Nothing
## return the sum of an array while keeping its attributes
sumKeepAttr <- function( x, keepNames = FALSE, na.rm = FALSE ) {
xAttr <- attributes( x )
if( !keepNames ) {
xAttr$names <- NULL
}
x <- sum( x, na.rm = na.rm )
mostattributes( x ) <- xAttr
return( x )
}
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