Home/ Questions/Q 8866499
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-14T16:47:58+00:00

I’m trying to make a simple subset of a df based on a POSIXct

  • 0

I’m trying to make a simple subset of a df based on a POSIXct variable, but it doesn’t work…

a2001 <- subset(anillas, anillas$data=="21-03-2001")

it gives “0 obs. of 74 variables”

are those variables different in any way I don’t know?

Tks.

Ok, so this is part of the str(anillas)

 $ rc          : num  NA NA NA NA NA NA NA NA NA NA ...
 $ ss          : num  NA NA NA NA NA NA NA NA NA NA ...
 $ tg          : num  NA NA NA NA NA NA NA NA NA NA ...
 $ ug          : num  NA NA NA NA NA NA NA NA NA NA ...
 $ data        : POSIXct, format: "2001-03-21" "2001-03-23" ...
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    You have to compare with what’s comparable. In your attempt you compared a POSIXct object with a character string.
    You need first to convert the date you want to subset anillas with to POSIXct:

    date1 <- strptime("21-03-2001","%d-%m-%Y")
a2001 <- subset(anillas, data==date1)
    • 0