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% File src/library/base/man/strtoi.Rd
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% File src/library/base/man/strtoi.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 2009-10 R Core Team
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% Copyright 2009-2010 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{strtoi}
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\name{strtoi}
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\alias{strtoi}
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\alias{strtoi}
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\title{Convert Strings to Integers}
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\title{Convert Strings to Integers}
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Conversion is based on the C library function \code{strtol}.
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Conversion is based on the C library function \code{strtol}.
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For the default \code{base = 0L}, the base chosen from the string
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For the default \code{base = 0L}, the base chosen from the string
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representation of that element of \code{x}, so different elements can
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representation of that element of \code{x}, so different elements can
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have different bases (see the first example). The standard C rules
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have different bases (see the first example). The standard C rules
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for choosing the base are that octal constants (prefix \code{0} not
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for choosing the base are that octal constants (prefix \samp{0} not
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followed by \code{x} or \code{X}) and hexadecimal constants (prefix
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followed by \samp{x} or \samp{X}) and hexadecimal constants (prefix
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\code{0x} or \code{0X}) are interpreted as base \code{8} and
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\samp{0x} or \samp{0X}) are interpreted as base \code{8} and
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\code{16}; all other strings are interpreted as base \code{10}.
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\code{16}; all other strings are interpreted as base \code{10}.
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For a base greater than \code{10}, letters \code{a} to \code{z} (or
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For a base greater than \code{10}, letters \samp{a} to \samp{z} (or
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\code{A} to \code{Z}) are used to represent \code{10} to \code{35}.
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\samp{A} to \samp{Z}) are used to represent \code{10} to \code{35}.
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}
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}
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\value{
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\value{
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An integer vector of the same length as \code{x}. Values which cannot
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An integer vector of the same length as \code{x}. Values which cannot
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be interpreted as integers or would overflow are returned as
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be interpreted as integers or would overflow are returned as
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\code{\link{NA_integer_}}.
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\code{\link{NA_integer_}}.
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