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penguins

2012-Aug-05 20:30 UTC

[R] find date between two other dates

Hi,

I am trying to assign "Season" values to dates depending on when they
occur.

For example, the following dates would be assigned the following
"Season"
numbers based on the "season" intervals detailed below in the code:

ddate                               Season
29/12/1998 20:00:33       1
02/01/1999 05:20:44       2
02/01/1999 06:18:36       2
02/02/1999 07:06:59       3
02/03/1999 07:10:56       4
02/03/1999 07:57:18       4

My approach so far doesnt work because of the time stamps and is probably
very long winded. However, to prevent errors I would prefer to keep the date
formats as dd/mm/yyyy as oppose to a numeric format. Any help on the
following code would be gratefully recieved:
 
ddate <-  c("29/12/1998 20:00:33", "02/01/1999 05:20:44",
"02/01/1999
06:18:36", "02/02/1999 07:06:59", "02/03/1999
07:10:56", "02/03/1999
07:57:18")
ddate <- as.POSIXct(strptime(ddate, "%d/%m/%Y %H:%M:%S"),
"GMT")

is.between<-function(x, a, b) {
       (x > a) & (b > x)
}

ddate$s1 <- is.between(ddate, 01/12/1998 00:00:00, 31/12/1998 23:59:59)
ddate$s2 <- is.between(ddate, 01/01/1999 00:00:00, 31/01/1999 23:59:59)
ddate$s3 <- is.between(ddate, 01/02/1999 00:00:00, 28/02/1999 23:59:59)
ddate$s4 <- is.between(ddate, 01/03/1999 00:00:00, 31/03/1999 23:59:59)

Many thanks



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arun

2012-Aug-05 21:14 UTC

head link

[R] find date between two other dates

HI,

Try this:
ddate <-? c("29/12/1998 20:00:33", "02/01/1999 05:20:44",
"02/01/1999 06:18:36", "02/02/1999 07:06:59",
"02/03/1999 07:10:56", "02/03/1999 07:57:18")
ddate <- as.POSIXct(strptime(ddate, "%d/%m/%Y %H:%M:%S"),
"GMT")
ddate1<-data.frame(date=ddate)
date2<-c("01/12/1998 00:00:00", "31/12/1998 23:59:59",
"01/01/1999 00:00:00", "31/01/1999 23:59:59",
"01/02/1999 00:00:00", "28/02/1999 23:59:59",
"01/03/1999 00:00:00", "31/03/1999 23:59:59")
date3<-as.POSIXct(strptime(date2, "%d/%m/%Y %H:%M:%S"),
"GMT")
ddate1[ddate1$date<=date3[2]&
ddate1$date>=date3[1],"Season"]<-1
ddate1[ddate1$date<date3[4]&
ddate1$date>=date3[3],"Season"]<-2
ddate1[ddate1$date<date3[6]&
ddate1$date>=date3[5],"Season"]<-3
ddate1[ddate1$date<date3[8]&
ddate1$date>=date3[7],"Season"]<-4

?ddate1
???????????????? date Season
1 1998-12-29 20:00:33????? 1
2 1999-01-02 05:20:44????? 2
3 1999-01-02 06:18:36????? 2
4 1999-02-02 07:06:59????? 3
5 1999-03-02 07:10:56????? 4
6 1999-03-02 07:57:18????? 4


A.K.

----- Original Message -----
From: penguins <catrsw at bas.ac.uk>
To: r-help at r-project.org
Cc: 
Sent: Sunday, August 5, 2012 4:30 PM
Subject: [R] find date between two other dates

Hi,

I am trying to assign "Season" values to dates depending on when they
occur.

