From 48d5a656c996e112fae70c3a209417b9d0982fbf Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Mon, 11 Oct 2010 18:08:26 -0400
Subject: Add a simple vector class.

---
 tests/Vector.cpp | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 tests/Vector.cpp

(limited to 'tests/Vector.cpp')

diff --git a/tests/Vector.cpp b/tests/Vector.cpp
new file mode 100644
index 0000000..7f53352
--- /dev/null
+++ b/tests/Vector.cpp
@@ -0,0 +1,40 @@
+#include "vZ.hpp"
+#include <cmath>
+#include <cstdlib>
+#include <iostream>
+#include <iomanip>
+
+// y' = -y (y == C*exp(-t))
+vZ::Vector<3>
+f(double t, vZ::Vector<3> y)
+{
+  return -y;
+}
+
+int
+main()
+{
+  vZ::GenericDP45Integrator<vZ::Vector<3> > integrator(f);
+  integrator.tol(1e-6).y(vZ::Vector<3>(1.0, 1.0, 1.0)).x(0.0).h(0.06);
+
+  integrator.integrate(2.0);
+
+  double actual   = integrator.y().x();
+  double expected = std::exp(-2.0);
+
+  std::cout << std::setprecision(10)
+            << "Numerical:  " << actual << std::endl
+            << "Expected:   " << expected  << std::endl
+            << "h:          " << integrator.h() << std::endl
+            << "Iterations: " << integrator.iterations() << std::endl
+            << "Rejections: " << integrator.rejections() << std::endl;
+
+  double error = std::fabs(expected - actual)/expected;
+  if (error > 1.5e-6) {
+    std::cerr << "Error:      " << 100.0*error << "%" << std::endl;
+    return EXIT_FAILURE;
+  } else {
+    std::cout << "Error:      " << 100.0*error << "%" << std::endl;
+    return EXIT_SUCCESS;
+  }
+}
-- 
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