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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