adc (inplace=False, expanded=False): refactor for clarity.

Author: Benjamin Moody

wfdb/io/_signal.py

@@ -581,13 +581,12 @@ def adc(self, expanded=False, inplace=False):
                     d_signal.append(ch_d_signal)
 
             else:
-                nanlocs = np.isnan(self.p_signal)
-                # Cannot cast dtype to int now because gain is float.
-                d_signal = self.p_signal.copy()
-                np.multiply(d_signal, self.adc_gain, d_signal)
-                np.add(d_signal, self.baseline, d_signal)
-                np.round(d_signal, 0, d_signal)
-                d_signal = d_signal.astype(intdtype, copy=False)
+                p_signal = self.p_signal.copy()
+                nanlocs = np.isnan(p_signal)
+                np.multiply(p_signal, self.adc_gain, p_signal)
+                np.add(p_signal, self.baseline, p_signal)
+                np.round(p_signal, 0, p_signal)
+                d_signal = p_signal.astype(intdtype, copy=False)
 
                 if nanlocs.any():
                     for ch in range(d_signal.shape[1]):