[R] Problem using plot and converted dates

[s.e.roberts at qmul.ac.uk]

Dear R-help,
I am having problems with plotting converted dates in chronological as Mar-03,
May-03...Jul-04.
My script is:

sam4<-c("03/03/01","03/05/01","03/07/01","03/09/01","03/11/01","04/01/01","04/03/01","04/05/01","04/07/01")
sam5<-strptime(sam4,format="%y/%m/%d")
f<-data.frame(sam5,mkf)
plot(f,type="l")
# This works ok, but none of the labels appear on the x-axis, so I thought I
would convert them using
# as.POSIXct:

sam6<-format(as.POSIXct(sam5), "%b-%y")
mon<-factor(as.character(sam6),levels=sam6)
f2<-data.frame(mon,mkf)
plot(f2,type="l")

The problem is that plot(f2,type="l") no longer produces a line plot...

Any help with this would be gratefully appreciated.

Best wishes,
Sion


--
Siôn Roberts

Department of Geography,
Queen Mary, University of London,
London,
E1 4NS.

Tel: +44 20 7882 5400
http://www.geog.qmul.ac.uk/postgraduate/student/roberts.html