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author | rodri <rgl@antares-labs.eu> | 2020-02-20 22:02:08 +0000 |
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committer | rodri <rgl@antares-labs.eu> | 2020-02-20 22:02:08 +0000 |
commit | 168a16b70a928ed64061bdac7fc9d52235c3f9fc (patch) | |
tree | 50ad23804ba927af802d42f2b7a450200fcbf2a7 /matrix.c | |
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git release.
Diffstat (limited to 'matrix.c')
-rw-r--r-- | matrix.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/matrix.c b/matrix.c new file mode 100644 index 0000000..12956a7 --- /dev/null +++ b/matrix.c @@ -0,0 +1,74 @@ +#include <u.h> +#include <libc.h> +#include "dat.h" +#include "fns.h" + +void +addm(Matrix a, Matrix b) +{ + int i, j; + + for(i = 0; i < 3; i++) + for(j = 0; j < 3; j++) + a[i][j] += b[i][j]; +} + +void +subm(Matrix a, Matrix b) +{ + int i, j; + + for(i = 0; i < 3; i++) + for(j = 0; j < 3; j++) + a[i][j] -= b[i][j]; +} + +void +mulm(Matrix a, Matrix b) +{ + int i, j, k; + Matrix r; + + for(i = 0; i < 3; i++) + for(j = 0; j < 3; j++){ + r[i][j] = 0; + for(k = 0; k < 3; k++) + r[i][j] += a[i][k]*b[k][j]; + } + for(i = 0; i < 3; i++) + for(j = 0; j < 3; j++) + a[i][j] = r[i][j]; +} + +void +transm(Matrix m) +{ + int i, j; + double tmp; + + for(i = 0; i < 3; i++) + for(j = i; j < 3; j++){ + tmp = m[i][j]; + m[i][j] = m[j][i]; + m[j][i] = tmp; + } +} + +double +detm(Matrix m) +{ + return m[0][0]*(m[1][1]*m[2][2] - m[1][2]*m[2][1]) + + m[0][1]*(m[1][2]*m[2][0] - m[1][0]*m[2][2]) + + m[0][2]*(m[1][0]*m[2][1] - m[1][1]*m[2][0]); +} + +Vector +mulvecm(Vector v, Matrix m) +{ + Vector r; + + r.x = v.x * m[0][0] + v.y * m[0][1] + v.w * m[0][2]; + r.y = v.x * m[1][0] + v.y * m[1][1] + v.w * m[1][2]; + r.w = v.x * m[2][0] + v.y * m[2][1] + v.w * m[2][2]; + return r; +} |