For example, the following dates would be assigned the following
"Season"
numbers based on the "season" intervals detailed below in the code:

ddate? ? ? ? ? ? ? ? ? ? ? ? ? ? ?  Season
29/12/1998 20:00:33? ? ?  1
02/01/1999 05:20:44? ? ?  2
02/01/1999 06:18:36? ? ?  2
02/02/1999 07:06:59? ? ?  3
02/03/1999 07:10:56? ? ?  4
02/03/1999 07:57:18? ? ?  4

My approach so far doesnt work because of the time stamps and is probably
very long winded. However, to prevent errors I would prefer to keep the date
formats as dd/mm/yyyy as oppose to a numeric format. Any help on the
following code would be gratefully recieved:

ddate <-? c("29/12/1998 20:00:33", "02/01/1999 05:20:44",
"02/01/1999
06:18:36", "02/02/1999 07:06:59", "02/03/1999
07:10:56", "02/03/1999
07:57:18")
ddate <- as.POSIXct(strptime(ddate, "%d/%m/%Y %H:%M:%S"),
"GMT")

is.between<-function(x, a, b) {
? ? ?  (x > a) & (b > x)
}

ddate$s1 <- is.between(ddate, 01/12/1998 00:00:00, 31/12/1998 23:59:59)
ddate$s2 <- is.between(ddate, 01/01/1999 00:00:00, 31/01/1999 23:59:59)
ddate$s3 <- is.between(ddate, 01/02/1999 00:00:00, 28/02/1999 23:59:59)
ddate$s4 <- is.between(ddate, 01/03/1999 00:00:00, 31/03/1999 23:59:59)

Many thanks



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______________________________________________
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.

Rui Barradas

2012-Aug-05 21:49 UTC

head link

[R] find date between two other dates

Hello,

You can use a function that returns the number you want, not a logical 
value.
But first, it's a bad idea to have a data.frame and a vector with the 
same name, so, in what follows, I've altered the df name.

ddate <-  c("29/12/1998 20:00:33", "02/01/1999 05:20:44",
"02/01/1999
06:18:36", "02/02/1999 07:06:59", "02/03/1999
07:10:56", "02/03/1999
07:57:18")
ddate <- as.POSIXct(strptime(ddate, "%d/%m/%Y %H:%M:%S"),
"GMT")
ddat <- data.frame(ddate=ddate)   # Here, different name.

season.month <- function(x){
     x <- as.integer(format(x, format="%m"))
     ifelse(x == 12L, 1L, x + 1L)
}

season.month(ddate)
ddat$season <- season.month(ddate)
str(ddat)
'data.frame':   6 obs. of  2 variables:
  $ ddate : POSIXct, format: "1998-12-29 20:00:33" "1999-01-02
05:20:44" ...
  $ season: int  1 2 2 3 4 4

ddat
                 ddate season
1 1998-12-29 20:00:33      1
2 1999-01-02 05:20:44      2
3 1999-01-02 06:18:36      2
4 1999-02-02 07:06:59      3
5 1999-03-02 07:10:56      4
6 1999-03-02 07:57:18      4

Hope this helps,

Rui Barradas

Em 05-08-2012 21:30, penguins escreveu:> Hi,
>
> I am trying to assign "Season" values to dates depending on when
they occur.
>
> For example, the following dates would be assigned the following
"Season"
> numbers based on the "season" intervals detailed below in the
code:
>
> ddate                               Season
> 29/12/1998 20:00:33       1
> 02/01/1999 05:20:44       2
> 02/01/1999 06:18:36       2
> 02/02/1999 07:06:59       3
> 02/03/1999 07:10:56       4
> 02/03/1999 07:57:18       4
>
> My approach so far doesnt work because of the time stamps and is probably
> very long winded. However, to prevent errors I would prefer to keep the
date
> formats as dd/mm/yyyy as oppose to a numeric format. Any help on the
> following code would be gratefully recieved:
>   
> ddate <-  c("29/12/1998 20:00:33", "02/01/1999
05:20:44", "02/01/1999
> 06:18:36", "02/02/1999 07:06:59", "02/03/1999
07:10:56", "02/03/1999
> 07:57:18")
> ddate <- as.POSIXct(strptime(ddate, "%d/%m/%Y %H:%M:%S"),
"GMT")
>
> is.between<-function(x, a, b) {
>         (x > a) & (b > x)
> }
>
> ddate$s1 <- is.between(ddate, 01/12/1998 00:00:00, 31/12/1998 23:59:59)
> ddate$s2 <- is.between(ddate, 01/01/1999 00:00:00, 31/01/1999 23:59:59)
> ddate$s3 <- is.between(ddate, 01/02/1999 00:00:00, 28/02/1999 23:59:59)
> ddate$s4 <- is.between(ddate, 01/03/1999 00:00:00, 31/03/1999 23:59:59)
>
> Many thanks
>
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/find-date-between-two-other-dates-tp4639231.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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.

