lumispy.utils.signals module

lumispy.utils.signals.com(spectrum_intensities, signal_axis, **kwargs)

Finds the centroid (center of mass) of a peak in the spectrum based from the intensity at each pixel value and its respective signal axis.

Parameters:

  • spectrum_intensities (array) – An array with the intensities of the spectrum.

  • signal_axis (hyperspy.axes.BaseDataAxis subclass) – A HyperSpy signal axis class containing an array with the wavelength/ energy for each intensity/signal value.

  • kwargs (dictionary) – For the scipy.interpolate.interp1d function.

Returns:

center_of_mass – The centroid of the spectrum.

Return type:

float

Examples

# Assume we have a spectrum with wavelengths and intensities >>> wavelengths = [200, 300, 400, 500, 600, 700] >>> intensities = [1, 2, 3, 2, 1, 0] >>> from hyperspy.axes import DataAxis >>> signal_axis = DataAxis(axis=wavelengths)

>>> center_of_mass = com(intensities, signal_axis)
>>> print(center_of_mass)  # Outputs: [400.0]