diff --git a/processing/post/postResults.py b/processing/post/postResults.py
index dc6cff592..db9801c48 100755
--- a/processing/post/postResults.py
+++ b/processing/post/postResults.py
@@ -479,13 +479,13 @@ def mapIncremental(label, mapping, N, base, new):
 # to a list of data
 # -----------------------------
 
-  theMap =  { 'min': lambda n,b,a: min(b,a),
-              'max': lambda n,b,a: max(b,a),
+  theMap =  { 'min': lambda n,b,a: a if n==0 else min(b,a),
+              'max': lambda n,b,a: a if n==0 else max(b,a),
               'avg': lambda n,b,a: (n*b+a)/(n+1),
               'avgabs': lambda n,b,a: (n*b+abs(a))/(n+1),
-              'sum': lambda n,b,a: b+a,
-              'sumabs': lambda n,b,a: b+abs(a),
-              'unique': lambda n,b,a: {True:a,False:'n/a'}[n==0 or b==a]
+              'sum': lambda n,b,a: a if n==0 else b+a,
+              'sumabs': lambda n,b,a: abs(a) if n==0 else b+abs(a),
+              'unique': lambda n,b,a: a if n==0 or b==a else 'n/a'
             }
   if mapping in theMap:
     mapped = map(theMap[mapping],[N]*len(base),base,new)                        # map one of the standard functions to data