Mercurial > hg > numerics

changeset 51:e7e49b46832b

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make this function semi-meaningful
author Jeff Hammel <k0scist@gmail.com>
date Mon, 19 Jan 2015 12:51:25 -0800
parents e39643d18d82
children 37838ae694d2
files numerics/data.py
diffstat 1 files changed, 10 insertions(+), 4 deletions(-) [+]
line wrap: on
line diff
--- a/numerics/data.py	Mon Jan 19 12:45:06 2015 -0800
+++ b/numerics/data.py	Mon Jan 19 12:51:25 2015 -0800
@@ -6,7 +6,11 @@
 
 from collections import OrderedDict
 
-__all__ = ['ColumnNumberException', 'ColumnLengthException', 'Rows', 'Columns']
+__all__ = ['ColumnNumberException',
+           'ColumnLengthException',
+           'transpose',
+           'Rows',
+           'Columns']
 
 
 class ColumnNumberException(Exception):
@@ -25,10 +29,12 @@
     if not array:
         return array  # nothing to do
 
-    n_cols = len(array[0])
-    retval = [[]] * n_cols
+    n_cols = set([len(row) for row in array])
+    if len(n_cols) != 1:
+        raise Exception("Differing number of columns found: {}".format(', '.join(sorted(n_cols))))
+
     return zip(*array)
-    # XXX this is a nothing function; we shouldn't use this
+
 
 class ColumnLengthException(ColumnNumberException):
     """