Figure 4.37: The MPL Language Options Dialog Box
You can change the various preferences for MPL by choosing MPL Language from the Options menu. This will display the MPL Languages Options dialog box shown below.
Figure 4.37: The MPL Language Options Dialog Box
| Option Name | MPL Name | Solver Param | ParamNr | Type | Default | Min | Max |
|---|---|---|---|---|---|---|---|
| Case Sensitive | CaseSensitive | Flag | 1 | 0 | 1 | ||
| Plain variables must be defined | PlainVarDefined | Flag | 1 | 0 | 1 | ||
| Message window | DataCoeffList | Flag | 1 | 0 | 1 | ||
| Log file | LogToFile | Flag | 1 | 0 | 1 | ||
| ModelType | ModelType | list | 1 | 0 | 3 | ||
| Use Extended Parser | ParserType | flag | 0 | 0 | 1 | ||
| Input Directory | InputDir | String | 0 | 0 | 0 | ||
| Output Directory | OutputDir | String | 0 | 0 | 0 | ||
| Check sparse data for duplicate entries | CheckDuplicateData | Flag | 1 | 0 | 1 | ||
| Check sparse data is outside range | CheckOutsideRange | Flag | 1 | 0 | 1 | ||
| Use quicksort for sparse data | UseQuickSort | Flag | 1 | 0 | 1 | ||
| Name Generation | NameGenType | Flag | 0 | 0 | 2 | ||
| Max variable length | MaxVarLen | Integer | 8 | 1 | 40 | ||
| Max subscript Length | MaxSubLen | Integer | 3 | 1 | 40 |
Directs whether the MPL language is case sensitive or not. The default is case sensitive On.
Specifies whether plain variables must be defined in the Decision Variable section of the model or can be introduced as they appear in the model. For larger models, requiring plain variables to be defined, can increase the maintainability of the model.
Specifies whether log information from the MPL language parser are send to the Message Window. This is the same option as the Performance statistics option in the PL Environment Options dialog box.
Specifies whether log information from the MPL language parser are to send to file.
Specifies the defualt model type the MPL language parser should accept.
| Linear Models (1) | Specifies that the MPL language parser should only accept models that are either linear or mixed integer. |
| Quadratic Models (2) | Specifies that the MPL language parser should accept models that are quadratic in addition to the standard linear or mixed integer models. |
| Nonlinear Models (3) | Specifies that the MPL language parser should accept models that are nonlinear, for example have variables multiplied together or uses one of the arithmetic functions like LOG or EXP on variables. |
Specifies that the extended MPL language parser should be used to parse the MPL model file. The extended parser allows more complicated expressions to be parsed like nested summations/mulitplications, often useful in nonlinear modeling.
Selects the folder where MPL will search for input data files. The default is the current folder.
Selects the folder where MPL will save output data files. The default is the current folder.
Specifies whether sparse data files are checked for duplicate index entries. In some cases the user may want to read in a data file without receiving errors even if it has duplicate entries. When there are duplicate entries, the last entry in the file will be used by MPL.
Specifies whether sparse data files are checked whereby the index entries are outside the defined index ranges.
Specifies whether sparse data is sorted with quicksort after it is read in. It is normally faster to use quicksort but if there is an invalid entry, such as duplicates, in the data file MPL will not be able to pinpoint the problem line accurately.
Specifies the format for which MPL will generate the names for the vector variables and constraints.
| Indexed names (0) | Directs MPL to generate names for vector variables and constraints using the indexes they were defined with. |
| Numeric names (1) | Directs MPL to generate variable names as numeric with the prefix 'C' and constraint names with the prefix 'R'. |
| Prefixed numeric names (2) | Directs MPL to generate names for vector variables and constraints as numeric with the prefix based on the vector name. |
Most LP solvers have a restriction on the length of variable names. Since MPL, in most cases, sends the matrix directly through memory to the solver, the variable names are normally not needed. If they are needed, the value set here helps you ensure that the variable names generated are within limits. The default value is 8.
This value decides how many characters of indexes are retained in the generated variable name. This allows you to use long index names in the model, but keep variable names concise in the generated input file. The default value is 3.