Purpose
Export the
current LP/MIP problem held in Mosel core (the portion of a problem defined with mpvar and linctr only) to a file.
Synopsis
procedure exportprob(options:integer, filename:string, obj:linctr)
procedure exportprob(options:integer, filename:string)
procedure exportprob(filename:string, obj:linctr)
procedure exportprob(filename:string)
procedure exportprob
Arguments
|
options
|
File format options:
|
EP_MIN
|
|
|
EP_MAX
|
|
|
EP_MPS
|
|
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EP_STRIP
|
|
|
EP_HEX
|
Ouput numbers in hexadecimal when using MPS format
|
Several options may be combined using
+.
|
|
filename
|
Name of the output file. If the empty string
"" is given, output is printed to the standard output (the screen)
|
|
obj
|
Objective function constraint
|
Example
The following prints the current problem to the screen using the default format and with
MinCost as objective function. The second statement exports the problem in LP-format and with scrambled names to the file
prob1.lp maximizing the constraint
Profit:
declarations
MinCost, Profit:linctr
end-declarations
exportprob(0, "", MinCost)
exportprob(EP_MAX+EP_STRIP, "prob1", Profit)
Further information
1.
Problem types: This function exports only the LP/MIP problem directly handled by the Mosel core libraries. It cannot report problem extensions managed by external modules—these are silently ignored. For instance, quadratic constraints, indicator constraints or general constraints provided by the Xpress Optimizer are not shown by this routine: for this type of problems, the module-specific
writeprob routine has to be used instead of
exportprob.
2.
Number format: Except when option
EP_MPS+EP_HEX is used numbers are ouput according to the
realfmt,
txtztol and
zerotol model parameters (see
setparam). Mosel's real number formatting follows C printing format which is different, for example, from the formatting rules applied by Xpress Optimizer, in particular in the module-specific
writeprob routine.
3.
File extension: If the given filename uses the default IO driver (no driver specified) and has no extension, Mosel appends
.lp to it for LP format files and
.mps for MPS format.
4.
Entity names: Normally, local symbols (
i.e. defined in a procedure or function) are replaced by generated names in the exported matrix. However, if the model has been compiled with option
-G, names defined locally to the routine calling
exportprob are used in the exported matrix. Moreover, if a local symbol hides a global one, this symbol is prefixed by '∼'.
5. If the model is compiled with
-G and the control parameter
recloc is set to
true (see
setparam), missing constraint names are replaced by the source location of the constraint definition (
i.e. a combination of the row number, source file name and line number in the file).
6. If no option is provided, the default format is LP for a minimization; if no constraint is given, the current objective (if available) is exported. The matrix is printed to the standard output when this function is used without parameter.
Related topics
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