Well, if it is transparent then you will not see it: I presume you mean
translucent (aka semi-transparent). With 50% opacity you could use
red <- rgb(0x9E, 0x47, 0x70, 127, max=255)
polygon(xvalue1,yvalue1,col=red,border=red)
See ?rgb.
You can also specify a translucent colour as e.g. "#9E47707F", but that
seems less intuitive.
On Thu, 4 Dec 2008, Dr. Alireza Zolfaghari wrote:
Hi list,
Does any one know how I can make the red colour transparant?
#########################
par()
#Set up blank plot to remove plot border type lty="n"
xvalue1<- c(1,2,2,1)
xvalue2<- c(1,3,3,1)
yvalue1<- c(0,0,22,22)
yvalue2<- c(0,0,44,44)
plot(c(min(xvalue2),max(xvalue2)),c(min(yvalue2),max(yvalue2)),type="n",xaxt="n",yaxt="n",xlab="",ylab="Loss
in ?m",yaxs="i",xaxs="r")
polygon(xvalue2,yvalue2,col="#A8B50A",border="#A8B50A")
polygon(xvalue1,yvalue1,col="#9E4770",border="#9E4770")
#########################
regards,
Alireza
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--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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