fix wave_sum

tests/test_wavevstack.py

@@ -3,6 +3,7 @@
 from scipy.signal import butter, lfilter, lfiltic, tf2sos
 
 from waveforms import *
+from waveforms._waveform import wave_sum
 from waveforms.waveform import WaveVStack
 
 
@@ -134,3 +135,9 @@ def test_filters():
     l = wav.tolist()
     wav2 = WaveVStack.fromlist(l)
     assert np.allclose(wav2.sample(), points, atol=1e-6)
+
+
+def test_wave_sum():
+    assert wave_sum([((-1.0, np.inf), (((), ()), ((((), ()), ), (0.02, )))),
+                     ((-1.0, np.inf), (((), ()), ((((), ()), ), (-0.02, ))))
+                     ]) == ((np.inf, ), (((), ()), ))

waveforms/_waveform.pyx

@@ -205,8 +205,8 @@ def wave_sum(waves):
     i = 0
     while i < len(bounds) - 1:
         if seq[i] == seq[i + 1]:
-            del seq[i + 1]
-            del bounds[i + 1]
+            del seq[i]
+            del bounds[i]
         else:
             i += 1
 

waveforms/version.py

@@ -1,2 +1,2 @@
 """Define version number here and read it from setup.py automatically"""
-__version__ = "1.9.0"
+__version__ = "1.9.1"