# AngleCalCXFitter¶

class AngleCalCXFitter(backend_result, xdata, qubits, fit_p0, fit_bounds)[source]

Bases: qiskit.ignis.characterization.fitters.BaseGateFitter

Amplitude error fitter

See BaseFitter __init__

Methods

 add_data Add new execution results to previous execution results angle_err Return the gate angle error fit_data Fit the curve. plot Plot err data.

Attributes

backend_result

Return the execution results

Return type

Union[Result, List[Result]]

description

Return the fitter’s purpose, e.g. ‘T1’

Return type

str

fit_fun

Return the function used in the fit, e.g. BaseFitter._exp_fit_fun

Return type

Callable

measured_qubits

Return the indices of the qubits to be characterized

Return type

List[int]

params

Return the fit function parameters that were calculated by curve_fit

Return type

List[float]

params_err

Return the error of the fit function parameters

Return type

List[float]

series

Return the list of series for the data

Return type

Optional[List[str]]

xdata

Return the data points on the x-axis, the independenet parameter which is fit against

Return type

Union[List[float], array]

ydata

Return the data points on the y-axis

The data points are returning in the form of a list of dictionaries:

• ydata[i][‘mean’] is a list, where item

no. j is the probability of success of qubit i for a circuit that lasts xdata[j].

• ydata[i][‘std’] is a list, where ydata[‘std’][j] is the

standard deviation of the success of qubit i.

Return type

List[Dict]