File Types
The Optimizer generates or inputs a number of files of various types as part of the solution process. By default these all take file names governed by the problem name (problem_name), but distinguished by their three letter extension. The file types associated with the Optimizer are as follows:
| Extension | Description | File Type |
|---|---|---|
| .alt | Matrix alteration file, input by XPRSalter (ALTER). | ASCII |
| .asc | CSV format solution file, output by XPRSwritesol (WRITESOL). | ASCII |
| .bss | Basis file, output by XPRSwritebasis (WRITEBASIS), input by XPRSreadbasis (READBASIS). | ASCII |
| .csv | Output file, output by XPRSiiswrite. | ASCII |
| .dir | Directives file (MIP only), input by XPRSreaddirs (READDIRS). | ASCII |
| .glb | Global file (MIP only), used by XPRSglobal (GLOBAL). | Binary |
| .hdr | Solution header file, output by XPRSwritesol (WRITESOL). | ASCII |
| .lp | LP format matrix file, input by XPRSreadprob (READPROB). | ASCII |
| .mps | MPS / XMPS format matrix file, input by XPRSreadprob (READPROB). | ASCII |
| .prt | Fixed format solution file, output by XPRSwriteprtsol (WRITEPRTSOL). | ASCII |
| .sol | Solution file created by XPRSwritebinsol (WRITEBINSOL). | Binary |
| .slx | Solution file created by XPRSwriteslxsol (WRITESLXSOL). | ASCII |
| .xtm | Tuner method created by XPRStunerwritemethod. | ASCII |
| .xtr | Tuner result created by XPRStune. | XML |
| .json | Remote Solving Configuration file | JSON |
In the following sections we describe the formats for a number of these.
Note that CSV stands for comma-separated-values text file format.
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