Hello,
Inline.
Às 15:27 de 24/06/21, Stefano Sofia escreveu:
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,
But the data.frame is not empty, it has one row with perfectly valid NA's.
mydf
# data_POSIX value
#1 <NA> NA
You can rbind an empty df with another with the new values.
mydf2 <- data.frame()
mydf2
#data frame with 0 columns and 0 rows
rbind(mydf2, data.frame(data_POSIX = c(day1, day2), value = NA))
# data_POSIX value
#1 2018-02-01 NA
#2 2018-02-02 NA
But once again assignment will fail, and for the same reason.
Hope this helps,
Rui Barradas
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.so...@regione.marche.it
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________________________________________
Da: Jeff Newmiller [jdnew...@dcn.davis.ca.us]
Inviato: giovedì 24 giugno 2021 15.46
A: r-help@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.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----------------------------------------
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