I take this case as cut a data set by breaks and assign each segment a label
name.
a <- data.frame(timestamp=c(3,5,8), mylabel=c("abc","def","ghi"))
b <- data.frame(timestamp=c(1:10))
bks <- c(a$timestamp,max(b$timestamp))
lbs <- a$mylabel
b$label <- cut(b$timestamp, breaks=bks, labels=lbs, include.lowest = T,
right=T)
-----
A R learner.
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