After doing your plot command, type
par()$usr
This will give you the x and y axis ranges. Make sure that the "at"
values you give are within the x-axis range.
-Don
At 2:59 PM -0400 6/8/09, Graves, Gregory wrote:
My x axis is a series of daily dates (e.g., 01/01/2000, 01/02/2000,
etc.) from 2000 to end of 2008. The default only gives me 4 ticks. I
want more. Why doesn't this work?
sdate<-as.POSIXct(strptime(date,format="%m/%d/%Y"))
plot(ppt~sdate,type="l",ylim=c(0,47),col=1,lwd=1,pch=16,ylab="Salinity,
psu",xlab="Year",las=1,main="Duck Key Salinity",xaxt="n")
year.text=c("2001","2002","2003","2004", "2005", "2006", "2007","2008",
"2009")
axis(1, at=c(1:9),labels=year.text)
Gregory A. Graves
Lead Scientist
REstoration COoordination and VERification (RECOVER)
Watershed Division
South Florida Water Management District
Phones: DESK: 561 / 682 - 2429
CELL: 561 / 719 - 8157
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PLEASE do read the posting guide http:// www. R-project.org/posting-guide.html
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--
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
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and provide commented, minimal, self-contained, reproducible code.
