Hi Stefano, my guess is that you're expecting data recycling to apply but your data frame is only one row long... therefore you can't insert a 2-row vector into a 1-row vector. Recycling won't help.
You should specify the number of rows that will be required in your data frame using (e.g) rep(). (here I use 10 rows as an example) mydf <- data.frame(data_POSIX=rep(as.POSIXct(NA), 10), value=as.numeric(NA)) Olivier. On Thu, 24 Jun 2021 13:34:31 +0000 Stefano Sofia <stefano.so...@regione.marche.it> wrote: > Dear R users, > I know that this question is silly (I am not a R newby) but I already > wasted quite a lot of energies trying to fill in an empty data frame > (with "POSIXct" "POSIXt" data type). > > Suppose I create > mydf <- data.frame(data_POSIX=as.POSIXct(NA), value=as.numeric(NA)) > day1 <- as.POSIXct("2018-02-01-00-00", format="%Y-%m-%d-%H-%M", > tz="Etc/GMT-1") day2 <- as.POSIXct("2018-02-02-00-00", > format="%Y-%m-%d-%H-%M", tz="Etc/GMT-1") > > then > mydf$data_POSIX <- c(day1, day2) > > does not work, it gives me: > "Error in `$<-.data.frame`(`*tmp*`, data_POSIX, value = c(1517439600, > 1517612400 : replacement has 2 rows, data has 1" > > There are few basic concepts that I am missing. > Why c(day1, day2) is not a vector? > Why I am not able to populate my data frame? > > Could somebody please give me the right hints? > Thank you for your precious 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---------------------------------------- > > ________________________________ > > AVVISO IMPORTANTE: Questo messaggio di posta elettronica può > contenere informazioni confidenziali, pertanto è destinato solo a > persone autorizzate alla ricezione. I messaggi di posta elettronica > per i client di Regione Marche possono contenere informazioni > confidenziali e con privilegi legali. Se non si è il destinatario > specificato, non leggere, copiare, inoltrare o archiviare questo > messaggio. Se si è ricevuto questo messaggio per errore, inoltrarlo > al mittente ed eliminarlo completamente dal sistema del proprio > computer. Ai sensi dell’art. 6 della DGR n. 1394/2008 si segnala che, > in caso di necessità ed urgenza, la risposta al presente messaggio di > posta elettronica può essere visionata da persone estranee al > destinatario. IMPORTANT NOTICE: This e-mail message is intended to be > received only by persons entitled to receive the confidential > information it may contain. E-mail messages to clients of Regione > Marche may contain information that is confidential and legally > privileged. Please do not read, copy, forward, or store this message > unless you are an intended recipient of it. If you have received this > message in error, please forward it to the sender and delete it > completely from your computer system. > > -- > Questo messaggio stato analizzato da Libraesva ESG ed risultato non > infetto. This message was scanned by Libraesva ESG and is believed to > be clean. > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. -- Olivier Crouzet, PhD http://olivier.ghostinthemachine.space /Maître de Conférences/ @LLING - Laboratoire de Linguistique de Nantes UMR6310 CNRS / Université de Nantes ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.