Returns the number of rows and columns for an H2OFrame object.
h2o.dim(x)dim for the base R implementation.
if (FALSE) { # \dontrun{
library(h2o)
h2o.init()
f <- "https://s3.amazonaws.com/h2o-public-test-data/smalldata/junit/cars_20mpg.csv"
cars <- h2o.importFile(f)
h2o.dim(cars)
} # }