[R] Plotting multiple continuous lines with symbols

From: Tariq Perwez <tariq.perwez_at_gmail.com>
Date: Tue, 10 Jun 2008 12:13:59 -0400

I am trying to plot multiple lines on one plot such that all lines are of the same color (black) and continuous. I need to distinguish these multiple plots from each other by using different symbols (I am using pch=). However, all my lines are broken on both sides of the symbols. This unfortunate (and unsightly) behavior seems to be the default. In my search of the help archives for R over several days, I have not been able to solve this problem. I would appreciate any help and suggestions. My code for the plot is below (minus the data):

exa1.1 <- read.table("multcol.txt", header=T, sep=' ')# Total of 4 columns; first one to be on x-axis

plot(exa1.1$Year, exa1.1$EM, ylim=range(exa1.1[,-1]), type = 'b' ,pch=16,
main = ""), las=1, cex.main=1.75,lab =c(12,8,10), ylab="", xlab="", )
lines(exa1.1$Year,exa1.1$IM,type='b', pch=1)
lines(exa1.1$Year,exa1.1$BM,type='b', pch=17)
mtext(side = 2, text = "Klett units", line = 3.5, cex=1.2) mtext(side = 1, text = expression(Time~at~37*degree*C~(minutes)), line = 2.75,cex=1.2)



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