- Version: 2.0.0.dev (22 October 2021)
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/.
The GammaLib is a versatile toolbox for the high-level analysis of astronomical gamma-ray data. It is implemented as a C++ library that is fully scriptable in the Python scripting language. The library provides core functionalities such as data input and output, interfaces for parameter specifications, and a reporting and logging interface. It implements instruments specific functionalities such as instrument response functions and data formats. Instrument specific functionalities share a common interface to allow for extension of the GammaLib to include new gamma-ray instruments. The GammaLib provides an abstract data analysis framework that enables simultaneous multi-mission analysis.
- http://cta.irap.omp.eu/gammalib/ - for end users
- https://cta-redmine.irap.omp.eu/projects/gammalib - for developers
GammaLib should compile on every modern Unix system without any need to install other libraries.
To enable support for FITS file handling, however, the cfitsio library from HEASARC needs to be installed. cfitsio can be downloaded from http://heasarc.gsfc.nasa.gov/fitsio and detailed installation instructions can be found there. If cfitsio does not already exist on your system, we recommend installation of cfitsio in the default GammaLib install directory as a shared library by typing:
$ ./configure --prefix=/usr/local/gamma $ make shared $ make install
GammaLib can also benefit from the presence of the readline library that provides line-editing and history capabilities for text input (GammaLib offers however also full functionality without having readline installed). readline requires the ncurses library. Both libraries can be downloaded from http://ftp.gnu.org/gnu/.
The easiest is to install GammaLib via conda. This also takes care of the installation of cfitsio. Assuming that you have installed anaconda, type the following:
$ conda config --append channels conda-forge $ conda config --append channels cta-observatory $ conda install gammalib
To build, verify and install GammaLib, simply type the following:
$ ./configure $ make $ make check $ make install
If the folder does not contain any
configure file, please run
By default GammaLib installs itself in
/usr/local/gamma. If you need to
install GammaLib in a different location or in your home directory, use
--prefix option to
./configure. For example:
$ ./configure --prefix=/home/yourname/projects $ make $ make check $ make install
The file INSTALL details more about using configure. Also try
$ ./configure --help.
make check command will run an extensive unit test to verify that
GammaLib was correctly built. Make sure that all tests were successful.
GammaLib is known to work on various flavors of Mac OS. To cope with different system versions and architectures, there are two Mac specific configure options:
$ ./configure --enable-universalsdk[=PATH]
creates a universal build of GammaLib. The optional argument specifies
which MacOS SDK should be used to perform the build. This defaults to
/ when building on a 10.5
system or higher, especially when building 64-bit code.
$ ./configure --with-univeral-archs=VALUE
specifies the kind of universal build that should be created. Possible
all. By default, a
build will be made. This option is only valid when
--enable-universalsdk is specified.
These options are in particular needed if your Python architecture differs from the default architecture of your system. To examine the Python architecture you may type:
$ file `which python`
which will return the architectures that are compiled in the Mach-0 executable:
i386 32-bit intel ppc 32-bit powerpc ppc64 64-bit powerpc x86_64 64-bit intel
If Python is 32-bit (ppc, i386) but the compiler produces by default 64-bit code (ppc64, x86_64), the Python module will not work. Using
$ ./configure --enable-universalsdk=/
will force a universal 32-bit build which creates code for ppc and i386. If on the other hand Python is 64-bit (ppc64, x86_64) but the compiler produces by default 32-bit code (ppc, i386), the option
$ ./configure --enable-universalsdk=/ --with-univeral-archs=3-way
will generate a universal build which contains 32-bit and 64-bit code.
GammaLib has been tested on FreeBSD successfully. Follow the Linux installation instructions above.
GammaLib compiles on Solaris and openSolaris using the GNU compiler collection. Follow the Linux installation instructions above. GammaLib also compiles using the Sun Studio compiler, but due to some unexpected handling of global variables, it is not fully working (see "Known problems" below). Please note that these is also a cfitsio problem on Solaris, please refer to the section "Known problems" for more information.
On Windows GammaLib needs to be installed into a virtual machine running a Linux distribution.
After building and before installing GammaLib, you should run the extensive unit test by typing:
$ make check
If everything works successfully you should see
=================== All 22 tests passed ===================
============================================================================ Testsuite summary for gammalib 2.0.0.dev ============================================================================ # TOTAL: 22 # PASS: 22 # SKIP: 0 # XFAIL: 0 # FAIL: 0 # XPASS: 0 # ERROR: 0 ============================================================================
at the end of the test (depending on your automake version). If no Python support was compiled in, the number of tests performed will be reduced by one.
