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)
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Stefano Sofia PhD
Civil Protection - Marche Region - Italy
Meteo Section
Snow Section
Via del Colle Ameno 5
60126 Torrette di Ancona, Ancona (AN)
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E-mail: stefano.sofia at regione.marche.it
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