def fit_single_line_BS(self, x, y, zero_lev, err_continuum, fitting_parameters, bootstrap_iterations = 1000):
#Declare parameters and containers for the fit
params_dict = fitting_parameters.valuesdict()
initial_values = [params_dict['A0'], params_dict['mu0'], params_dict['sigma0']]
area_array = empty(bootstrap_iterations)
params_array = empty([3, bootstrap_iterations])
n_points = len(x)
#Perform the fit
for i in range(bootstrap_iterations):
y_new = y + np_normal_dist(0, err_continuum, n_points)
area_array[i] = simps(y_new, x) - simps(zero_lev, x)
best_vals, covar = curve_fit(gaussian_curveBS, (x, zero_lev), y_new, p0=initial_values, maxfev = 1600)
params_array[:,i] = best_vals
#Compute Bootstrap output
mean_area, std_area = mean(area_array), std(area_array)
mean_params_array, stdev_params_array = params_array.mean(1), params_array.std(1)
#Store the data
self.fit_dict['area_intg'], self.fit_dict['area_intg_er'] = mean_area, std_area
self.fit_dict['A0_norm'], self.fit_dict['A0_norm_er'] = mean_params_array[0], stdev_params_array[0]
self.fit_dict['mu0_norm'], self.fit_dict['mu0_norm_er'] = mean_params_array[1], stdev_params_array[1]
self.fit_dict['sigma0_norm'], self.fit_dict['sigma0_norm_er'] = mean_params_array[2], stdev_params_array[2]
A = ufloat(mean_params_array[0], stdev_params_array[0])
sigma = ufloat(mean_params_array[2], stdev_params_array[2])
fwhm0_norm = 2.354820045 * sigma
areaG0_norm = A * sigma * self.sqrt2pi
self.fit_dict['fwhm0_norm'], self.fit_dict['fwhm0_norm_er'] = fwhm0_norm.nominal_value, fwhm0_norm.std_dev
self.fit_dict['area_G0_norm'], self.fit_dict['area_G0_norm_er'] = areaG0_norm.nominal_value, areaG0_norm.std_dev
return
def fit_single_line(self, x, y, zero_lev, err_continuum, fitting_parameters, bootstrap_iterations = 1000):
#Simple fit
if self.fit_dict['MC_iterations'] == 1:
fit_output = lmfit_minimize(residual_gauss, fitting_parameters, args=(x, y, zero_lev, err_continuum))
self.fit_dict['area_intg'] = simps(y, x) - simps(zero_lev, x)
self.fit_dict['area_intg_err'] = 0.0
#Bootstrap
else:
mini_posterior = Minimizer(lnprob_gaussCurve, fitting_parameters, fcn_args = ([x, y, zero_lev, err_continuum]))
fit_output = mini_posterior.emcee(steps=200, params = fitting_parameters)
#Bootstrap for the area of the lines
area_array = empty(bootstrap_iterations)
len_x_array = len(x)
for i in range(bootstrap_iterations):
y_new = y + np_normal_dist(0.0, err_continuum, len_x_array)
area_array[i] = simps(y_new, x) - simps(zero_lev, x)
self.fit_dict['area_intg'] = mean(area_array)
self.fit_dict['area_intg_err'] = std(area_array)
#Store the fitting parameters
output_params = fit_output.params
for key in self.fit_dict['parameters_list']:
self.fit_dict[key + '_norm'] = output_params[key].value
self.fit_dict[key + '_norm_er'] = output_params[key].stderr
return
def fit_blended_line_BS_lmfit(self, x, y, zero_lev, err_continuum, Ncomps, fitting_parameters, add_wide_component, fitting_parameters_wide, bootstrap_iterations = 500, MC_iterations = 200):
#Prepare some data in advance
n_points = len(x)
n_parameters = len(self.fit_dict['parameters_list'])
params_list = self.fit_dict['parameters_list']
range_param = range(n_parameters)
range_boots = range(bootstrap_iterations)
area_array = empty(bootstrap_iterations)
idcs_components = map(str, range(Ncomps))
