PiecewiseConstant

class iqm.pulse.playlist.waveforms.PiecewiseConstant(n_samples, changepoints, values)

Bases: Waveform

Piecewise constant waveform.

The values are assumed to be in the range \([-1, 1]\), and the changepoints are assumed to be in the Nyquist-zone of the duration, i.e. in the range [-duration/2, duration/2]

Parameters:

• changepoints (ndarray) – Array of the changepoints of the piecewise constant function.

• values (ndarray) – Array of the values of the piecewise constant function.

• changepoints. (Must have one more element than)

• n_samples (int)

Module: iqm.pulse.playlist.waveforms

Attributes

changepoints
values
n_samples	Requested number of samples for the waveform.

Methods

non_timelike_attributes

Mapping from waveform attributes to the units of their calibration data, unless that unit is second.

static non_timelike_attributes()

Mapping from waveform attributes to the units of their calibration data, unless that unit is second.

Used to construct the parameters for the calibration data required by the waveform. By default all the waveform attributes are “timelike” (the unit for their calibration data is s). However, some waveform attributes can be dimensionless, e.g. the relative amplitudes in a sum of consisting of multiple terms, or frequency-like (calibration data has the unit ‘Hz’). If a Waveform subclass has non-timelike attributes, it needs to redefine this method.

When the Waveform is constructed, all timelike calibration data is converted to units of the sampling window duration, and all frequency-like calibration data into units of inverse sampling window duration.

Return type:

dict[str, str]

_sample(sample_coords)

Actually samples the waveform.

Parameters:

sample_coords (ndarray) – coordinates of the samples to be returned

Returns:

array of samples (same shape as sample_coords, dtype == float)

Return type:

ndarray