--- a/numerics/data.py	Mon Jan 19 12:13:06 2015 -0800
+++ b/numerics/data.py	Mon Jan 19 12:38:51 2015 -0800
@@ -6,7 +6,7 @@
 
 from collections import OrderedDict
 
-__all__ = ['Rows', 'Columns']
+__all__ = ['ColumnNumberException', 'ColumnLengthException', 'Rows', 'Columns']
 
 
 class ColumnNumberException(Exception):
@@ -19,6 +19,16 @@
         Exception.__init__(self.__doc__.format(**self.__dict__).strip())
 
 
+def transpose(array):
+    """makes rows into columns or vice versa"""
+
+    if not array:
+        return array  # nothing to do
+
+    n_cols = len(array[0])
+    retval = []] * n_cols
+    raise NotImplementedError('TODO') # -> record TODO items
+
 class ColumnLengthException(ColumnNumberException):
     """
     wrong length of column: {given} given; {expected} expected
@@ -69,5 +79,4 @@
     def __iadd__(self, item):
         column_name, values = item
         assert column_name not in self.columns
-        
         return self