plsvect: Set arrow style for vector plots

The PLplot Plotting Library: Programmer's Reference Manual
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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 *`,input) Pointers to a pair of arrays 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`. `npts` (`PLINT`,input) Number of points in the arrays ``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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