arun

2012-Aug-05 22:13 UTC

head link

[R] find date between two other dates

Hi,

Your function is.between() can be also used.

is.between<-function(x,a,b){
?x<a& x>=b
?}
ddate <-? c("29/12/1998 20:00:33", "02/01/1999 05:20:44",
"02/01/1999 06:18:36", "02/02/1999 07:06:59",
"02/03/1999 07:10:56", "02/03/1999 07:57:18")
ddate <- as.POSIXct(strptime(ddate, "%d/%m/%Y %H:%M:%S"),
"GMT")
ddate1<-data.frame(date=ddate)
date2<-c("01/12/1998 00:00:00", "31/12/1998 23:59:59",
"01/01/1999 00:00:00", "31/01/1999 23:59:59",
"01/02/1999 00:00:00", "28/02/1999 23:59:59",
"01/03/1999 00:00:00", "31/03/1999 23:59:59")
date3<-as.POSIXct(strptime(date2, "%d/%m/%Y %H:%M:%S"),
"GMT")

ddate1[is.between(ddate1$date,date3[2],date3[1]),"Season"]<-1
?ddate1[is.between(ddate1$date,date3[4],date3[3]),"Season"]<-2
?ddate1[is.between(ddate1$date,date3[6],date3[5]),"Season"]<-3
?ddate1[is.between(ddate1$date,date3[8],date3[7]),"Season"]<-4
?ddate1
???????????????? date Season
1 1998-12-29 20:00:33????? 1
2 1999-01-02 05:20:44????? 2
3 1999-01-02 06:18:36????? 2
4 1999-02-02 07:06:59????? 3
5 1999-03-02 07:10:56????? 4
6 1999-03-02 07:57:18????? 4

A.K.


----- Original Message -----
From: penguins <catrsw at bas.ac.uk>
To: r-help at r-project.org
Cc: 
Sent: Sunday, August 5, 2012 4:30 PM
Subject: [R] find date between two other dates

Hi,

I am trying to assign "Season" values to dates depending on when they
occur.

For example, the following dates would be assigned the following
"Season"
numbers based on the "season" intervals detailed below in the code:

ddate? ? ? ? ? ? ? ? ? ? ? ? ? ? ?  Season
29/12/1998 20:00:33? ? ?  1
02/01/1999 05:20:44? ? ?  2
02/01/1999 06:18:36? ? ?  2
02/02/1999 07:06:59? ? ?  3
02/03/1999 07:10:56? ? ?  4
02/03/1999 07:57:18? ? ?  4

My approach so far doesnt work because of the time stamps and is probably
very long winded. However, to prevent errors I would prefer to keep the date
formats as dd/mm/yyyy as oppose to a numeric format. Any help on the
following code would be gratefully recieved:

ddate <-? c("29/12/1998 20:00:33", "02/01/1999 05:20:44",
"02/01/1999
06:18:36", "02/02/1999 07:06:59", "02/03/1999
07:10:56", "02/03/1999
07:57:18")
ddate <- as.POSIXct(strptime(ddate, "%d/%m/%Y %H:%M:%S"),
"GMT")

is.between<-function(x, a, b) {
? ? ?  (x > a) & (b > x)
}

ddate$s1 <- is.between(ddate, 01/12/1998 00:00:00, 31/12/1998 23:59:59)
ddate$s2 <- is.between(ddate, 01/01/1999 00:00:00, 31/01/1999 23:59:59)
ddate$s3 <- is.between(ddate, 01/02/1999 00:00:00, 28/02/1999 23:59:59)
ddate$s4 <- is.between(ddate, 01/03/1999 00:00:00, 31/03/1999 23:59:59)

Many thanks



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View this message in context:
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______________________________________________
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.

penguins

2012-Aug-06 08:13 UTC

head link

[R] find date between two other dates

Thanks arun and Rui; 3 fantastic suggestions. 

The Season interval is not always a month so arun's suggestion works better
for this dataset. I couldn't get the as.between function to work on
arun's
second suggestion, it only returned NAs. 

However, arun's first suggestion worked a treat!

Many thanks 



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