On Wed, 2007-12-19 at 14:59 +0800, gallon li wrote:
> I have the following list of observations of calendar time:
>
> [1] 03-Nov-1997 09-Oct-1991 27-Aug-1992 01-Jul-1994 19-Jan-1990 12-Nov-1993
> [7] 08-Oct-1993 10-Nov-1982 08-Dec-1986 23-Dec-1987 02-Aug-1995 20-Oct-1998
> [13] 29-Apr-1991 16-Mar-1994 20-May-1991 28-Dec-1987 14-Jul-1999 27-Nov-1998
> [19] 09-Sep-1999 26-Aug-1999 20-Jun-1997 05-May-1995 26-Mar-1998 15-Aug-1994
> [25] 24-Jun-1996 02-Oct-1996 12-Aug-1985 24-Jun-1992 09-Jan-1991 04-Mar-1988
> 3230 Levels: 01-Apr-1987 01-Apr-1990 01-Apr-1991 01-Apr-1996 ... 31-Oct-1998
>
> I want to make a plot where x-axis is the calendar time and y-axix is the
> cumulative sum of observations observed on or before that dates.
Is this what you want?
## some example data
dat <- cumsum(rnorm(100))
start.end <- as.Date(c("01/01/2007", "31/12/2007"), format = "%d/%m/%Y")
dates <- seq(start.end[1], start.end[2], length = 100)
## plot the data
plot(dat ~ dates, type = "l")
HTH
G
--
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Dr. Gavin Simpson [t] +44 (0)20 7679 0522
ECRC, UCL Geography, [f] +44 (0)20 7679 0565
Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk
Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/
UK. WC1E 6BT. [w] http://www.freshwaters.org.uk
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