plOptUsage: Print usage and syntax message.

`plOptUsage`: Print usage and syntax message.
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#### `plOptUsage`: Print usage and syntax message.

`plOptUsage (` | `)`;

Prints the usage and syntax message. The message can also be display using the -h command line option. There is a default message describing the default plplot options. The usage message is also modified by `plSetUsage` and `plMergeOpts`.

`program_string` (`const char *`, input)

  String to appear as the name of program.

`usage_string` (`const char *`, input)

  String to appear as the usage text.

This function is currently available in C, C++, Java, Ocaml, Octave and Python.

This function is not used in any examples.

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`plMinMax2dGrid`: Find the minimum and maximum of a 2d grid allocated using `plAlloc2dGrid`. | Home | `plMergeOpts`: Reset internal option table info structure.