Export data.table:::uniqlist for external use
@jangorecki is already working on this.
Since Apr 10, 2020.
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Description
uniqlist is useful to detect whether there's a change in value in an R's data frame. (For example, check if a variable change values in time series data.)
See this StackOverflow question, which shows that there's no readable alternative to uniqlist
x = data.frame(cnt=1:10, code=rep('ELEMENT 1',10), val0=rep(5,10), val1=rep(6,10),val2=rep(3,10))
x[4,]$val0=6
data.table:::uniqlist(x[, 3:5])
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