[add] an exception if unable to find minimum in AIC cf

pylot/core/pick/picker.py

@@ -201,6 +201,9 @@ class AICPicker(AutoPicker):
                 if diffcf[i - 1] >= diffcf[i]:
                     self.Pick = self.Tcf[i]
                     break
+        if self.Pick is None:
+            raise ValueError
+
 
     def calcPick(self):
         """
@@ -221,8 +224,12 @@ class AICPicker(AutoPicker):
             self.prepareCF()
         except ValueError:
             return
+        try:
+            self.findMinimum()
+        except ValueError:
+            print('Could not determine pick on AIC CF')
+            return
 
-        self.findMinimum()
 
         # quality assessment using SNR and slope from CF
         if self.Pick is not None:

pylot/core/pick/utils.py

@@ -1281,13 +1281,12 @@ def smooth_cf(cf, t_smooth, delta):
 
     if len(cf) < ismooth:
         raise ValueError
-
-    for i, val in enumerate(cf):
-        if i <= ismooth:
-            cf_smooth[i] = np.mean(cf[0:i+1])
-        elif i > ismooth:
+    for i in range(1, len(cf)):
+        if i > ismooth:
             ii1 = i - ismooth
             cf_smooth[i] = cf_smooth[i - 1] + (cf[i] - cf[ii1]) / ismooth
+        else:
+            cf_smooth[i] = np.mean(cf[1: i])
     offset = abs(min(cf) - min(cf_smooth))
     cf_smooth -= offset  # remove offset from smoothed function
     return cf_smooth