ceiling(x) floor(x) round(x, digits=0) signif(x, digits) trunc(x)
ceiling takes a single numeric argument x and returns
a numeric vector containing the the smallest integers not less than
the corresponding elements of x.
floor takes a single numeric argument x and returns a
numeric vector containing the the largest integers not greater than
the corresponding elements of x.
round rounds the values in its first argument to the specified
number of decimal places (default 0).
signif rounds the the values in its first argument to the specified
number of significant digits.
trunc takes a single numeric argument x and returns a
numeric vector containing the the integers by truncating the values
in x toward 0.