I am confused by the behavior of the lines function when the lty argument is a
vector. ?lines indicates that lty is a valid parameter, but says nothing else
about it. ?plot.xy (which I think is what gets called) refers back to ?lines.
?plot.default says to see ?par. In ?par, about lty it says "Some functions
such as lines accept a vector of values which are recycled. Other uses will
take just the first value if a vector of length greater than one is supplied."
However, I cannot get lines to use more than one type of line. Some example
code:
pt <- runif(10)
plot(pt)
lines(pt, type="c", lty=1:10)
I expected each subsequent line segment to be in a different style. Only the
first seems to be used. The same is true for plot:
plot(pt, type="b", lty=1:10)
uses only one style of line segment (although no documentation says explicitly
that the others would be used). It doesn't matter the order or manner of
specification, only the first is used.
plot(pt)
lines(pt, type="c", lty=c("dashed","solid"))
plot(pt)
lines(pt, type="c", lty=c("FF", "11"))
I have used a vector of lty before (in legend) and it cycled through all the
values. Am I misunderstanding what a vector lty to lines means, or is this a
bug?
I'm running on Windows XP Pro, if that might matter.
> sessionInfo()
R version 2.8.0 (2008-10-20)
i386-pc-mingw32
locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
--
Brian Diggs, Ph.D.
Senior Research Associate, Department of Surgery, Oregon Health & Science
University
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