98 lines
1.5 KiB
C
98 lines
1.5 KiB
C
#include "matrix.h"
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#include <math.h>
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void init_vec_b(const double * restrict a, double * restrict b, int n)
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{
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for (int i = 0; i < n; ++i)
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{
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double sum = 0;
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for (int k = 0; k < n; k+=2)
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sum += a[i * n + k];
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b[i] = sum;
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}
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}
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void matvec_mul(int n, const double * restrict A, const double * restrict x, double * restrict x_k)
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{
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for (int i = 0; i < n; i++)
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{
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double sum = 0;
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for (int j = 0; j < n; j++)
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sum += A[i * n + j] * x[j];
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x_k[i] = sum;
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}
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}
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double get_r1(const int n, const double * restrict A, const double * restrict X)
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{
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double maximum = 0;
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if (n > 4000) return 0;
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for (int j = 0; j < n; ++j)
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{
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double sum = 0;
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for (int i = 0; i < n; ++i)
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{
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int in = i*n;
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double sum_ij = - (i == j);
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for (int k = 0; k < n; ++k)
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sum_ij += A[in + k] * X[k*n + j];
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sum += fabs(sum_ij);
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}
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if (maximum < sum)
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maximum = sum;
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}
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return maximum;
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}
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double get_r2(const int n, const double * restrict A, const double * restrict X)
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{
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double maximum = 0;
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if (n > 4000) return 0;
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for (int j = 0; j < n; ++j)
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{
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double sum = 0;
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for (int i = 0; i < n; ++i)
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{
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int in = i*n;
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double sum_ij = - (i == j);
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for (int k = 0; k < n; ++k)
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sum_ij += X[in + k] * A[k*n + j];
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sum += fabs(sum_ij);
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}
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if (maximum < sum)
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maximum = sum;
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}
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return maximum;
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}
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double get_matrix_norm(const int n, const double * restrict A)
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{
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double norm = 0;
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for (int i = 0; i < n; ++i)
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{
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double sum = 0;
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for (int j = 0; j < n; ++j)
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sum += fabs(A[i*n + j]);
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if (sum > norm)
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norm = sum;
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}
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return norm;
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}
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