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/**
* linalg.c
* --------
*
* purpose: provide some algebra functions
*
* @author ilhan oezgen, wahyd, ilhan.oezgen@wahyd.tu-berlin.de
* @date 15 apr 17
* @date 3 may 17
**/
// ----------------------------------------------------------------------------
#include <stdlib.h>
#include <math.h>
#include <omp.h>
#include "global.h"
#include "linalg.h"
// ----------------------------------------------------------------------------
/**
* put a val into the diag matrix dia
**/
void put(struct diag* dia, int r, int c, double val)
{
int len_ids = dia->len_id;
int len_d = dia->len_d;
int id = c - r;
for (int i = 0; i < len_ids; i ++) {
if (dia->ids[i] == id) {
dia->values[i * len_d + r] = val;
break;
}
}
}
/**
* get a value (r,c) from diag matrix dia
**/
double get(struct diag* dia, int r, int c)
{
int len_ids = dia->len_id;
int len_d = dia->len_d;
int id = c - r;
double val = 0.0;
for (int i = 0; i < len_ids; i ++) {
if (dia->ids[i] == id) {
val = dia->values[i * len_d + r];
break;
}
}
return val;
}
/**
* calculate matrix vector multiplication
**/
void multiply(struct diag* dia, double* v, double* av)
{
int len_c = dia->len_c;
int len_r = dia->len_r;
#pragma omp parallel for
for (int i = 0; i < len_r; i ++) {
for (int j = 0; j < len_c; j ++) {
av[i] = av[i] + get(dia, i, j) * v[j];
}
}
}
/**
* return the dot product of vectors v1 and v2
**/
double dot(double* v1, double* v2, int len)
{
double dot_product = 0.0;
for (int i = 0; i < len; i ++) {
dot_product = dot_product + v1[i] * v2[i];
}
return dot_product;
}
/**
* return the L2-norm of the vector
**/
double norm(double* v, int len)
{
return sqrt(dot(v, v, len));
}
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