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date westerly easterly
2012-01-01T00:00:00 1.0 0.0
2012-01-02T00:00:00 1.0 0.0
2012-01-03T00:00:00 1.0 0.0
2012-01-04T00:00:00 1.0 0.0
2012-01-05T00:00:00 1.0 0.0
2012-01-06T00:00:00 1.0 0.0
2012-01-07T00:00:00 1.0 0.0
2012-01-08T00:00:00 1.0 0.0
2012-01-09T00:00:00 1.0 0.0
rows$roll <- cumsum(rows$westerly) / seq_along(rows$westerly)
var t = [1,2,3];
console.log(t[0]);