#!/usr/bin/env python

# <examples/doc_builtinmodels_peakmodels.py>
import matplotlib.pyplot as plt
from numpy import loadtxt

from lmfit.models import GaussianModel, LorentzianModel, VoigtModel

data = loadtxt('test_peak.dat')
x = data[:, 0]
y = data[:, 1]

gamma_free = False

MODEL = 'gauss'
# MODEL = 'loren'
# MODEL = 'voigt'
# gamma_free = True

if MODEL.lower().startswith('g'):
    mod = GaussianModel()
    gamma_free = False
    figname = '../doc/_images/models_peak1.png'
elif MODEL.lower().startswith('l'):
    mod = LorentzianModel()
    gamma_free = False
    figname = '../doc/_images/models_peak2.png'
elif MODEL.lower().startswith('v'):
    mod = VoigtModel()
    figname = '../doc/_images/models_peak3.png'

pars = mod.guess(y, x=x)

if gamma_free:
    pars['gamma'].set(value=0.7, vary=True, expr='')
    figname = '../doc/_images/models_peak4.png'

out = mod.fit(y, pars, x=x)
print(out.fit_report(min_correl=0.25))

plt.plot(x, y, 'b-')
plt.plot(x, out.best_fit, 'r-')
# plt.savefig(figname)
plt.show()
# <end examples/doc_builtinmodels_peakmodels.py>