Re: [R] to extract particular date/data
If I have this daily rainfall data, how do call a particular day?
Year,Month,Day,Amount
1900,12,22,1.3
1900,12,23,0
1900,12,24,0
1900,12,25,0
1900,12,26,0
1900,12,27,0
1900,12,28,0
1900,12,29,4.8
1900,12,30,0.3
1900,12,31,0.5
1901,1,1,0
1901,1,2,3
1901,1,3,0
1901,1,4,0.5
1901,1,5,0
1901,1,6,0
...
I used to use julian.date in S-Plus.
I read your data in as the following data frame:
rainfall
Year Month Day Amount
1 190012 221.3
2 190012 230.0
3 190012 240.0
4 190012 250.0
5 190012 260.0
6 190012 270.0
7 190012 280.0
8 190012 294.8
9 190012 300.3
10 190012 310.5
11 1901 1 10.0
12 1901 1 23.0
13 1901 1 30.0
14 1901 1 40.5
15 1901 1 50.0
16 1901 1 60.0
You can access only the days with rainfall$Day, but you might also like to
convert all the dates to POSIX format. This code will do the trick:
posixdates - with(rainfall, ISOdate(Year, Month, Day))
posixdates is a vector of class POSIXct, which means it is the number of
seconds since the start of 1970, with some methods to make it print nicely
and behave itself in time series plots.
See also ?julian, and the chron package.
Regards,
Richie.
Mathematical Sciences Unit
HSL
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Re: [R] to extract particular date/data
Have a look at the zoo package which has three vignettes and R News 4/1. On Fri, May 2, 2008 at 12:27 AM, Roslina Zakaria [EMAIL PROTECTED] wrote: Hi R-expert, If I have this daily rainfall data, how do call a particular day? Year,Month,Day,Amount 1900,12,22,1.3 1900,12,23,0 1900,12,24,0 1900,12,25,0 1900,12,26,0 1900,12,27,0 1900,12,28,0 1900,12,29,4.8 1900,12,30,0.3 1900,12,31,0.5 1901,1,1,0 1901,1,2,3 1901,1,3,0 1901,1,4,0.5 1901,1,5,0 1901,1,6,0 ... I used to use julian.date in S-Plus. Thank you so much for your kind attention and help. [[elided Yahoo spam]] __ R-help@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. __ R-help@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.
[R] to extract particular date/data
Hi R-expert, If I have this daily rainfall data, how do call a particular day? Year,Month,Day,Amount 1900,12,22,1.3 1900,12,23,0 1900,12,24,0 1900,12,25,0 1900,12,26,0 1900,12,27,0 1900,12,28,0 1900,12,29,4.8 1900,12,30,0.3 1900,12,31,0.5 1901,1,1,0 1901,1,2,3 1901,1,3,0 1901,1,4,0.5 1901,1,5,0 1901,1,6,0 ... I used to use julian.date in S-Plus. Thank you so much for your kind attention and help. [[elided Yahoo spam]] __ R-help@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.
