Looking at ?points I see information that appears directed at this
question:
Value pch="." (equivalently pch = 46) is handled specially. It is a
rectangle of side 0.01 inch (scaled by cex). In addition, if cex = 1
(the default), each side is at least one pixel (1/72 inch on the pdf,
postscript and xfig devices).
The points appear with plot(1:10, pch = ".", cex=1)
I can still see the points in a pdf output when pch="." and cex=0.5,
but when directed to a jpg file, the points are no longer visible on
my Mac 10.5.6 running R 2.8.1 Patched (2009-01-07 r47515)
--
David Winsemius
On Jan 21, 2009, at 8:48 PM, davidfarr wrote:
I am using the following script to make .jpg files.
jpeg('plotx.jpg')
ddat <-read.table("file",header=T)
attach(ddat)
tdat<-read.table("file1")
plot
(xx1
,yy1,type='p',pch=1,col="blue",cex=0.2,xlim=c(0,3.5),ylim=c(-75,75))
points(tdat,col="green",pch=1,cex=0.2)
dev.off()
The problem is that I want the points to be very small; however, if
I make
cex any smaller than 0.2 the plot in the .jpg file is blank. If I
run the
commands from the console (on a Mac) - with the exception of jpeg()
and
dev.off() then it works even if cex < 0.2. I've tried making .ps
files and
converting to .jpg but then I run into different problems with the
animation
software (imageJ).
Thanks for any suggestions
--
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