search for: topflow

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2010 Mar 09
3
sorting data whilst ignoring NA's
...A [10,] 11 10 1945 NA [11,] 12 10 1945 NA [12,] 13 10 1945 NA [13,] 14 10 1945 2.973 [14,] 15 10 1945 NA I want to sort the data in descending order by flow but with all the NA results sent to the bottom. I have managed to sort the data using: topflows <- qdata[order(-flow, na.last=TRUE),] But this sorts the data by flow value and then year I think giving: day month year flow [1,] 14 3 1947 222.40 [2,] 15 3 1947 NA [3,] 18 3 1947 NA [4,] 17 3 1947 NA [5,] 19 3 1947 NA [6,] 12 3 1947...