adding reindex_like functions

pandas/core/frame.py

@@ -1005,6 +1005,26 @@ def _reindex_columns(self, columns):
 
         return result
 
+    def reindex_like(self, other, fillMethod=None):
+        """
+        Reindex DataFrame to match indices of another DataFrame
+
+        Parameters
+        ----------
+        other : DataFrame
+        fillMethod : string or None
+
+        Notes
+        -----
+        Like calling s.reindex(index=other.index, columns=other.columns)
+
+        Returns
+        -------
+        reindexed : DataFrame
+        """
+        # todo: object columns
+        return self.reindex(index=other.index, columns=other.columns)
+
     def groupby(self, mapper, axis=0):
         """
         Goup series using mapper (dict or key function, apply given

pandas/core/series.py

@@ -808,6 +808,25 @@ def reindex(self, newIndex, fillMethod=None):
 
         return Series(newValues, index=newIndex)
 
+    def reindex_like(self, other, fillMethod=None):
+        """
+        Reindex Series to match index of another Series
+
+        Parameters
+        ----------
+        other : Series
+        fillMethod : string or None
+
+        Notes
+        -----
+        Like calling s.reindex(other.index)
+
+        Returns
+        -------
+        reindexed : Series
+        """
+        return self.reindex(other.index, fillMethod=fillMethod)
+
     def fill(self, value=None, method='pad'):
         """
         Fill NaN values using the specified method.

pandas/core/tests/test_frame.py

@@ -847,6 +847,12 @@ def test_reindex_int(self):
         smaller = self.intframe.reindex(columns=['A', 'B'])
         self.assert_(smaller['A'].dtype == np.int_)
 
+    def test_reindex_like(self):
+        other = self.frame.reindex(index=self.frame.index[:10],
+                                   columns=['C', 'B'])
+
+        assert_frame_equal(other, self.frame.reindex_like(other))
+
     def test_rename(self):
         mapping = {
             'A' : 'a',

pandas/core/tests/test_series.py

@@ -664,6 +664,11 @@ def test_reindex_bool_pad(self):
         filled_bool = bool_ts.reindex(self.ts.index, fillMethod='pad')
         self.assert_(isnull(filled_bool[:5]).all())
 
+    def test_reindex_like(self):
+        other = self.ts[::2]
+        assert_series_equal(self.ts.reindex(other.index),
+                            self.ts.reindex_like(other))
+
     def test_rename(self):
         renamer = lambda x: x.strftime('%Y%m%d')
         renamed = self.ts.rename(renamer)

pandas/version.py

@@ -1,3 +1,3 @@
 from datetime import datetime
 
-version = '0.3.0.dev20101012'
+version = '0.3.0.dev20101119'

setup.py

@@ -31,6 +31,7 @@
 
 DISTNAME = 'pandas'
 LICENSE = 'BSD'
+AUTHOR = "AQR Capital Management, LLC"
 MAINTAINER = "AQR Capital Management, LLC"
 MAINTAINER_EMAIL = "[email protected]"
 URL = "http://pandas.sourceforge.net"

test.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-#nosetests -w pandas/core --with-coverage --cover-package=pandas.core --pdb-failure
 coverage erase
-nosetests -w pandas/stats --with-coverage --cover-package=pandas.stats
+nosetests -w pandas/core --with-coverage --cover-package=pandas.core --pdb-failure
+# nosetests -w pandas/stats --with-coverage --cover-package=pandas.stats
 # coverage run runtests.py