DOC: Update return value units in specgram

gitj · gitj · commit 930a9dbd9136 · 2012-11-13T14:59:47.000-05:00
diff --git a/lib/matplotlib/axes.py b/lib/matplotlib/axes.py
@@ -8617,6 +8617,9 @@ def specgram(self, x, NFFT=256, Fs=2, Fc=0, detrend=mlab.detrend_none,
         spectrum is shown.  If *x* is complex, both positive and
         negative parts of the spectrum are shown.  This can be
         overridden using the *sides* keyword argument.
+        
+        Also note that while the plot is in dB, the *Pxx* array returned is
+        linear in power.
 
         **Example:**
 
