show_model.py
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#! /usr/bin/env python
# ==========================================================================
# This script shows a model
#
# Copyright (C) 2015 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 gammalib
import sys
import math
try:
import matplotlib.pyplot as plt
except:
sys.exit("This script needs matplotlib")
# ======================= #
# Plot spectral component #
# ======================= #
def plot_spectrum(model, emin=0.01, emax=100.0, enumbins=100):
"""
"""
# Get spectral component
spectrum = model.spectral()
# Setup energy axis
e_min = gammalib.GEnergy(emin, "TeV")
e_max = gammalib.GEnergy(emax, "TeV")
ebounds = gammalib.GEbounds(enumbins, e_min, e_max)
# Setup model plot
x = []
y = []
min = 1.0e30
max = 0.0
for i in range(enumbins):
energy = ebounds.elogmean(i)
value = spectrum.eval(energy, gammalib.GTime())
if value > max:
max = value
if value < min:
min = value
x.append(energy.TeV())
y.append(value)
# Set minimum and maximum
max = math.pow(10.0, math.log10(max)+1)
if min < 0.0001*max:
min = 0.0001*max
min = math.pow(10.0, math.log10(min)-1)
# Show spectrum
plt.figure()
plt.title(model.name()+" ("+spectrum.type()+")")
plt.loglog()
plt.grid()
plt.loglog(x, y, color='red')
plt.xlabel("Energy [TeV]")
plt.ylabel(r"dN/dE [ph s$^{-1}$ cm$^{-2}$ MeV$^{-1}$]")
plt.ylim([min,max])
plt.show()
# Return
return
# ============= #
# Script entry #
# ============= #
if __name__ == "__main__":
"""
"""
# Check for model filename
if len(sys.argv) < 2:
sys.exit("Usage: show_model.py model.xml [index]")
# Get optional model index
if len(sys.argv) == 3:
index = int(sys.argv[2])
else:
index = 0
# Read models XML file
filename = sys.argv[1]
models = gammalib.GModels(filename)
# Extract relevant model
model = models[index]
# Plot spectrum
plot_spectrum(model)