[R] transparency in segments()

[Rui Barradas]

Hello,

You can use ?rgb to set the transparency level. As an example, with 
alpha = 0.5

clr <- c(rgb(1, 0, 0, 0.5), rgb(0, 0, 1, 0.5))
plot(0:1, 0:1, col = clr[1], lwd = 10, type = "l")
lines(0:1, 1:0, col = clr[2], lwd = 10)


Hope this helps,

Rui Barradas
Em 10-01-2013 21:29, Robert Pazur escreveu:
> Dear all,
> i would like to plot each value from my datasets as segment with defined
> transparency
> However, I didnt find out how to set the transparency.
> definition by "col=" in par() or segments() doesnt seem to work
> any suggestions?
>
> Thanks in advance.
> Kind regards,
> Robert Pazur
>
> example code:
> xx2 <-read.table("http://www.scandinavia.sk/data/R/0_05.csv", sep=";",
> header=T)
> plot(xx2$MEAN_PERI,ylim=c(50,350),xlim=c(1,30000),log= "x",
> yaxt='n',ylab="",xlab="mean", type = "n")
> segments(xx2$MEAN_PERI, 60,xx2$MEAN_PERI, 100, tcl=-.2)
> xx3 <-read.table("http://www.scandinavia.sk/data/R/0_10.csv", sep=";",
> header=T)
> segments(xx3$MEAN_PERI, 120,xx3$MEAN_PERI, 160, tcl=-.2)
> xx4 <-read.table("http://www.scandinavia.sk/data/R/0_15.csv", sep=";",
> header=T)
> segments(xx4$MEAN_PERI, 180,xx4$MEAN_PERI, 220, tcl=-.2)
> xx5 <-read.table("http://www.scandinavia.sk/data/R/0_20.csv", sep=";",
> header=T)
> segments(xx5$MEAN_PERI, 240,xx5$MEAN_PERI, 280, tcl=-.2)
> xx6 <-read.table("http://www.scandinavia.sk/data/R/0_25.csv", sep=";",
> header=T)
> segments(xx6$MEAN_PERI, 300,xx6$MEAN_PERI, 340, tcl=-.2)
>
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