R: Convert Strings to Integers (original) (raw)
| strtoi {base} | R Documentation |
|---|
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 byas.character. |
|---|---|
| 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 (prefix0x or 0X) are interpreted as base 8 and16; all other strings are interpreted as base 10.
For a base greater than 10, letters a to z (orA 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_](../../base/help/NA%5Finteger%5F.html).
See Also
For decimal strings [as.integer](../../base/help/as.integer.html) is equally useful.
Examples
strtoi(c("0xff", "077", "123"))
strtoi(c("ffff", "FFFF"), 16L)
strtoi(c("177", "377"), 8L)
[Package _base_ version 4.6.0 Index]