| strtoi {base} | R Documentation |
Convert strings to integers according to the given base using the C
function strtol, or choose a suitable base following the C rules.
strtoi(x, base = 0L)
x |
a character vector, or something coercible to this by
|
base |
an integer which is between 2 and 36 inclusive, or zero (default). |
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.
An integer vector of the same length as x. Values which cannot
be interpreted as integers or would overflow are returned as
NA_integer_.
For decimal strings as.integer is equally useful.
strtoi(c("0xff", "077", "123"))
strtoi(c("ffff", "FFFF"), 16L)
strtoi(c("177", "377"), 8L)