Hi,
If you wish to connect each point to the next with a different
linetype, I think your best bet is to use segments()
x <- stats::runif(12); y <- stats::rnorm(12)
i <- order(x,y); x <- x[i]; y <- y[i]
plot(x, y)
s <- seq(length(x)-1)
segments(x[s], y[s], x[s+1], y[s+1], lty=1:10)
If, however, you wish to plot several groups of lines with different
linetypes, then matlines() should do the job. Both of these make
actual use of lty as a vector, while polygon(), abline(), plot(),
lines() will only use the first value (as far as i can see).
Hope this helps,
baptiste
On 20 Nov 2008, at 20:24, Brian Diggs wrote:
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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_____________________________
Baptiste Auguié
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
Phone: +44 1392 264187
http://newton.ex.ac.uk/research/emag
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
