[R] increase number of ticks on x axis of dates

[Don MacQueen]

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
>             
>
>______________________________________________
>R-help at r-project.org mailing list
>https:// stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide http:// www. R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.


-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062