Start Task 2

2025.03.28/02Ex/matrix.c

@@ -0,0 +1,34 @@
+#include "matrix.h"
+#include <math.h>
+
+void init_vec_b(const double * restrict a, double * restrict b, int n)
+{
+	#pragma omp parallel for
+	for (int i = 0; i < n; ++i)
+	{
+		double sum = 0;
+
+//		#pragma omp simd reduction(+:sum)
+//		for (int k = 1; k < n; k+=2)
+//			sum += a[i * n + k];
+		
+		for (int k = 0; k < (n-1)/2; ++k)
+			sum += a[i*n + 2*k+1];
+
+		b[i] = sum;
+	}
+}
+
+
+void matvec_mul(int n, const double * restrict A, const double * restrict x, double * restrict x_k)
+{
+	#pragma	omp parallel for
+	for (int i = 0; i < n; i++)
+	{
+		double sum = 0;
+		#pragma omp simd reduction(+:sum)
+		for (int j = 0; j < n; j++)
+			sum += A[i * n + j] * x[j];
+		x_k[i] = sum;
+	}	
+}