The list 6 9 3 1 has left and right sublists 6 9 and 3 1, the list 6 9 3 1 4 has left and right sublists 6 9 and 1 4 . The middle number, if there is one, is not included in the left and right sublists.
You know the median of 6 9 3 1 is the median of 1 3 6 9 which is 4.5, and the median of 6 9 3 1 4 is the median of 1 3 4 6 9 which is 4. The "fourths" f1 and f4 of a list y are respectively the medians of the left sublist and right sublist of /:~ y . Write a verb to find John Tukey's "five number summary" minimum , f1 , median, f3 , maximum of a list y. --Kip Murray -- Sent from Gmail Mobile ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
