plsvect: Set arrow style for vector plots

`plsvect`: Set arrow style for vector plots
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#### `plsvect`: Set arrow style for vector plots

`plsvect (` | arrowx ,
| arrowy ,
| npts ,
| fill `)`;

Set the style for the arrow used by `plvect` to plot vectors.

`arrowx, arrowy` (``PLFLT_VECTOR``, input)

  A pair of vectors containing the x and y points which make up the arrow. The arrow is plotted by joining these points to form a polygon. The scaling assumes that the x and y points in the arrow lie in the range `-0.5 <= x,y <= 0.5`. If both ``arrowx`` and ``arrowy`` are NULL then the arrow style will be reset to its default.

`npts` (``PLINT``, input)

  Number of points in the vectors ``arrowx`` and ``arrowy`` .

`fill` (``PLBOOL``, input)

  If ``fill`` is true then the arrow is closed, if ``fill`` is false then the arrow is open.

Redacted form: `plsvect(arrowx, arrowy, fill)`

This function is used in example 22.

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