior).
Example
The following example outputs the current problem in full precision, LP format with scrambled vector names to the file problem_name .lp. 
p.write ("", "lps")
Further information
1. If problem.loadproblem is used to obtain a problem then there is no association between the objective function and the N rows in the problem and so a separate N row (called __OBJ___) is created upon a write. Also, if after a call to read either the objective row or the N row in the problem corresponding to the objective row are changed, the association between the two is lost and the __OBJ___ row is created with an write. To remove the objective row from the problem when doing a read, set keepnrows to -1 before read.
2. The hexadecimal format is useful for saving the exact internal precision of the problem.
3. Warning: If problem.read is used to input a problem, then the input file will be overwritten by write if a new filename is not specified.
Related topics
problem.read.

Parent Topic Reference Manual

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