Nothing
`row2col` <-
function(k){
vec<-numeric(k*(k-1)/2)
r<-c(0,cumsum((k-2):1))
id<-cumsum(0:(k-1))
for(i in 1:(k-1))
vec[(id[i]+1):id[i+1]]<-i+r[1:i]
vec
}
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