add readme

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 22 insertions, 0 deletions

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+Calculate the median values for a set of groups.
+
+
+median takes the first blank space-separated column
+values and the remainder as keys. It will then print
+the median for each key. As a side effect median will
+will print the result sorted by the keys.
+
+Usage example:
+
+$ cat <<EOF | ./median
++003  c
+.001  a
+-002  b
++001  c
+-001  b
++002  c
+EOF
+.001  a
+-001.5  b
++002  c
+