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% File src/library/utils/man/compareVersion.Rd
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% File src/library/utils/man/compareVersion.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 1995-2007 R Core Team
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% Copyright 1995-2024 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{compareVersion}
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\name{compareVersion}
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\alias{compareVersion}
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\alias{compareVersion}
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\title{Compare Two Package Version Numbers}
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\title{Compare Two Package Version Numbers}
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}
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}
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\value{
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\value{
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  \code{0} if the numbers are equal, \code{-1} if \code{b} is later
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  \code{0} if the numbers are equal, \code{-1} if \code{b} is later
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  and \code{1} if \code{a} is later (analogous to the C function
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  and \code{1} if \code{a} is later (analogous to the C function
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  \code{strcmp}).
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  \code{strcmp}).
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  Gives an \R error on malformed inputs.
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}
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}
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\details{
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\details{
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  \R package version numbers are of the form \code{x.y-z} for integers
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  \R package version numbers are of the form \code{x.y-z} for integers
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  \code{x}, \code{y} and \code{z}, with components after \code{x}
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  \code{x}, \code{y} and \code{z}, with components after \code{x}
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  optionally missing (in which case the version number is older than
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  optionally missing (in which case the version number is older than