[R] empty data frame and POSIXct data types

[Jeff Newmiller]

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 using 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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