#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;
    }
}