plpat: Set area line fill pattern

`plpat`: Set area line fill pattern
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#### `plpat`: Set area line fill pattern

`plpat (` | nlin ,
| inc ,
| del `)`;

Sets the area line fill pattern to be used, e.g., for calls to `plfill`. The pattern consists of 1 or 2 sets of parallel lines with specified inclinations and spacings. The arguments to this routine are the number of sets to use (1 or 2) followed by two vectors (with 1 or 2 elements) specifying the inclinations in tenths of a degree and the spacing in micrometers. (See also `plpsty`)

`nlin` (``PLINT``, input)

  Number of sets of lines making up the pattern, either 1 or 2.

`inc` (``PLINT_VECTOR``, input)

  A vector containing ``nlin`` values of the inclination in tenths of a degree. (Should be between -900 and 900).

`del` (``PLINT_VECTOR``, input)

  A vector containing ``nlin`` values of the spacing in micrometers between the lines making up the pattern.

Redacted form:

- General: `plpat(inc, del)`

- Perl/PDL: `plpat(nlin, inc, del)`

This function is used in example 15.

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