Convert strings to integers according to the given base using the C
function strtol, or choose a suitable base following the C rules.

Usage

strtoi(x, base = 0L)

Arguments

x

a character vector, or something coercible to this by
as.character.

base

an integer which is between 2 and 36 inclusive, or zero
(default).

Value

An integer vector of the same length as x. Values which cannot
be interpreted as integers or would overflow are returned as
NA_integer_.

Details

Conversion is based on the C library function strtol.

For the default base = 0L, the base chosen from the string
representation of that element of x, so different elements can
have different bases (see the first example). The standard C rules
for choosing the base are that octal constants (prefix 0 not
followed by x or X) and hexadecimal constants (prefix
0x or 0X) are interpreted as base 8 and
16; all other strings are interpreted as base 10.

For a base greater than 10, letters a to z (or
A to Z) are used to represent 10 to 35.