params_matrix = empty((n_parameters, bootstrap_iterations))
errors_matrix = empty((n_parameters, bootstrap_iterations))
Ncomps_wide = ['3']
#Loop through the iterations:
for i in range_boots:
y_new = y + np_normal_dist(0.0, err_continuum, n_points)
area_array[i] = simps(y_new, x) - simps(zero_lev, x)
fit_Output = lmfit_minimize(residual_gaussMix, fitting_parameters, args=(x, y_new, zero_lev, err_continuum, idcs_components))
output_params = fit_Output.params
#Case with a wide component
if add_wide_component:
#Only works for Halpha
sigma_limit = output_params['sigma1'].value
limit_0, limit_1 = 6548.05 - self.fit_dict['x_scaler'] - sigma_limit * 1.5, 6548.05 - self.fit_dict['x_scaler'] + sigma_limit * 1.5
limit_2, limit_3 = 0 - sigma_limit * 4, 0 + sigma_limit * 4
limit_4, limit_5 = 6583.46 - self.fit_dict['x_scaler'] - sigma_limit * 3, 6583.46 - self.fit_dict['x_scaler'] + sigma_limit * 3
indeces = ((x >= limit_0) & (x <= limit_1)) + ((x >= limit_2) & (x <= limit_3)) + ((x >= limit_4) & (x <= limit_5))
mask = invert(indeces)
x_wide, y_wide, zero_wide = x[mask], y[mask], zero_lev[mask]
#Fit the wide component without narrow component
fit_output_wide = lmfit_minimize(residual_gaussMix, fitting_parameters_wide, args=(x_wide, y_wide, zero_wide, err_continuum, Ncomps_wide))
output_params_wide = fit_output_wide.params
#Get wide curve
y_wide = gaussian_mixture(output_params_wide.valuesdict(), x, zero_lev, Ncomps_wide)
#Calculate emission line region again
y_pure_narrow = y - y_wide + zero_lev
#Fit narrow components again
fit_Output = lmfit_minimize(residual_gaussMix, fitting_parameters, args=(x, y_pure_narrow, zero_lev, err_continuum, idcs_components))
out_params_narrow = fit_Output.params
#Combine the results from both fits
output_params = out_params_narrow + output_params_wide
#save parameters to array
for j in range_param:
params_matrix[j,i] = output_params[params_list[j]].value
errors_matrix[j,i] = output_params[params_list[j]].stderr
#Calculate mean and std deviation values
mean_area, std_area = mean(area_array), std(area_array)
mean_params_array, stdev_params_array = params_matrix.mean(1), params_matrix.std(1)
errorsmean_array = errors_matrix.mean(1)
#Return the data to a dictionary format
self.fit_dict['area_intg'], self.fit_dict['area_intg_er'] = mean_area, std_area
for j in range(len(self.fit_dict['parameters_list'])):
param = self.fit_dict['parameters_list'][j]
self.fit_dict[param+'_norm'] = mean_params_array[j]
self.fit_dict[param+'_norm_er'] = errorsmean_array[j]
#Increase the number of components if wide observed
self.fit_dict.line_number = self.fit_dict.line_number + 1 if add_wide_component else self.fit_dict.line_number
return
def fit_blended_line_BS(self, x, y, zero_lev, err_continuum, Ncomps, fitting_parameters, add_wide_component, fitting_parameters_wide, bootstrap_iterations = 1000, MC_iterations = 200):
#Declare parameters and containers for the fit
params_dict = fitting_parameters.valuesdict()
n_points = len(x)
list_parameters = []
initial_val = empty(3 * Ncomps)
area_array = empty(bootstrap_iterations)
params_array = empty([3 * Ncomps, bootstrap_iterations])
# if add_wide_component:
# x_scaler = self.fit_dict['x_scaler']
# need_to_extract = coso
#Reshape parameters from dict to array (A0, mu0, sigma0, A1, mu1, sigma1...)
