# [R] How to generate 'minor' ticks in lattice (qqmath)

From: Helmut Schütz <helmut.schuetz_at_bebac.at>
Date: Tue 23 Jan 2007 - 15:36:04 GMT

R version 2.4.1 (2006-12-18)

An example:

library(lattice)
numy=100
y=runif(numy,min=0,max=1)
sig=0.05
numsig=length(which(y<sig))

tck.no=11 # number of ticks
tcks=1:tck.no
labl=as.character(0.1*tcks-0.1) # label for all ticks labl[seq(2,tck.no-1,2)]="" # delete every second label nums=seq(0,(tck.no-1)/10,(tck.no-1)/100)

qqmath(y,distribution=qunif,
prepanel=NULL,
panel=function(x)
{
panel.abline(c(0,1),lty=2)

panel.polygon(c(0,0,numsig/numy,numsig/numy,0),c(0,sig,sig,0,0),lwd=0.75)

panel.qqmath(x,distribution=qunif,col=1)     },
scales=list(

```      tck=c(1,0),
x=list(at=nums,labels=labl),
cex=0.8),
```

xlab=paste("uniform [0,1] quantiles"),     ylab="runif [0,1]",
min=0,max=1)

Two questions:
1. How do I define the same labels for the second (left) axis (I suspect a second dimension in scales(list(x=list...) would do the job, but I haven't been able finding out, how...
2. Is there any alternative to obtain minor ticks in lattice like "minor.ticks" in Hmisc?

Best regards,
Helmut

```--
Helmut Schütz
BEBAC
Consultancy Services for Bioequivalence and Bioavailability Studies
Neubaugasse 36/11
1070 Vienna/Austria
tel/fax +43 1 2311746
Web http://BEBAC.at
BE/BA Forum http://forum.bebac.at
http://www.goldmark.org/netrants/no-word/attach.html

______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help