You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
28 lines
695 B
28 lines
695 B
2 years ago
|
/*
|
||
|
|
* Copyright(C) 1999-2020 National Technology & Engineering Solutions
|
||
|
|
* of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
|
||
|
|
* NTESS, the U.S. Government retains certain rights in this software.
|
||
|
|
*
|
||
|
|
* See packages/seacas/LICENSE for details
|
||
|
|
*/
|
||
|
|
|
||
|
|
double determinant(double M[3][3], int ndims)
|
||
|
|
{
|
||
|
|
if (ndims == 1) {
|
||
|
|
return (M[0][0]);
|
||
|
|
}
|
||
|
|
if (ndims == 2) {
|
||
|
|
return (M[0][0] * M[1][1] - M[0][1] * M[1][0]);
|
||
|
|
}
|
||
|
|
|
||
|
|
else if (ndims == 3) {
|
||
|
|
return (M[0][0] * (M[1][1] * M[2][2] - M[2][1] * M[1][2]) -
|
||
|
|
M[1][0] * (M[0][1] * M[2][2] - M[2][1] * M[0][2]) +
|
||
|
|
M[2][0] * (M[0][1] * M[1][2] - M[1][1] * M[0][2]));
|
||
|
|
}
|
||
|
|
|
||
|
|
else {
|
||
|
|
return (0.0);
|
||
|
|
}
|
||
|
|
}
|