Hello all: I have a dataframe f of weekdays and value, and a Boolean vector with Fridays set to true, and other days set to false, created by fridays<-(diff(f$weekdays) < -1). I would like to create a vector of sums, for each week. That is, start summing on the first false value in the vector, and when I get to true, produce the sum, and start summing again. Is there a vector operation which can do this, without writing an explicit loop? Thank you, Dan Stanger P.S. Sorry about the repost. Eaton Vance Management 200 State Street Boston, MA 02109 617 598 8261
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