show_spectrum.py
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#! /usr/bin/env python
# ==========================================================================
# Display spectrum generated by csspec
#
# Copyright (C) 2015-2017 Juergen Knoedlseder
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# ==========================================================================
import sys
import gammalib
import cscripts
try:
import matplotlib.pyplot as plt
plt.figure()
plt.close()
except (ImportError, RuntimeError):
print('This script needs the "matplotlib" module')
sys.exit()
# ============= #
# Plot spectrum #
# ============= #
def plot_spectrum(filename, plotfile):
"""
Plot spectrum
Parameters
----------
filename : str
Name of spectrum FITS file
plotfile : str
Plot file name
"""
# Read spectrum file
fits = gammalib.GFits(filename)
table = fits.table(1)
c_energy = table['Energy']
c_ed = table['ed_Energy']
c_eu = table['eu_Energy']
c_flux = table['Flux']
c_eflux = table['e_Flux']
c_ts = table['TS']
c_upper = table['UpperLimit']
# Initialise arrays to be filled
energies = []
flux = []
ed_engs = []
eu_engs = []
e_flux = []
ul_energies = []
ul_ed_engs = []
ul_eu_engs = []
ul_flux = []
# Loop over rows of the file
nrows = table.nrows()
for row in range(nrows):
# Get Test Statistic, flux and flux error
ts = c_ts.real(row)
flx = c_flux.real(row)
e_flx = c_eflux.real(row)
# If Test Statistic is larger than 9 and flux error is smaller than
# flux then append flux plots ...
if ts > 9.0 and e_flx < flx:
energies.append(c_energy.real(row))
flux.append(c_flux.real(row))
ed_engs.append(c_ed.real(row))
eu_engs.append(c_eu.real(row))
e_flux.append(c_eflux.real(row))
# ... otherwise append upper limit
else:
ul_energies.append(c_energy.real(row))
ul_flux.append(c_upper.real(row))
ul_ed_engs.append(c_ed.real(row))
ul_eu_engs.append(c_eu.real(row))
# Set upper limit errors
yerr = [0.6 * x for x in ul_flux]
# Plot the spectrum
plt.figure()
plt.loglog()
plt.grid()
plt.errorbar(energies, flux, yerr=e_flux, xerr=[ed_engs, eu_engs],
fmt='ro')
plt.errorbar(ul_energies, ul_flux, xerr=[ul_ed_engs, ul_eu_engs],
yerr=yerr, uplims=True, fmt='ro')
plt.xlabel('Energy (TeV)')
plt.ylabel(r'E $\times$ dN/dE (erg cm$^{-2}$ s$^{-1}$)')
# Show figure
if len(plotfile) > 0:
plt.savefig(plotfile)
else:
plt.show()
# Return
return
# ============= #
# Show spectrum #
# ============= #
def show_spectrum():
"""
Show spectrum
"""
# Set usage string
usage = 'show_spectrum.py [-p plotfile] [file]'
# Set default options
options = [{'option': '-p', 'value': ''}]
# Get arguments and options from command line arguments
args, options = cscripts.ioutils.get_args_options(options, usage)
# Extract script parameters from options
plotfile = options[0]['value']
# Show spectrum
plot_spectrum(args[0], plotfile)
# Return
return
# ======================== #
# Main routine entry point #
# ======================== #
if __name__ == '__main__':
# Show spectrum
show_spectrum()