Display vectors along a horizontal reference line

Description

Displays vectors along a line usually representing time or position.

Usage

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 feather.plot(r,theta,xpos,yref=0,use.arrows=TRUE,
 col.refline="lightgray",fp.type="s",main="",xlab="",ylab="",
 xlabels=NULL,...)

Arguments

r

radii of vectors

theta

direction of vectors in radians

xpos

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.

Value

nil

Author(s)

Jim Lemon, Eduardo Klein

See Also

spread.labels

Examples

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 dev.new(width=8,height=3)
 r<-0.6+rnorm(24)/5
 theta<-c(seq(15*pi/16,pi/16,length.out=12),
  seq(17*pi/16,31*pi/16,length.out=12))
 feather.plot(r,theta,xlabels=1:24,
  main="Standard Coordinates",xlab="Time",ylab="Value")
 # rearrange theta for meteorological coordinates
 feather.plot(r,c(theta[19:24],rev(theta[7:18]),theta[1:6]),xlabels=1:24,fp.type="m",
  main="Meteorological Coordinates",xlab="Time",ylab="Value")
 dev.off()

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