fix colonProduct loops

stuff/math.hh

@@ -35,12 +35,13 @@ static double colonProduct(const SomeRangeType& arg1, const OtherRangeType& arg2
   ConstRowIteratorType arg1RowItEnd = arg1.end();
   ConstRowIteratorType arg2RowItEnd = arg2.end();
   ConstRowIteratorType arg2RowIt = arg2.begin();
-  for (ConstRowIteratorType arg1RowIt = arg1.begin(); arg1RowIt != arg1RowItEnd, arg2RowIt != arg2RowItEnd;
+  for (ConstRowIteratorType arg1RowIt = arg1.begin(); arg1RowIt != arg1RowItEnd && arg2RowIt != arg2RowItEnd;
        ++arg1RowIt, ++arg2RowIt) {
     ConstIteratorType row1ItEnd = arg1RowIt->end();
     ConstIteratorType row2ItEnd = arg2RowIt->end();
     ConstIteratorType row2It = arg2RowIt->begin();
-    for (ConstIteratorType row1It = arg1RowIt->begin(); row1It != row1ItEnd, row2It != row2ItEnd; ++row1It, ++row2It) {
+    for (ConstIteratorType row1It = arg1RowIt->begin(); row1It != row1ItEnd && row2It != row2ItEnd;
+         ++row1It, ++row2It) {
       ret += *row1It * *row2It;
     }
   }