where to start each vector along the reference line
yref
vertical position to place the reference line
use.arrows
whether to put arrow heads on the ends of the vectors
col.refline
the color of the reference line
fp.type
whether to use "standard" coordinates (begin at the
right and move counterclockwise) or "meteorological" coordinates
(begin at the top and move clockwise) when interpreting the values
of theta
main
the title of the plot
xlab
the label for the reference line
ylab
the label for the vertical axis
xlabels
optional labels for the reference line
...
additional arguments passed to arrows or segments
Details
This function places vectors of length r and angle theta
along a reference line that may represent time or position or some other
value. The user is responsible for spacing the vectors so that they do
not overlap if this is desired.
Feather plots are typically wider than high. The user will probably want
to specify a graphics device that doesn't leave lots of blank space above
and below the plot.