Key for interpreting lengths in a plot
Key for interpreting lengths in a plot
lengthKey(x,y,tickpos,scale)
x,y |
The position of the left end of the key in user units. |
tickpos |
The labels that will appear above the key. |
scale |
A value that will scale the length of the key. |
lengthKey displays a line with tick marks and the values in tickpos above those tickmarks. It is useful when line segments on a plot represent numeric values. Note that if the plot does not have a 1:1 aspect ratio, a length key is usually misleading.
nil
Jim Lemon
# manufacture a matrix of orientations in radians o<-matrix(rep(pi*seq(0.1,0.8,by=0.1),7),ncol=8,byrow=TRUE) m<-matrix(rnorm(56)+4,ncol=8,byrow=TRUE) # get an empty plot of approximately 1:1 aspect ratio plot(0,xlim=c(0.7,8.3),ylim=c(0.7,7.3),type="n") vectorField(o,m,vecspec="rad") # the scaling usually has to be worked out by trial and error lengthKey(0.3,-0.5,c(0,5,10),0.24)
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