[R] Conditional operations in R

[ramoss]

Thanks to all who responded, particularly to Michael. Your solution was the
easiest to understand & to implement.
This worked beautifully:

cmtot <- arrange(cmtot, -PCTTOT)#sort by descending
top <- with(cmtot,which.max(cumsum(PCTTOT) >= 50))
topcm <- cmtot[seq(1,top),]







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