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#include <stdlib.h>
static inline void
product (size_t n,
size_t omega,
const double *restrict temporal_dependency,
const double *restrict vector,
double *restrict out)
{
size_t i;
#pragma omp parallel for
for (i = 0; i < n; i++)
{
size_t j;
out[i] = 0;
/* Backward: */
for (j = 0; j < omega; j++)
{
if (i > j)
{
const double x = vector[i - j - 1];
const double coefficient = temporal_dependency[j];
out[i] += coefficient * (vector[i] - x);
}
}
/* Forward: */
for (j = 0; j < omega; j++)
{
if (i + j + 1 < n)
{
const double x = vector[i + j + 1];
const double coefficient = temporal_dependency[j];
out[i] += coefficient * (vector[i] - x);
}
}
}
}
void
strats_compute_laplacian_matrix_product (int *n,
int *d,
int *omega,
double *temporal_dependency,
double *x,
double *out)
{
int j;
for (j = 0; j < *d; j++)
{
product (*n, *omega, temporal_dependency, x + j * (*n), out + j * (*n));
}
}
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