filenames and namespace fixes

computer_oriented_statistical_methods/secant_method.cpp

@@ -0,0 +1,37 @@
+#include <cmath>
+#include <iostream>
+
+float eq(float i) {
+    return (pow(i, 3) - (4 * i) - 9);  // original equation
+}
+
+int main() {
+    float a, b, z, c, m, n;
+    for (int i = 0; i < 100; i++) {
+        z = eq(i);
+        if (z >= 0) {
+            b = i;
+            a = --i;
+            break;
+        }
+    }
+
+    std::cout << "\nFirst initial: " << a;
+    std::cout << "\nSecond initial: " << b;
+    for (int i = 0; i < 100; i++) {
+        float h, d;
+        m = eq(a);
+        n = eq(b);
+
+        c = ((a * n) - (b * m)) / (n - m);
+        a = b;
+        b = c;
+
+        z = eq(c);
+        if (z > 0 && z < 0.09)  // stoping criteria
+            break;
+    }
+
+    std::cout << "\n\nRoot: " << c;
+    return 0;
+}