Bug in sweep generator

[asceenl]

When changing the sweep period, we get the following error:

Traceback (most recent call last):
File "/usr/lib/python3.6/site-packages/sounddevice.py", line 733, in callback_ptr
return _wrap_callback(callback, data, frames, time, status)
File "/usr/lib/python3.6/site-packages/sounddevice.py", line 2508, in _wrap_callback
callback(*args)
File "./friture/generator.py", line 251, in audio_callback
floatdata = generator.signal(t)
File "./friture/generators/sweep.py", line 108, in signal
result[firstmaxpos:] = np.cos(self.K * (np.exp((t[firstmaxpos:] - self.timeoffset) % self.T / self.L) - 1.))
TypeError: only integer scalar arrays can be converted to a scalar index

It turns out that the firstmaxpos from np.argwhere needs to be indexed one more to find the right value:
Line 101 of sweep.py:
firstmaxpos = np.argwhere(maxdetection != 0.)[0][0] + 1
instead of
firstmaxpos = np.argwhere(maxdetection != 0.)[0] + 1

[tlecomte]

This has now been released as part of Friture 0.34:
https://github.com/tlecomte/friture/releases/tag/v0.34.1

Thank you very much for this contribution! I'm now closing the issue.