diff options
| -rw-r--r-- | r.html.markdown | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/r.html.markdown b/r.html.markdown index e90d5a97..e42b1f5e 100644 --- a/r.html.markdown +++ b/r.html.markdown @@ -4,6 +4,7 @@ contributors: - ["e99n09", "http://github.com/e99n09"] - ["isomorphismes", "http://twitter.com/isomorphisms"] - ["kalinn", "http://github.com/kalinn"] + - ["mribeirodantas", "http://github.com/mribeirodantas"] filename: learnr.r --- @@ -405,7 +406,7 @@ mat # [2,] 2 5 # [3,] 3 6 # Unlike a vector, the class of a matrix is "matrix", no matter what's in it -class(mat) # => "matrix" +class(mat) # => "matrix" "array" # Ask for the first row mat[1,] # 1 4 # Perform operation on the first column @@ -478,9 +479,10 @@ class(students[,3]) # "factor" nrow(students) # 6 ncol(students) # 3 dim(students) # 6 3 -# The data.frame() function converts character vectors to factor vectors -# by default; turn this off by setting stringsAsFactors = FALSE when -# you create the data.frame +# The data.frame() function used to convert character vectors to factor +# vectors by default; This has changed in R 4.0.0. If your R version is +# older, turn this off by setting stringsAsFactors = FALSE when you +# create the data.frame ?data.frame # There are many twisty ways to subset data frames, all subtly unalike |