Hi -- there are lots of replies --I have not read them all, if someone else 
suggested this, sorry for duplication. This is similar to the suggestion using 
mapply, but not specific to matrices. In fact it's a kludge that applies to 
many settings. You 'sapply' over the index 1:2, and pass a, b as arguments:


a <- c(1,4)
 b <- c(5,8)

sapply(1:2, FUN=function(x, a, b)a[x]:b[x], a=a,b=b)


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