Fixed bug with default parameters NFFT and noverlap ins specgram()

DietBru · DietBru · commit 70551ecb3f9f · 2017-01-16T21:19:53.000+01:00
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -7234,6 +7234,11 @@ def specgram(self, x, NFFT=None, Fs=None, Fc=None, detrend=None,
         Z = np.flipud(Z)
 
         if xextent is None:
+            # define default values:
+            if noverlap is None:
+                noverlap = 128  # defined in mlab.specgram
+            if NFFT is None:
+                NFFT = 256  # defined in mlab._spectral_helper
             # padding is needed for first and last segment:
             pad_xextent = (NFFT-noverlap) / Fs / 2
             xextent = np.min(t) - pad_xextent, np.max(t) + pad_xextent
