Tim Smith wrote:
Hi,
I was trying to get error bars in my matplot. I looked at an earlier thread,
and the sample code that I made is:
#------------------
library(plotrix)
mat1 <- matrix(sample(1:30,10),nrow=5,ncol=2)
ses <- matrix(sample(1:3,10,replace=T),nrow=5,ncol=2)
vect <- seq(20,100,20)
rownames(mat1) <- rownames(ses) <- vect
colnames(mat1) <- colnames(ses) <- letters[1:2]
matplot(mat1,pch=c('x','o'),type = "b",lwd = 2,lty = c(1,2),
col = c("green","black"),cex.main = 1.8,cex=2,cex.lab=1.5,
main = "Graph 1",xlab = "Numbers 1",ylab = "Numbers 2",cex.axis =
1.6,axes=F)
plotCI(rep(vect,2),mat1,ses2,pch=NA,add=T,
col=rep(c("green","black"),each=nrow(mat1)))
axis(1,1:5,labels = vect,cex.axis=1.5)
axis(2,cex.axis=1.5)
#------------------
I don't get the error bars though. If I set 'add = F' in plotCI function, then
I can see the error bars, but they just can't be added to the matplot. What am
I doing wrong? Is there any other way to get the error bars?
Hi Tim,
Try the dispersion function in plotrix to add error bars. You will
probably have to add ylim=c(0,29) to your matplot command.
dispersion(rep(1:5,2),mat1,ses)
Jim
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