wrong instants after segment_time() of UnevenlySignal

[andbiz]

# create a signal

## create fake data
signal_values = np.arange(100)

## create fake indices
idx = np.arange(100)
idx[-1] = 125

## set the sampling frequency
fsamp = 10 # Hz

## set the starting time
tstart = 0 # s

## create an Unevenly signal defining the indices
x_values_idx = idx

s_fake_idx = UnevenlySignal(values = signal_values, sampling_freq = fsamp, signal_nature = 'fake', start_time = tstart,
                       x_values = x_values_idx, x_type = 'indices')

## create an Unevenly signal defining the indices
x_values_time = idx/fsamp + 1

s_fake_time = UnevenlySignal(values = signal_values, sampling_freq = fsamp, signal_nature = 'fake',# start_time = tstart,
                       x_values = x_values_time, x_type = 'instants')

# segmentation of US

s_fake_idx_segment = s_fake_idx.segment_time(4.5, 5)
s_fake_time_segment = s_fake_time.segment_time(4.5, 5)

# plot
ax1 = plt.subplot(211)
s_fake_idx.plot('.-')
s_fake_idx_segment.plot('.-r')

plt.subplot(212, sharex=ax1)
s_fake_time.plot('.-')
s_fake_time_segment.plot('.-r')

[Alebat]

Memo: in UnevenlySignal segmentation increased start_time but not decreased x_values Today: signal has not to be defined between start_time and the first sample