[R] Graph Script/X-axis label Problem

[jimdare]

Hi,  I created the script below to plot multiple graphs.  It seems to work
pretty well (see BYX7) except when the max value for catch or TACC is very
small.  In this case the x-axis labels are removed from the x-axis (see
BYX10).  I can't figure out why given that y co-ordinate for the text
function is par("usr")[1] - 0.  Shouldn't this mean that it is flush to the
x-axis?  Can anyone see what is going wrong?  

SCRIPT:

fish<-read.csv(file="C:/Documents and Settings/darej/My
Documents/James/R/fishmany.csv",sep=",",head=T)

x.sp <- split(fish, list(fish$Species, fish$Stock)) 

for (i in x.sp){

par(mar = c(7, 6, 4, 2) + 0.1)
yaxmax=(max(i$TACC, i$Catch))*1.2
mp <- barplot(i$TACC, xaxt="n",
main=paste(i$Stock[1]),space=0,xlab="",ylab="",ylim=c(0,max(i$TACC,
i$Catch))*1.2)

axis(1, labels = FALSE)
labels <- paste(i$Year, sep = " ")
text(mp, par("usr")[1] - 0, srt = 45, cex=0.75,adj = 1,
     labels = labels, xpd = TRUE)

lines(mp, i$Catch, type='o', pch=18,lwd=2)
legend("topright",legend=
c("TACC","Catch"),bty="n",col=c("black","black"),lty=c(0,1),lwd=c(0,2), 
pch=c(22,18),pt.bg=c("grey",NA),pt.cex=2)
xmax=length(i$Year)
text(xmax*0.6, par("usr")[1] - (0.1*yaxmax), srt = 0, adj = 1,
     labels = "Fishing Year", xpd = TRUE,cex=1.2)

text(xmax*-0.15, par("usr")[1] + (0.6*yaxmax), srt = 90, adj = 1,
     labels = "Tonnes", xpd = TRUE,cex=1.2)

savePlot(filename=paste(i$Stock[1]),type="wmf")
}  

http://www.nabble.com/file/p21364546/BYX7.gif 
http://www.nabble.com/file/p21364546/BYX10.gif 
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