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27 lines
695 B
27 lines
695 B
/*
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* Copyright(C) 1999-2020 National Technology & Engineering Solutions
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* of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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* NTESS, the U.S. Government retains certain rights in this software.
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*
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* See packages/seacas/LICENSE for details
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*/
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double determinant(double M[3][3], int ndims)
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{
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if (ndims == 1) {
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return (M[0][0]);
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}
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if (ndims == 2) {
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return (M[0][0] * M[1][1] - M[0][1] * M[1][0]);
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}
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else if (ndims == 3) {
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return (M[0][0] * (M[1][1] * M[2][2] - M[2][1] * M[1][2]) -
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M[1][0] * (M[0][1] * M[2][2] - M[2][1] * M[0][2]) +
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M[2][0] * (M[0][1] * M[1][2] - M[1][1] * M[0][2]));
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}
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else {
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return (0.0);
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}
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}
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