Data structures


# create & delete variables
x=5 # create variable
ls() # show (list) all  variables
 "x"
rm(x) # delete variable

# clear (clean up) - delete all variables in R
rm(list=ls()) 



# check data type of a variable

x = 5
typeof(x)
   "double"
class(x)
   "numeric"


y = data.frame("A" = c(12,52,14), "B" = c(81,32,65))
typeof(y)
  "list"
class(y)
  "data.frame"


# convert data.frame into numerical matrix (double)
z = data.matrix(y)
typeof(z)
  "double"
class(z)
  "matrix"






Subpages (2): Dataframe Size