Wolfgang Tichy, 11/2023:
sgrid is a code for numerical relativity using spectral methods. The code is public under the GPL, see the files LICENSE and COPYING.
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The main documentation and compilation instructions are in doc/sgrid.txt, but see also doc/MyConfig.example.
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In addition, there is help on installation and compilation at: https://www.physics.fau.edu/~wolf/Research/FAU-sgrid
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Furthermore, many dirs have Note.txt files with additional hints.