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% File src/library/base/man/sum.Rd
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% File src/library/base/man/sum.Rd
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% Part of the R package, http://www.R-project.org
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% Part of the R package, http://www.R-project.org
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% Copyright 1995-2011 R Core Team
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% Copyright 1995-2013 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{sum}
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\name{sum}
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\alias{sum}
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\alias{sum}
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\title{Sum of Vector Elements}
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\title{Sum of Vector Elements}
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  be returned, otherwise \code{NA} and \code{NaN} values are ignored.
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  be returned, otherwise \code{NA} and \code{NaN} values are ignored.
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  Logical true values are regarded as one, false values as zero.
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  Logical true values are regarded as one, false values as zero.
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  For historical reasons, \code{NULL} is accepted and treated as if it
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  For historical reasons, \code{NULL} is accepted and treated as if it
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  were \code{integer(0)}.
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  were \code{integer(0)}.
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  Loss of accuracy can occur when summing values of different signs:
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  this can even occur for sufficiently long integer inputs if the
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  partial sums would cause integer overflow.  Where possible
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  extended-precision accumulators are used, but this is
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  platform-dependent.
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}
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}
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\section{S4 methods}{
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\section{S4 methods}{
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  This is part of the S4 \code{\link[=S4groupGeneric]{Summary}}
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  This is part of the S4 \code{\link[=S4groupGeneric]{Summary}}
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  group generic.  Methods for it must use the signature
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  group generic.  Methods for it must use the signature
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  \code{x, \dots, na.rm}.
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  \code{x, \dots, na.rm}.