subset.uncertainty <-
function(x, subset=NULL, ...)
{
if (is.null(subset))
return(x)
if (any(is.na(subset)))
stop("subset should not contain NA")
out <- x
out$uncertainty <- x$uncertainty[subset]
if (length(out$uncertainty) < 1L)
stop("no species left in subset")
out$Y <- x$Y[,subset,drop=FALSE]
out
}
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