ex3

ex3/code/task_5.cpp

@@ -0,0 +1,33 @@
+#include "task_4+6.h"
+#include "task_5.h"
+#include "timing.h"
+#include <vector>
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double norm(vector<double> const &x) {
+    size_t N = x.size();
+    double sum = 0.0;
+    for (size_t i = 0; i < N; ++i) {
+        sum += x[i] * x[i];
+    }
+    return sqrt(sum);
+}
+
+vector<double> init_norm(size_t N) {
+    vector<double> x(N);
+    for (size_t i = 0; i < N; ++i) {
+        x[i] = i%219 + 1.0;
+    }
+    return x;
+}
+
+void benchmark_norm(vector<double> const &x, size_t NLOOPS) {
+    double s(0.0), sum(0.0);
+    for (size_t i = 0; i < NLOOPS; ++i) {
+        s = norm(x);
+        sum += s;
+    }
+    printf("||x|| = %f\n", sum/NLOOPS);
+}