Ask yourself:
a) whether anyone could possibly see what you are seeing with the data
you have offered, and ...
(Just a guess that this is the problem)
b) what POSIXct dates are represented by 1:9? Would they even be in
the range 2001-2009?
> ddd <- as.POSIXct(strptime(c("01/01/2000", "01/02/2000"),format="%m/
%d/%Y"))
> ddd
[1] "2000-01-01 EST" "2000-01-02 EST"
> ddd+1
[1] "2000-01-01 00:00:01 EST" "2000-01-02 00:00:01 EST"
On Jun 8, 2009, at 2:59 PM, 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)
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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