rangeCol<-function(x, na.rm = FALSE){
rancol<-matrix(NA,nrow=2,ncol=ncol(x))
for(i in 1:ncol(x)){rancol[,i]<-range(x[,i], na.rm = na.rm)}
rownames(rancol)<-c("min","max")
return(rancol)
}
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