> On Jul 15, 2020, at 4:31 AM, andy elprama <andy.elpr...@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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