Sorry for the delay of my reply, I have been out of office for few days.
Thank you to all of you.
Both solutions work well; fortunately the structure of the data frames is
identical, rbind works perfectly and this second solution is slightly easier to
implement for me.
Thank you again for your help
Stefano
(oo)
--oOO--( )--OOo--------------------------------------
Stefano Sofia PhD
Civil Protection - Marche Region - Italy
Meteo Section
Snow Section
Via del Colle Ameno 5
60126 Torrette di Ancona, Ancona (AN)
Uff: +39 071 806 7743
E-mail: stefano.so...@regione.marche.it
---Oo---------oO----------------------------------------
________________________________
Da: Bert Gunter <bgunter.4...@gmail.com>
Inviato: giovedì 15 dicembre 2022 18:31
A: Gerrit Eichner; Stefano Sofia
Cc: r-help@r-project.org
Oggetto: Re: [R] Get data from a list of data frames
Well, just for giggles, Gerrit's solution can be easily vectorized (i.e. no
apply()-type stuff needed) IFF the structure of all the data frames are
identical so that rbind() works:
d <-do.call('rbind',Total[select.stat]) ## one data frame to combine them all
;-)
d[d$sensor == 'thermometer','code']
Whether this is better, worse, or unneeded, I cannot say.
Cheers,
Bert
On Thu, Dec 15, 2022 at 6:11 AM Gerrit Eichner
<gerrit.eich...@math.uni-giessen.de<mailto:gerrit.eich...@math.uni-giessen.de>>
wrote:
Hello, Stefano,
maybe the following example contains what you want to achieve:
Station1 <- data.frame(sensor = c("thermometer", "raingauge",
"snowgauge", "anemometer"),
code = c(2583, 1478, 3178, NA))
Station2 <- data.frame(sensor = c("thermometer", "raingauge",
"snowgauge", "anemometer"),
code = c(2584, 1479, 3179, 4453))
Station3 <- data.frame(sensor = c("thermometer", "raingauge",
"snowgauge", "anemometer"),
code = c(2584, 1479, 3179, 4453))
Station4 <- data.frame(sensor = rev(c("thermometer", "raingauge",
"snowgauge", "anemometer")),
code = c(2584, 1479, 3179, 4453))
Station5 <- data.frame(sensor = c("raingauge", "snowgauge",
"thermometer", "anemometer"),
code = c(2584, 1479, 3179, 4453))
Total <- list("Station1"=Station1, "Station2"=Station2,
Station3 = Station3, Station4 = Station4,
Station5 = Station5)
select.stat <- paste0("Station", c(1, 4, 5))
select.sens <- "thermometer"
sapply(Total[select.stat], function(x, sens)
x$code[x$sensor == sens], sens = select.sens)
Hth -- Gerrit
---------------------------------------------------------------------
Dr. Gerrit Eichner Mathematical Institute, Room 212
gerrit.eich...@math.uni-giessen.de<mailto:gerrit.eich...@math.uni-giessen.de>
Justus-Liebig-University Giessen
Tel: +49-(0)641-99-32104 Arndtstr. 2, 35392 Giessen, Germany
http://www.uni-giessen.de/eichner<https://urlsand.esvalabs.com/?u=http%3A%2F%2Fwww.uni-giessen.de%2Feichner&e=5a635173&h=6288e95a&f=y&p=y>
---------------------------------------------------------------------
Am 15.12.2022 um 14:52 schrieb Stefano Sofia:
> Dear R-list users,
>
> I have a list of n data frames built as follows:
>
>
> Station1 <- data.frame(sensor = c("thermometer", "raingauge", "snowgauge",
> "anemometer"), code = c(2583, 1478, 3178, NA))
> Station2 <- data.frame(sensor = c("thermometer", "raingauge", "snowgauge",
> "anemometer"), code = c(2584, 1479, 3179, 4453))
> ....
>
> Total <- list("Station1"=Station1, "Station2"=Station2, ...)
>
> I would need to have a vector with the sensor codes of the thermometers of
> some stations, let's say of Station1, Station2 and Station5 (i.e. c(2583,
> 2584, 2587)).
> I tried with lapply, but I have not been able to get what I need.
> Could you please help me?
>
> Thank you
>
> Stefano
>
>
>
> (oo)
> --oOO--( )--OOo--------------------------------------
> Stefano Sofia PhD
> Civil Protection - Marche Region - Italy
> Meteo Section
> Snow Section
> Via del Colle Ameno 5
> 60126 Torrette di Ancona, Ancona (AN)
> Uff: +39 071 806 7743
> E-mail:
> stefano.so...@regione.marche.it<mailto:stefano.so...@regione.marche.it>
> ---Oo---------oO----------------------------------------
>
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