for i in range(Ncomps):
comp = str(i)
line_param = [param.format(str(comp)) for param in ['A{}', 'mu{}', 'sigma{}']]
initial_val[i*3:(i+1)*3] = params_dict[line_param[0]], params_dict[line_param[1]], params_dict[line_param[2]]
list_parameters += line_param
#Perform the fit
for j in range(bootstrap_iterations):
y_new = y + np_normal_dist(0, err_continuum, n_points)
area_array[j] = simps(y_new, x) - simps(zero_lev, x)
best_vals, covar = curve_fit(gaussian_MixBS, (x, zero_lev, Ncomps), y_new, p0=initial_val) # Need to poot here the new function
params_array[:,j] = best_vals
# if add_wide_component:
# sigma_limit = best_vals[5]
# limit_0, limit_1 = 6548.05 - x_scaler - sigma_limit * 1.5, 6548.05 - x_scaler + sigma_limit * 1.5
# limit_2, limit_3 = 0 - sigma_limit * 4, 0 + sigma_limit * 4
# limit_4, limit_5 = 6583.46 - x_scaler - sigma_limit * 3, 6583.46 - x_scaler + sigma_limit * 3
#
# indeces = ((x >= limit_0) & (x <= limit_1)) + ((x >= limit_2) & (x <= limit_3)) + ((x >= limit_4) & (x <= limit_5))
# mask = invert(indeces)
# x_wide, y_wide, zero_wide = x[mask], y_new[mask], zero_lev[mask]
#
# best_vals_wide, covar = curve_fit(gaussian_curveBS, (x_wide, zero_wide), y_wide, p0=initial_wide_values)
#
# #Calculate wide component curve
# y_wide_fit = gaussian_curveBS((x, zero_lev), *best_vals_wide)
#
# #Calculate emission line region again
# y_pure_narrow = y_new - y_wide_fit + zero_lev
#
# #Recalculate the narrow components
# best_vals = curve_fit(gaussian_MixBS, (x, zero_lev, Ncomps), y_pure_narrow, p0=initial_val)
#
# if add_wide_component:
# self.fit_dict.line_number = self.fit_dict.line_number + 1
# concantenate Matrix
#Compute Bootstrap output
mean_area, std_area = mean(area_array), std(area_array)
mean_params_array, stdev_params_array = params_array.mean(1), params_array.std(1)
#Store the data
self.fit_dict[['area_intg', 'area_intg_er']] = mean_area, std_area
#Return to a dictionary format
for m in range(Ncomps):
comp = str(m)
line_param = [param.format(str(comp)) for param in ['A{}_norm', 'mu{}_norm', 'sigma{}_norm']]
line_param_er = [param.format(str(comp)) for param in ['A{}_norm_er', 'mu{}_norm_er', 'sigma{}_norm_er']]
for n in range(len(line_param)):
self.fit_dict[line_param[n]] = mean_params_array[m*3:(m+1)*3][n]
self.fit_dict[line_param_er[n]] = stdev_params_array[m*3:(m+1)*3][n]
#Calculate the gaussian area
A_keys, Aerr_keys = ['A{}_norm'.format(str(i)) for i in range(Ncomps)], ['A{}_norm_er'.format(str(i)) for i in range(Ncomps)]
sigma_keys, sigmaerr_keys = ['sigma{}_norm'.format(str(i)) for i in range(Ncomps)], ['sigma{}_norm_er'.format(str(i)) for i in range(Ncomps)]
A_vector = unumpy.uarray(self.fit_dict[A_keys].values, self.fit_dict[Aerr_keys].values)
sigma_vector = unumpy.uarray(self.fit_dict[sigma_keys].values, self.fit_dict[sigmaerr_keys].values)
fwhm_vector = 2.354820045 * sigma_vector
areaG_vector = A_vector * sigma_vector * self.sqrt2pi
#Add areas to dict
fwhm_keys, fwhmerr_keys = ['fwhm{}'.format(str(i)) for i in range(Ncomps)], ['fwhm{}_er'.format(str(i)) for i in range(Ncomps)]
AreaG_keys, AreaGerr_keys = ['area_G{}_norm'.format(str(i)) for i in range(Ncomps)], ['area_G{}_norm_er'.format(str(i)) for i in range(Ncomps)]
fwhm_nominal, fwhm_std_dev = unumpy.nominal_values(fwhm_vector), unumpy.std_devs(fwhm_vector)
AreaG_nominal, AreaG_std_dev = unumpy.nominal_values(areaG_vector), unumpy.std_devs(areaG_vector)
