Merge branch 'issue-022' into 'master'

Change behaviour of detrend process

See merge request postprocessor!17

core/processes/detrend.py

@@ -16,7 +16,7 @@ class detrendParameters(ParametersABC):
         Size of sliding window.
     """
 
-    _defaults = {"window": 45}
+    _defaults = {"window": 16}
 
 
 class detrend(PostProcessABC):
@@ -48,12 +48,10 @@ class detrend(PostProcessABC):
             Detrended time series.
 
         """
-        # Normalise time series: divide by the mean time series
-        signal_norm = signal.div(signal.mean(axis=1), axis=0)
         # Compute moving average
-        signal_movavg = signal_norm.rolling(
+        signal_movavg = signal.rolling(
             window=self.window, center=True, axis=1
         ).mean()
-        # Detrend: divide normalised time series by moving average
-        signal_detrend = signal_norm.div(signal_movavg)
+        # Detrend: subtract normalised time series by moving average
+        signal_detrend = signal.subtract(signal_movavg)
         return signal_detrend.dropna(axis=1)  # Remove columns with NaNs