cta_make_nodes.py
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#! /usr/bin/env python
# ==========================================================================
# This Python script creates the node section of the NodeFunction using
# logarithmically spaced energy bins. The intensity scale is set to the
# HESS Crab intensity (assuming a power law).
#
# Copyright (C) 2012 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/>.
#
# ==========================================================================
from gammalib import *
import sys
import math
# ============== #
# Write one node #
# ============== #
def write_node(file, energy, scale):
"""
Writes one node to XML file.
"""
# Convert to strings
str_energy = str(energy)
str_scale = str(scale)
# Write start tag
file.write(' <node>\n')
# Write energy
file.write(' <parameter scale="1e6" name="Energy"')
file.write(' min="'+str_energy+'" max="'+str_energy+'"')
file.write(' value="'+str_energy+'"')
file.write(' free="0"/>\n')
# Write intensity
file.write(' <parameter scale="'+str_scale+'" name="Intensity"')
file.write(' min="1e-5" max="1e5"')
file.write(' value="1.0"')
file.write(' free="1"/>\n')
# Write end tag
file.write(' </node>\n')
# Return
return
# ============ #
# Create nodes #
# ============ #
def create_nodes(emin, emax, enumbins):
"""
Create nodes (energies in TeV).
"""
# Open file
file = open("nodes.xml", "w")
# Set node boundaries
elogmin = math.log10(float(emin))
elogmax = math.log10(float(emax))
elogbin = (elogmax - elogmin)/(float(enumbins)-1.0)
# Fill arrays
for i in range(int(enumbins)):
# Compute energy
energy = math.pow(10.0, i*elogbin+elogmin)
# Compute scale (HESS Crab spectrum)
scale = 3.45e-17 * math.pow(energy, -2.63)
# Write node
write_node(file, energy, scale)
# Debug
#sys.stdout.write(energy)
#sys.stdout.write(math.pow(10.0, int(math.log10(scale))-1.0)±"\n")
# Close file
file.close()
# Return
return
# ======================= #
# Main script entry point #
# ======================= #
if __name__ == '__main__':
"""
Compute nodes.
"""
# Check command line
usage = "Usage: cta_make_nodes emin emax enumbins"
if len(sys.argv) < 3:
sys.stdout.write(usage+"\n")
sys.exit()
# Extract parameters
emin = sys.argv[1]
emax = sys.argv[2]
enumbins = sys.argv[3]
# Create nodes
create_nodes(emin, emax, enumbins)