Thank you Jeff and thank you Andrew
1) Yes, I understand that it is a vector, even though is.vector(c(day1, day2))
is FALSE. Andrew explained to me why: it has attributes 'class' and
'tzone'.
2) I understand now that I created a data frame with only one row, and I am
trying to fit a vector of length 2. I thought that, once created an empty data
frame, I could fit any vector without specifying the length since the beginning.
Now I will think about it.
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.sofia at regione.marche.it
---Oo---------oO----------------------------------------
________________________________________
Da: Jeff Newmiller [jdnewmil at dcn.davis.ca.us]
Inviato: gioved? 24 giugno 2021 15.46
A: r-help at r-project.org; Stefano Sofia; r-help mailing list
Oggetto: Re: [R] empty data frame and POSIXct data types
1) It _is_ a vector. Why do you think it is not a vector?
2) Your data frame has one row, with an NA in the date_POSIX column. You cannot
fit a vector of length 2 as a column into a data frame with only 1 row.
What are you trying to do? Do you really want to end up with a 2-row data frame
or a 3 row data frame?
On June 24, 2021 6:34:31 AM PDT, Stefano Sofia <stefano.sofia at
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.sofia at regione.marche.it
>---Oo---------oO----------------------------------------
>
>________________________________
>
>AVVISO IMPORTANTE: Questo messaggio di posta elettronica pu? contenere
>informazioni confidenziali, pertanto ? 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 ? il destinatario specificato, non
>leggere, copiare, inoltrare o archiviare questo messaggio. Se si ?
>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 necessit?
>ed urgenza, la risposta al presente messaggio di posta elettronica pu?
>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 at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>
https://urlsand.esvalabs.com/?u=https%3A%2F%2Fstat.ethz.ch%2Fmailman%2Flistinfo%2Fr-help&e=5a635173&h=06ff70f3&f=y&p=y
>PLEASE do read the posting guide
>
https://urlsand.esvalabs.com/?u=http%3A%2F%2Fwww.R-project.org%2Fposting-guide.html&e=5a635173&h=e12f63e8&f=y&p=y
>and provide commented, minimal, self-contained, reproducible code.
--
Sent from my phone. Please excuse my brevity.
--
Questo messaggio stato analizzato con Libraesva ESG ed risultato non infetto.
________________________________
AVVISO IMPORTANTE: Questo messaggio di posta elettronica pu? contenere
informazioni confidenziali, pertanto ? 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 ?
il destinatario specificato, non leggere, copiare, inoltrare o archiviare questo
messaggio. Se si ? 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 necessit? ed urgenza, la
risposta al presente messaggio di posta elettronica pu? 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.