adding drive energy

rowers/dataprep.py

@@ -2332,8 +2332,16 @@ def workout_normv(w,pp=4.0):
     v4mean = wavg(df,'v4','deltat')
     normv = v4mean**(1./pp)
 
-    if np.isnan(normv):
-        return 500./120.
-
-    return normv
+    df['w4'] = df['driveenergy']**(pp)
+    w4mean = wavg(df,'w4','deltat')
+    normw = w4mean**(1./pp)
+    
+
+    if np.isnan(normv):
+        normv =  500./120.
+
+    if np.isnan(normw):
+        normw = 0
+
+    return normv,normw