diff options
Diffstat (limited to 'r.html.markdown')
| -rw-r--r-- | r.html.markdown | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/r.html.markdown b/r.html.markdown index c555d748..d3d725d3 100644 --- a/r.html.markdown +++ b/r.html.markdown @@ -229,6 +229,13 @@ FALSE != FALSE # FALSE FALSE != TRUE # TRUE # Missing data (NA) is logical, too class(NA) # "logical" +# Use | and & for logic operations. +# OR +TRUE | FALSE # TRUE +# AND +TRUE & FALSE # FALSE +# You can test if x is TRUE +isTRUE(TRUE) # TRUE # Here we get a logical vector with many elements: c('Z', 'o', 'r', 'r', 'o') == "Zorro" # FALSE FALSE FALSE FALSE FALSE c('Z', 'o', 'r', 'r', 'o') == "Z" # TRUE FALSE FALSE FALSE FALSE @@ -252,6 +259,7 @@ levels(infert$education) # "0-5yrs" "6-11yrs" "12+ yrs" # NULL # "NULL" is a weird one; use it to "blank out" a vector class(NULL) # NULL +parakeet = c("beak", "feathers", "wings", "eyes") parakeet # => # [1] "beak" "feathers" "wings" "eyes" |