Nothing
`centre.log` <-
function(mat)
{
mat[mat<=0] <- NA
mat <- log(mat)
mat <- mat[,apply(mat,2,function(x) sum(!is.na(x))>2)]
apply(mat,2,function(x) (x-min(x, na.rm=TRUE))/diff(range(x,na.rm=TRUE)))
}
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