--- a/numerics/mean.py	Mon Mar 16 19:55:41 2015 -0700
+++ b/numerics/mean.py	Mon Mar 16 20:00:43 2015 -0700
@@ -8,30 +8,16 @@
 # imports
 import sys
 from .filters import mean
-from .manipulate import FloatParser
-from .write import CSVWriter
+from .reduce import ReduceParser
+
 
 __all__ = ['main']
 
 
 def main(args=sys.argv[1:]):
     """CLI"""
-
-    # parse command line options
-    parser = FloatParser()
-    options = parser.parse_args(args)
+    ReduceParser(mean)(*args)
 
-    # read data
-    columns = parser.typed_data()
-    if not columns:
-        parser.error("No data given")
-
-    # calculate means
-    means = [mean(column) for column in columns]
-
-    # write CSV
-    writer = CSVWriter(options.output)
-    writer.write([means])
 
 if __name__ == '__main__':
     main()

--- a/numerics/reduce.py	Mon Mar 16 19:55:41 2015 -0700
+++ b/numerics/reduce.py	Mon Mar 16 20:00:43 2015 -0700
@@ -18,13 +18,14 @@
 class ReduceParser(FloatParser):
     """CLI option parser"""
 
-    # reducing function
-    function = lambda x: raise NotImplemented("Abstract base class")
+    def __init__(self, function, **kwargs):
+        """
+        function -- reducing function
+        """
 
-    def __init__(self, **kwargs):
+        self.function = function
         kwargs.setdefault('description', __doc__)
-        argparse.ArgumentParser.__init__(self, **kwargs)
-        self.options = None
+        FloatParser.__init__(self, **kwargs)
 
     def __call__(self, *args):
 
@@ -37,8 +38,8 @@
             self.error("No data given")
 
         # calculate scalars
-        data = [self.function(column) for column in column]
+        data = [self.function(column) for column in columns]
 
         # write CSV
-        writer = CSVWriter(options.output)
+        writer = CSVWriter(self.options.output)
         writer.write([data])