Commit a6dd93fdac084eed879b9803b50552ff6ec09da1
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7a8e2181
Add PHA spectrum display script.
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examples/show_pha.py
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| 1 | +#! /usr/bin/env python | ||
| 2 | +# ========================================================================== | ||
| 3 | +# This script displays a spectrum in PHA format. | ||
| 4 | +# | ||
| 5 | +# Required 3rd party modules: | ||
| 6 | +# - matplotlib | ||
| 7 | +# - numpy | ||
| 8 | +# | ||
| 9 | +# Copyright (C) 2013 Juergen Knoedlseder | ||
| 10 | +# | ||
| 11 | +# This program is free software: you can redistribute it and/or modify | ||
| 12 | +# it under the terms of the GNU General Public License as published by | ||
| 13 | +# the Free Software Foundation, either version 3 of the License, or | ||
| 14 | +# (at your option) any later version. | ||
| 15 | +# | ||
| 16 | +# This program is distributed in the hope that it will be useful, | ||
| 17 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 18 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 19 | +# GNU General Public License for more details. | ||
| 20 | +# | ||
| 21 | +# You should have received a copy of the GNU General Public License | ||
| 22 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| 23 | +# | ||
| 24 | +# ========================================================================== | ||
| 25 | +import sys | ||
| 26 | +import math | ||
| 27 | +from gammalib import * | ||
| 28 | + | ||
| 29 | + | ||
| 30 | +# ================= # | ||
| 31 | +# Show PHA spectrum # | ||
| 32 | +# ================= # | ||
| 33 | +def show_pha(pha): | ||
| 34 | + """ | ||
| 35 | + """ | ||
| 36 | + # Create figure | ||
| 37 | + plt.figure(1) | ||
| 38 | + plt.title("PHA spectrum (" + pha.filename() + ")") | ||
| 39 | + | ||
| 40 | + # Generate energy vector | ||
| 41 | + energy = [] | ||
| 42 | + channels = False | ||
| 43 | + if pha.ebounds().size() > 0: | ||
| 44 | + for i in range(pha.ebounds().size()): | ||
| 45 | + energy.append(pha.ebounds().elogmean(i).TeV()) | ||
| 46 | + else: | ||
| 47 | + for i in range(pha.size()): | ||
| 48 | + energy.append(float(i+1)) | ||
| 49 | + channels = True | ||
| 50 | + | ||
| 51 | + # Generate data and error vector | ||
| 52 | + counts = [0.0 for i in range(pha.size())] | ||
| 53 | + for i in range(pha.size()): | ||
| 54 | + counts[i] = pha[i] | ||
| 55 | + error = [math.sqrt(c) for c in counts] | ||
| 56 | + | ||
| 57 | + # Plot data | ||
| 58 | + if channels: | ||
| 59 | + plt.semilogy(energy, counts, 'ro') | ||
| 60 | + else: | ||
| 61 | + plt.loglog(energy, counts, 'ro') | ||
| 62 | + plt.errorbar(energy, counts, error, fmt=None, ecolor='r') | ||
| 63 | + | ||
| 64 | + # Set axes | ||
| 65 | + if channels: | ||
| 66 | + plt.xlabel("Channels") | ||
| 67 | + else: | ||
| 68 | + plt.xlabel("Energy (TeV)") | ||
| 69 | + plt.ylabel("Counts") | ||
| 70 | + | ||
| 71 | + # Show plot | ||
| 72 | + plt.show() | ||
| 73 | + | ||
| 74 | + # Return | ||
| 75 | + #return | ||
| 76 | + | ||
| 77 | + | ||
| 78 | +# ======================== # | ||
| 79 | +# Main routine entry point # | ||
| 80 | +# ======================== # | ||
| 81 | +if __name__ == '__main__': | ||
| 82 | + """ | ||
| 83 | + Display spectrum in PHA format. | ||
| 84 | + """ | ||
| 85 | + # Print usage information | ||
| 86 | + usage = "Usage: show_pha filename" \ | ||
| 87 | + " [-n bins] [-c column] [-t title] [-p plot]" | ||
| 88 | + if len(sys.argv) < 2: | ||
| 89 | + print(usage) | ||
| 90 | + sys.exit() | ||
| 91 | + | ||
| 92 | + # Extract parameters | ||
| 93 | + filename = sys.argv[1] | ||
| 94 | + | ||
| 95 | + # Load PHA spectrum | ||
| 96 | + pha = GPha(filename) | ||
| 97 | + #print(pha) | ||
| 98 | + | ||
| 99 | + # Try importing matplotlib | ||
| 100 | + try: | ||
| 101 | + import matplotlib.pyplot as plt | ||
| 102 | + has_matplotlib = True | ||
| 103 | + except ImportError: | ||
| 104 | + print("Matplotlib is not (correctly) installed on your system.") | ||
| 105 | + has_matplotlib = False | ||
| 106 | + | ||
| 107 | + # Show PHA spectrum | ||
| 108 | + if has_matplotlib: | ||
| 109 | + show_pha(pha) | ||
| 110 | + | ||
| 0 | \ No newline at end of file | 111 | \ No newline at end of file |