for m in range(len(AreaG_keys)):
self.fit_dict[fwhm_keys[m]] = fwhm_nominal[m]
self.fit_dict[fwhmerr_keys[m]] = fwhm_std_dev[m]
self.fit_dict[AreaG_keys[m]] = AreaG_nominal[m]
self.fit_dict[AreaGerr_keys[m]] = AreaG_std_dev[m]
return
def fit_blended_line_emcee(self, x, y, zero_lev, err_continuum, Ncomps, fitting_parameters, add_wide_component, fitting_parameters_wide, bootstrap_iterations = 1000, MC_iterations = 200):
#---First we integrate the brute area with all the components
if self.fit_dict['MC_iterations'] == 1:
self.fit_dict['area_intg'] = simps(y, x) - simps(zero_lev, x)
self.fit_dict['area_intg_err'] = 0.0
else:
area_array = empty(bootstrap_iterations)
len_x_array = len(x)
for i in range(bootstrap_iterations):
y_new = y + np_normal_dist(0.0, err_continuum, len_x_array)
area_array[i] = simps(y_new, x) - simps(zero_lev, x)
self.fit_dict['area_intg'] = mean(area_array)
self.fit_dict['area_intg_err'] = std(area_array)
#---Second we proceed to analyze as gaussian components
idcs_components = map(str, range(Ncomps))
mini_posterior = Minimizer(lnprob_gaussMix, fitting_parameters, fcn_args = ([x, y, zero_lev, err_continuum, idcs_components]), method='powell')
fit_output = mini_posterior.emcee(steps=MC_iterations, params = fitting_parameters)
output_params = fit_output.params
if add_wide_component: #This currently only valid for Halpha
sigma_limit = output_params['sigma1'].value
limit_0, limit_1 = 6548.05 - self.fit_dict['x_scaler'] - sigma_limit * 1.5, 6548.05 - self.fit_dict['x_scaler'] + sigma_limit * 1.5
limit_2, limit_3 = 0 - sigma_limit * 4, 0 + sigma_limit * 4
limit_4, limit_5 = 6583.46 - self.fit_dict['x_scaler'] - sigma_limit * 3, 6583.46 - self.fit_dict['x_scaler'] + sigma_limit * 3
#Get the wide component area
indeces = ((x >= limit_0) & (x <= limit_1)) + ((x >= limit_2) & (x <= limit_3)) + ((x >= limit_4) & (x <= limit_5))
mask = invert(indeces)
x_wide, y_wide, zero_wide = x[mask], y[mask], zero_lev[mask]
Ncomps_wide = ['3']
#Fit the wide component without narrow component
mini_posterior_wide = Minimizer(lnprob_gaussMix, fitting_parameters_wide, fcn_args = ([x_wide, y_wide, zero_wide, err_continuum, Ncomps_wide]), method='powell')
fit_output_wide = mini_posterior_wide.emcee(steps=MC_iterations, params = fitting_parameters_wide)
output_params_wide = fit_output_wide.params
#Calculate wide component curve
y_wide_fit = gaussian_mixture(output_params_wide.valuesdict(), x, zero_lev, Ncomps_wide)
#Calculate emission line region again
y_pure_narrow = y - y_wide_fit + zero_lev
#Fit narrow components again
mini_posterior = Minimizer(lnprob_gaussMix, fitting_parameters, fcn_args = ([x, y_pure_narrow, zero_lev, err_continuum, idcs_components]), method='powell')
fit_output_narrow = mini_posterior.emcee(steps=MC_iterations, params=fitting_parameters)
output_params_narrow = fit_output_narrow.params
#Combine the results from both fits
output_params = output_params_narrow + output_params_wide
#Add the wide component to the fit we are performing
self.fit_dict.line_number = self.fit_dict.line_number + 1
for key in self.fit_dict['parameters_list']:
self.fit_dict[key + '_norm'] = output_params[key].value if output_params[key].value is not None else np_nan
self.fit_dict[key + '_norm_er'] = output_params[key].stderr if output_params[key].stderr is not None else np_nan
return
