Thanks, I will check it out.
Op za 18 jul. 2020 om 00:47 schreef Chris Gordon-Smith <
c.gordonsmith at gmail.com>:
> There is an interesting item on stringsAsFactors in this useR! 2020
> session:
>
> https://www.youtube.com/watch?v=X_eDHNVceCU&feature=youtu.be
>
> It's about 27 minutes in.
>
> Chris Gordon-Smith
> On 15/07/2020 17:16, Marc Schwartz via R-help wrote:
>
> On Jul 15, 2020, at 4:31 AM, andy elprama <andy.elprama at gmail.com>
<andy.elprama at gmail.com> wrote:
>
> Dear R-users,
>
> Something strange happened within the command "levels"
>
> R version 3.6.1
> name <- c("a","b","c")
> values <- c(1,2,3)
> data <- data.frame(name,values)
> levels(data$name)
> [1] "a" "b" "c"
>
> R version 4.0
> name <- c("a","b","c")
> values <- c(1,2,3)
> data <- data.frame(name,values)
> levels(data$name)
> [1] NULL
>
> What is happening here?
>
> Hi,
>
> The default value for 'stringsAsFactors' for data.frame() and
read.table() changed from TRUE to FALSE in version 4.0.0, per the news() file:
>
> "R now uses a stringsAsFactors = FALSE default, and hence by default
no longer converts strings to factors in calls to data.frame() and
read.table()."
>
>
> Using 4.0.2:
>
> data <- data.frame(name, values, stringsAsFactors = TRUE)
>
>
> levels(data$name)
>
> [1] "a" "b" "c"
>
>
> If you see behavioral changes from one version of R to another, especially
major version increments, check the news() file.
>
> Regards,
>
> Marc Schwartz
>
>
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