metrics: add Counter#print_summary

[nit.git] / src / counter.nit

diff --git a/src/counter.nit b/src/counter.nit
index 14b418d..a9621fe 100644 (file)
--- a/src/counter.nit
+++ b/src/counter.nit
@@ -60,6 +60,36 @@ class Counter[E: Object]
                #res.sort !cmp a, b = map[a] <=> map[b]
                return res
        end
+
+       # Display statistical information
+       fun print_summary
+       do
+               var list = self.sort
+               print " population: {list.length}"
+               if list.is_empty then return
+               print " minimum value: {self[list.first]}"
+               print " maximum value: {self[list.last]}"
+               print " total value: {self.total}"
+               print " average value: {div(self.total,list.length)}"
+               print " distribution:"
+               var count = 0
+               var sum = 0
+               var limit = self[list.first]
+               for t in list do
+                       if self[t] > limit then
+                               print "  <={limit}: sub-population={count} ({div(count*100,list.length)}%); cumulated value={sum} ({div(sum*100,self.total)}%)"
+                               count = 0
+                               sum = 0
+                               while self[t] > limit do
+                                       limit = limit * 2
+                                       if limit == 0 then limit = 1
+                               end
+                       end
+                       count += 1
+                       sum += self[t]
+               end
+               print "  <={limit}: sub-population={count} ({div(count*100,list.length)}%); cumulated value={sum} ({div(sum*100,self.total)}%)"
+       end
 end
 
 private class CounterSorter[E: Object]