| strtoi {base} | R Documentation |
Convert Strings to Integers
Description
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
|
base |
an integer which is between 2 and 36 inclusive, or zero (default). |
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.
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_.
See Also
For decimal strings as.integer is equally useful.
Examples
strtoi(c("0xff", "077", "123"))
strtoi(c("ffff", "FFFF"), 16L)
strtoi(c("177", "377"), 8L)