pagerank implementation

src/vector.c

@@ -0,0 +1,43 @@
+#include <math.h>
+#include "sparse_matrix.h"
+
+void init_vector(double *vector, int size, double value) {
+    for (int i = 0; i < size; ++i) {
+        vector[i] = value;
+    }
+}
+
+double diff_norm_vector(double *vector1, double *vector2, int size) {
+    double res = 0.0;
+    for (int i = 0; i < size; ++i) {
+        res += fabs(vector1[i] - vector2[i]);
+    }
+    return res;
+}
+
+void generate_f(const SparseMatrix *matrix, double *res) {
+    int N = matrix->num_nodes;
+    init_vector(res, N, 0);
+    int num_arcs = matrix->num_arcs;
+    for (int i = 0; i < num_arcs; ++i) {
+        res[matrix->arcs[i].dest] = 1;
+    }
+}
+
+double vec_product(const double* v1, const double* v2, int N) {
+    double sum = 0.0;
+    for (int i = 0; i < N; i++) {
+        sum += v1[i] * v2[i];
+    }
+    return sum;
+}
+
+void normalize_vector(double* v, int N) {
+    double sum = 0.0;
+    for (int i = 0; i < N; i++) {
+        sum += v[i];
+    }
+    for (int i = 0; i < N; i++) {
+        v[i] /= sum;
+    }
+}