Hi All,
I recreated a new "sintetic" df1 based on df2 and I could merge:
> day_1 <- as.POSIXct("2005-11-14-00-00", format="%Y-%m-%d-%H-%M",
tz="Etc/GMT-1")
> day_2 <- as.POSIXct("2005-11-14-12-00", format="%Y-%m-%d-%H-%M",
tz="Etc/GMT-1")
> df2 <- data.frame(data_POSIX=seq(day_1, day_2, by="30 min"))
>
>
>
> df1 <- data.frame(
+ data_POSIX = df2[sample(1:nrow(df2), 15, replace =
FALSE),],
+ event = sample(c('start', 'end'), 15, replace = TRUE)
+ )
>
> df3 <- merge(df2, df1, by=c("data_POSIX"), all.x=TRUE)
> df3
data_POSIX event
1 2005-11-14 00:00:00 end
2 2005-11-14 00:30:00 start
3 2005-11-14 01:00:00 <NA>
4 2005-11-14 01:30:00 end
5 2005-11-14 02:00:00 end
6 2005-11-14 02:30:00 start
7 2005-11-14 03:00:00 end
8 2005-11-14 03:30:00 end
9 2005-11-14 04:00:00 start
10 2005-11-14 04:30:00 start
11 2005-11-14 05:00:00 <NA>
12 2005-11-14 05:30:00 <NA>
13 2005-11-14 06:00:00 <NA>
14 2005-11-14 06:30:00 start
15 2005-11-14 07:00:00 <NA>
16 2005-11-14 07:30:00 <NA>
17 2005-11-14 08:00:00 <NA>
18 2005-11-14 08:30:00 <NA>
19 2005-11-14 09:00:00 start
20 2005-11-14 09:30:00 start
21 2005-11-14 10:00:00 <NA>
22 2005-11-14 10:30:00 end
23 2005-11-14 11:00:00 <NA>
24 2005-11-14 11:30:00 end
25 2005-11-14 12:00:00 start
Regards,
Carlos Ortega
On Tue, Sep 29, 2020 at 10:13 AM Ivan Calandra <calan...@rgzm.de> wrote:
> Hi Stefano,
>
> For the merge() part, I'll leave it to more expert users (I rarely use
> merge(), and every time I need it, it's painful...).
>
> To know why <NA> instead of NA, check the results with str(df3); I guess
> it is not the mode you expected.
>
> For more details, you should provide the file, or better a reproducible
> example using dput().
>
> For the second part, your syntax was not correct (subsetting a column
> for elements based on a column that is not part of the subset!). And
> there is no column "pch" in your example. Try:
> df3[df3$event == "start", "event"] <- 24
>
> HTH,
> Ivan
>
> --
> Dr. Ivan Calandra
> TraCEr, laboratory for Traceology and Controlled Experiments
> MONREPOS Archaeological Research Centre and
> Museum for Human Behavioural Evolution
> Schloss Monrepos
> 56567 Neuwied, Germany
> +49 (0) 2631 9772-243
> https://www.researchgate.net/profile/Ivan_Calandra
>
> On 29/09/2020 9:59, Stefano Sofia wrote:
> > Dear R users,
> > I'm struggling with a simple "merge".
> >
> > I have an external file called df.txt like
> >
> > data_POSIX, event
> > 2005-11-14 02:30:00, "start"
> > 2005-11-14 11:30:00, "end"
> >
> > I load it with
> >
> > df1 <- read.table(file="df.txt", header=TRUE, sep=",", dec = ".",
> stringsAsFactors=FALSE)
> > df1$data_POSIX <- as.POSIXct(df1$data_POSIX, format="%Y-%m-%d %H:%M:%S",
> tz="Etc/GMT-1")
> >
> > Then I create a new data frame df2:
> >
> > day_1 <- as.POSIXct("2005-11-14-00-00", format="%Y-%m-%d-%H-%M",
> tz="Etc/GMT-1")
> > day_2 <- as.POSIXct("2005-11-14-12-00", format="%Y-%m-%d-%H-%M",
> tz="Etc/GMT-1")
> > df2 <- data.frame(data_POSIX=seq(day_1, day_2, by="30 min"))
> >
> > Finally
> >
> > df3 <- merge(df2, df1, by=c("data_POSIX"), all.x=TRUE)
> >
> > gives
> >
> > data_POSIX event
> > 1 2005-11-14 00:00:00 <NA>
> > 2 2005-11-14 00:30:00 <NA>
> > 3 2005-11-14 01:00:00 <NA>
> > 4 2005-11-14 01:30:00 <NA>
> > 5 2005-11-14 02:00:00 <NA>
> > 6 2005-11-14 02:30:00 start
> > 7 2005-11-14 03:00:00 <NA>
> > 8 2005-11-14 03:30:00 <NA>
> > 9 2005-11-14 04:00:00 <NA>
> > 10 2005-11-14 04:30:00 <NA>
> > 11 2005-11-14 05:00:00 <NA>
> > 12 2005-11-14 05:30:00 <NA>
> > 13 2005-11-14 06:00:00 <NA>
> > 14 2005-11-14 06:30:00 <NA>
> > 15 2005-11-14 07:00:00 <NA>
> > 16 2005-11-14 07:30:00 <NA>
> > 17 2005-11-14 08:00:00 <NA>
> > 18 2005-11-14 08:30:00 <NA>
> > 19 2005-11-14 09:00:00 <NA>
> > 20 2005-11-14 09:30:00 <NA>
> > 21 2005-11-14 10:00:00 <NA>
> > 22 2005-11-14 10:30:00 <NA>
> > 23 2005-11-14 11:00:00 <NA>
> > 24 2005-11-14 11:30:00 end
> > 25 2005-11-14 12:00:00 <NA>
> >
> > Why there is <NA> instead of NA?
> > And why
> >
> > df3$pch[df3$event == "start"] <- 24
> >
> > gives a whole column of NA and not 24 at row 6?
> >
> >
> > (oo)
> > --oOO--( )--OOo----------------
> > Stefano Sofia PhD
> > Civil Protection - Marche Region
> > Meteo Section
> > Snow Section
> > Via del Colle Ameno 5
> > 60126 Torrette di Ancona, Ancona
> > Uff: 071 806 7743
> > E-mail: stefano.so...@regione.marche.it
> > ---Oo---------oO----------------
> >
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