show_pha.py
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#! /usr/bin/env python
# ==========================================================================
# Show a spectrum in PHA format.
#
# Copyright (C) 2013-2016 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 math
import gammalib
try:
import matplotlib.pyplot as plt
plt.figure()
plt.close()
except:
print('This script needs the "matplotlib" module')
sys.exit()
# ================= #
# Show PHA spectrum #
# ================= #
def show_pha(pha, plotfile=''):
"""
Show PHA spectrum
Parameters
----------
spectrum : `~gammalib.GPha`
PHA file
plotfile : str, optional
Plot file name
"""
# Create figure
plt.figure(1)
plt.title('PHA spectrum (' + pha.filename() + ')')
# Generate energy vector
energy = []
channels = False
if pha.ebounds().size() > 0:
for i in range(pha.ebounds().size()):
energy.append(pha.ebounds().elogmean(i).TeV())
else:
for i in range(pha.size()):
energy.append(float(i+1))
channels = True
# Generate data and error vector
counts = [0.0 for i in range(pha.size())]
for i in range(pha.size()):
counts[i] = pha[i]
error = [math.sqrt(c) for c in counts]
# Plot data
if channels:
plt.semilogy(energy, counts, 'ro')
else:
plt.loglog(energy, counts, 'ro')
plt.errorbar(energy, counts, error, fmt='ro', ecolor='r')
# Set axes
if channels:
plt.xlabel('Channels')
else:
plt.xlabel('Energy (TeV)')
plt.ylabel('Counts')
# Show spectrum or save it into file
if len(plotfile) > 0:
plt.savefig(plotfile)
else:
plt.show()
# Return
return
# ======================== #
# Main routine entry point #
# ======================== #
if __name__ == '__main__':
# Print usage information
usage = 'Usage: show_pha filename [file]'
if len(sys.argv) < 2:
print(usage)
sys.exit()
# Check if plotting in file is requested
plotfile = ''
if len(sys.argv) == 3:
plotfile = sys.argv[2]
# Extract parameters
filename = sys.argv[1]
# Load PHA spectrum
pha = gammalib.GPha(filename)
# Show PHA spectrum
show_pha(pha, plotfile=plotfile)