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Latest version: qgraf-3.6.6 (May 2023).
Please report any error you may happen to find. -
Programming language: Fortran 2008 for versions released since 2020 (qgraf-3.5 + ), and Fortran 77 for earlier versions.
Executables/binaries are not distributed, the program has to be compiled and linked.
Employing GNU Fortran for that task should be straightforward, eg there should be no need to specify a Fortran standard (see eg fileqgraf-3.6.6.pdf ). There are binary/executable versions of GFortran for several operating systems, as described in the GFortranBinaries webpage. -
The
features added in the last two versions include (eg):
inputing simple command-line arguments (3.5);
generating multiple output-files in the same run (3.5);
a more generalloops statement (3.6);
an extended language for describing input models (3.6);
thepartition statement (3.6). -
Current plans: qgraf-3.4 should be available and supported for some time yet (minimal fixes as need be), andqgraf-3.6 is now a stable version too; the Fortran and C interfaces should appear in the next version. -
Notice: for better future-proofing, packages that try to download this program should do so by using the URL that includes the "links" directory (as described in any recent manual, section ‘Automatic downloads’ or similar title) — or perhaps using it as an alternative URL.
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Automatic Feynman graph generation
J. Comput. Phys. 105 (1993) 279–289
https://doi.org/ 10.1006/jcph.1993.1074
The next paper shows that the diagram generation with explicitly mixed propagators can be reduced to the usual one.
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Feynman graph generation and propagator mixing, I
Comput. Phys. Commun. 269 (2021) 108103
https://doi.org/ 10.1016/j.cpc.2021.108103