GAP (polymaking) - Chapter 3: Global Variables

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3 Global Variables
3.1 Getting information about polymake output
3.1-1 InfoPolymaking
3.1-2 POLYMAKE_LAST_FAIL_REASON
3.2 Variables for system interaction
3.2-1 POLYMAKE_COMMAND
3.2-2 POLYMAKE_DATA_DIR

### 3 Global Variables

#### 3.1 Getting information about polymake output

##### 3.1-1 InfoPolymaking

`> InfoPolymaking` | ( info class )

If set to at least 2, the output of polymake is shown. At level 1, warnings are shown. This is the default. And at level 0, the polymake package remains silent.

##### 3.1-2 POLYMAKE_LAST_FAIL_REASON

`> POLYMAKE_LAST_FAIL_REASON` | ( global variable )

Contains a string that explains the last occurence of `fail` as a return value of `Polymake` (2.5-1).

#### 3.2 Variables for system interaction

The variables for interaction with the system are contained in the file `environment.gi`. Each of these variables has a function to set it, see 1.2. If `POLYMAKE_COMMAND` or `POLYMAKE_DATA_DIR` are set at startup, they are not overwritten. So if you don't want (or don't have the rights) to modify `environment.gi`, you can set the variables in your `.gaprc` file.

##### 3.2-1 POLYMAKE_COMMAND

`> POLYMAKE_COMMAND` | ( global variable )

This variable should contain the name of the polymake program in the form as returned by `Filename` So a probable value is `Filename(Directory("/usr/local/bin"),"polymake")`.

##### 3.2-2 POLYMAKE_DATA_DIR

`> POLYMAKE_DATA_DIR` | ( global variable )

In this directory the files for polymake will be created. By default, this generates a temporary directory using `DirectoryTemporary`

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