Update CHANGELOG and api_changes for the changes to psd and friends.

dopplershift · dopplershift · commit 3e70c4c46d9c · 2008-12-08T21:23:04.000Z
svn path=/trunk/matplotlib/; revision=6520
diff --git a/CHANGELOG b/CHANGELOG
@@ -1,3 +1,8 @@
+2008-12-08 Updated spectral methods (psd, csd, etc.) to scale one-sided
+           densities by a factor of 2 and, optionally, scale all densities
+           by the sampling frequency.  This gives better MatLab
+           compatibility. -RM
+
 2008-12-08 Fixed alignment of ticks in colorbars. -MGD
 
 2008-12-07 drop the deprecated "new" keyword of np.histogram() for
diff --git a/doc/api/api_changes.rst b/doc/api/api_changes.rst
@@ -9,6 +9,15 @@ list may help describe what changes may be necessary in your code.
 Changes for 0.98.x
 ==================
 
+* Modified :func:`matplotlib.mlab.psd`, :func:`matplotlib.mlab.csd`,
+  :func:`matplotlib.mlab.cohere`, and :func:`matplotlib.mlab.specgram`
+  to scale one-sided densities by a factor of 2.  Also, optionally
+  scale the densities by the sampling frequency, which gives true values
+  of densities that can be integrated by the returned frequency values.
+  This also gives better MatLab compatibility.  The corresponding
+  :class:`matplotlib.axes.Axes` methods and :mod:`matplotlib.pyplot`
+  functions were updated as well.
+
 * Font lookup now uses a nearest-neighbor approach rather than an
   exact match.  Some fonts may be different in plots, but should be
   closer to what was requested.
