[R] Subset, period of days like one after another in a group

[arun]

Hi,
#if 'dat` is the dataset
May be this helps.
lst1 <- setNames(split(dat, cumsum(c(TRUE,diff(dat$date)!=1))),LETTERS[1:4])
A.K.



On Tuesday, May 20, 2014 12:17 PM, Christoph Schlächter <christoph.schlaechter at gmail.com> wrote:
Dear all,

I have a subset of a data frame with 3 columns and a few rows. The columns
are “date” [%Y %m %d], “mon” [%b]  and “wea” for type of weather with “dw”
dry weather “rw” rainy weather.

Here it is as a list:

structure(list(date = structure(c(15765, 15766, 15767, 15768,
15769, 15770, 15771, 15772, 15773, 15780, 15781, 15782, 15788,
15789, 15790, 15791, 15792, 15795), class = "Date"), mon = c("Mrz",
"Mrz", "Mrz", "Mrz", "Mrz", "Mrz", "Mrz", "Mrz", "Mrz", "Mrz",
"Mrz", "Mrz", "Mrz", "Mrz", "Mrz", "Mrz", "Mrz", "Mrz"), wea =
structure(c(1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
1L), .Label = c("dw", "rw"), class = "factor")), .Names = c("date",
"mon", "wea"), row.names = c(1156L, 1157L, 1158L, 1159L, 1160L,
1161L, 1162L, 1163L, 1164L, 1171L, 1172L, 1173L, 1179L, 1180L,
1181L, 1182L, 1183L, 1186L), class = "data.frame")

I want to get a period of days when it is dry weather and the difference
between days should be not more than one day.

For this example I need something to get:

Maybe as Group:

A:

2013-03-01 Mrz  dw
2013-03-02 Mrz  dw
2013-03-03 Mrz  dw
2013-03-04 Mrz  dw
2013-03-05 Mrz  dw
2013-03-06 Mrz  dw
2013-03-07 Mrz  dw
2013-03-08 Mrz  dw
2013-03-09 Mrz  dw

B

2013-03-16 Mrz  dw
2013-03-17 Mrz  dw
2013-03-18 Mrz  dw

C

2013-03-24 Mrz  dw
2013-03-25 Mrz  dw
2013-03-26 Mrz  dw
2013-03-27 Mrz  dw
2013-03-28 Mrz  dw

D

2013-03-31 Mrz  dw

How can I achive this. I really have only very few ideas like cast() or
melt() or both but i have trouble with the date format.

Thanks in advance. <r-help at r-project.org> <r-help at r-project.org>

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