57 lines
1.2 KiB
Python
57 lines
1.2 KiB
Python
import numpy as np
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from astropy.modeling import models, fitting
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from .utils import get_hist
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def fit_line(model, x, y):
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"""
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Line fitting kx+b
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Parameters
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----------
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model : astropy.modeling.Model
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fit model
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x : array
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x data, can have two columns representing two independent variables
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y : array
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y data
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Returns
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-------
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fitted_model : astropy fitting model
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fitting gaussian model
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"""
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fitter = fitting.LevMarLSQFitter()
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if np.ndim(x) == 1:
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fitted_model = fitter(model, x, y)
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else:
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fitted_model = fitter(model, x[:, 0], x[:, 1], y)
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return fitted_model
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def fit_hist_gaussian(x, step=1):
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"""
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Gaussian fitting is performed on the histogram
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Parameters
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----------
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x : array
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data point
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step : int, optional
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Minimum bin width. The bin width is an integer multiple of step.
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Returns
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-------
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fitted_model : astropy fitting model
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fitting gaussian model
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"""
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fitter = fitting.LMLSQFitter()
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count, center = get_hist(x, step=step)
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model = models.Gaussian1D(amplitude=count.max(), mean=x.mean(), stddev=x.std())
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fitted_model = fitter(model, center, count)
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return fitted_model
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