Before using GammaLib you have to setup some environment variables. This will be done automatically by an initialisation script that will be installed in the bin directory.
Assuming that you have installed GammaLib in the default directory
/usr/local/gamma you need to add the following to your
$HOME/.profile script on a Linux machine:
export GAMMALIB=/usr/local/gamma source $GAMMALIB/bin/gammalib-init.sh
If you use C shell or a variant then add the following to your
setenv GAMMALIB /usr/local/gamma source $GAMMALIB/bin/gammalib-init.csh
The easiest way to start with GammaLib is by using the python interface. To start, type the following:
$ python >>> import gammalib >>> models=gammalib.GModels() >>> print models === GModels === Number of models ..........: 0 Number of parameters ......: 0
This examples allocates an empty GModels object that holds a collection of models.
For examples, inspect the test directory, and the test directories
of the instrument specific interfaces, e.g.
The doc directory (usually at
contains the most recent set of updated documentation for this release.
A detailed documentation can be created by typing:
$ make doc
before installing the library. Two types of documentation exist:
- code documentation
- user documentation
Code documentation is created using Doxygen. You need Doxygen on your system to generate the code documentation. This includes man pages. Doxygen can be obtained from http://www.stack.nl/~dimitri/doxygen/.
User documentation is created using Sphinx. You need Sphinx on your system to generate the user documentation. Sphinx can be obtained from http://sphinx-doc.org/install.html.
To report or search for bugs, please use the GammaLib Bug Tracker at https://cta-redmine.irap.omp.eu/projects/gammalib. Before using the tracker, please read https://cta-redmine.irap.omp.eu/projects/gammalib/wiki/Submission_guidelines
GammaLib comes with Python wrappers so that all classes can be directly used from Python. To compile-in Python support, GammaLib needs the Python.h header file, which on many distributions is not installed by default. To make Python.h available, install the Python developer package in your distribution. Otherwise you will not be able to use GammaLib from Python.
Many distributions do not have the readline header files and symbolic
link to the shared library set up by default. The same is true for the
ncurses library that is needed by readline. To properly compile-in
readline support in GammaLib, make sure that the redline header files
exist and that the symbolic links are set. In many distributions,
the shared redline and ncurses are located in
/lib, while the symbolic
links are in
/usr/lib. Make sure that you have symbolic links with
Symbolic links with an additional number attached, such as
libncurses.so.5 (which are found in many
distributions in the
/lib directory) are not sufficient.
In many distributions, the appropriate headers and symbolic links
are installed if the proper readline and ncurses developer
packages are installed.
Although GammaLib builds on Solaris using the Sun compiler, there are problems with global symbols in the shared library that prevent the model registry to work correctly. Furthermore, GammaLib is not able to catch its own exceptions, which prevents the FITS interface to work correctly. GammaLib has however been built and tested successfully using the GNU compiler, and this is the only build method that is currently supported. Problems have also been encountered when compiling cfitsio versions more recent than 3.250. The problems have been reported to the cfitsio developer team, and are likely to be solved in the future. For the time being, it is recommended to use cfitsio version 3.250 on Solaris.
On OpenSolaris, the same problems concerning the SunStudio compiler occur as for Solaris, and also here, the GNU compiler is the recommended tool to build GammaLib. Also here, cfitsio version 3.250 is the recommended library as more recent version feature relocation problems. GammaLib has been tested using gcc 4.3.2 on OpenSolaris 2009.06. Make sure to create the symbolic links
ln -s /usr/bin/gcc4.3.2 /usr/bin/gcc ln -s /usr/bin/g++4.3.2 /usr/bin/g++
which are not there by default to avoid excess warnings during
For OpenSolaris 2009.06, no readline package is available, hence
readline support is not readily available. Readline support can however
be enabled by directly installing the GNU ncurses and readline packages
from source (http://ftp.gnu.org/gnu). This has been done successfully
on OpenSolaris 2009.06 for ncurses-5.9 and readline-6.2. Make sure
to specify the
--with-shared option when configuring ncurses, so
that the shared library will be built and installed. Otherwise,
relocation errors may occur during compilation of GammaLib.
To get in touch with the GammaLib developers and to contribute to the project please contact Juergen Knoedlseder email@example.com.