plotting the coordinates versus dates

Hello!
I have a dataset with the dates and positions -  Lat and Long columns
How do I make a scatter  plot?
Do I have to cbind to combine the Lat and Long columns?
Any suggestions will be much appreciated!

Hi Julia,
I depends greatly on what you want to plot. Let's assume that you want 
to plot the dates at the geographical positions (named "lat" and "lon"), 
and that the dates are character strings.

plot(lon,lat,main="Dates of the observations",
  xlab="Longitude",ylab="Latitude",type="n")
text(lon,lat,dates)

This assumes that you haven't got too many dates, and a fair bit of 
latitude (and longitude). It should give you an idea of one type of plot.

Jim

Hello!
I have a dataset with the dates and positions -  Lat and Long columns
How do I make a scatter  plot?
Do I have to cbind to combine the Lat and Long columns?
Any suggestions will be much appreciated!
Thank you
Julia


	[[alternative HTML version deleted]]

______________________________________________
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.
  

If you cast your data into the spatial classes for R provided by the 
sp-pacakge, you can easily make nice plots. After installing sp from CRAN:

library(sp)
data(meuse)
meuse
summary(meuse)
coordinates(meuse) = ~x+y
?coordinates

spplot(meuse, "zinc")

The r-sig-geo mailing list is more suitable for this kind of question.

cheers,
Paul

Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone:  +3130 274 3113 Mon-Tue
Phone:  +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul