ceiling
takes a single numeric argument
x
and returns a numeric vector containing 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 largest integers not greater than the corresponding elements of
x
.
trunc
takes a single numeric argument
x
and returns a numeric vector containing the integers formed by truncating the values in
x
toward
0
.
round
rounds the values in its first argument to the specified number of decimal places (default 0).
signif
取几位有效数字 rounds the values in its first argument to the specified number of significant digits.
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