1 files changed, 68 insertions, 0 deletions
diff --git a/lib/factor_update.c b/lib/factor_update.c
new file mode 100644
index 0000000..a51705a
--- /dev/null
+++ b/lib/factor_update.c
@@ -0,0 +1,68 @@
+
+#include "fracture.h"
+
+void factor_update(cholmod_factor *factor, uint_t v1, uint_t v2, cholmod_common *c) {
+	uint_t n = factor->n;
+
+	cholmod_sparse *update_mat =
+			CHOL_F(allocate_sparse)(n, n, 2, true, true, 0, CHOLMOD_REAL, c);
+
+	uint_t s1, s2;
+	s1 = v1 < v2 ? v1 : v2;
+	s2 = v1 > v2 ? v1 : v2;
+
+	int_t *pp = (int_t *)update_mat->p;
+	int_t *ii = (int_t *)update_mat->i;
+	double *xx = (double *)update_mat->x;
+
+	for (uint_t i = 0; i <= s1; i++) {
+		pp[i] = 0;
+	}
+
+	for (uint_t i = s1 + 1; i <= n; i++) {
+		pp[i] = 2;
+	}
+
+	ii[0] = s1;
+	ii[1] = s2;
+	xx[0] = 1;
+	xx[1] = -1;
+
+	cholmod_sparse *perm_update_mat = CHOL_F(submatrix)(
+			update_mat, factor->Perm, factor->n, NULL, -1, true, true, c);
+
+	CHOL_F(updown)(false, perm_update_mat, factor, c);
+
+	CHOL_F(free_sparse)(&perm_update_mat, c);
+	CHOL_F(free_sparse)(&update_mat, c);
+}
+
+void factor_update2(cholmod_factor *factor, uint_t v, cholmod_common *c) {
+	uint_t n = factor->n;
+
+	cholmod_sparse *update_mat =
+			CHOL_F(allocate_sparse)(n, n, 1, true, true, 0, CHOLMOD_REAL, c);
+
+	int_t *pp = (int_t *)update_mat->p;
+	int_t *ii = (int_t *)update_mat->i;
+	double *xx = (double *)update_mat->x;
+
+	for (uint_t i = 0; i <= v; i++) {
+		pp[i] = 0;
+	}
+
+	for (uint_t i = v + 1; i <= n; i++) {
+		pp[i] = 1;
+	}
+
+	ii[0] = v;
+	xx[0] = 1;
+
+	cholmod_sparse *perm_update_mat = CHOL_F(submatrix)(
+			update_mat, factor->Perm, factor->n, NULL, -1, true, true, c);
+
+	CHOL_F(updown)(false, perm_update_mat, factor, c);
+
+	CHOL_F(free_sparse)(&perm_update_mat, c);
+	CHOL_F(free_sparse)(&update_mat, c);
+}