comparison novelty.py @ 8:a34f9c5d0cd9

remove pyc files tracked by mistake

 	
 	if normalise:
 		novelty = (novelty - np.min(novelty)) / (np.max(novelty) - np.min(novelty))
 	return novelty	
 
+def getNoveltyDiff(novelty, N=1, relative=False):
+	'''Return the second order differece in the novelty curve.'''
+	
+	diff = np.zeros_like(novelty)
+	diff[:-N] = np.diff(novelty, n=N)
+	
+	if relative:
+		diff /= novelty 
+		
+	return diff
+	
 def getDiagonalSlice(ssm, width):
 	''' Return a diagonal stripe of the ssm given its width, with 45 degrees rotation. 
 	Note: requres 45 degrees rotated kernel also.'''
 	w = int(np.floor(width/2.0))
 	length = len(np.diagonal(ssm))