Add RK4.

2 files changed, 28 insertions, 1 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 5f94aab..edef1ae 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -20,8 +20,10 @@
 INCLUDES = -I$(top_srcdir)/src
 
 check_PROGRAMS = Euler-test                                                    \
-                 Midpoint-test
+                 Midpoint-test                                                 \
+                 RK4-test
 TESTS          = $(check_PROGRAMS)
 
 Euler_test_SOURCES    = Euler.cpp
 Midpoint_test_SOURCES = Midpoint.cpp
+RK4_test_SOURCES      = RK4.cpp
diff --git a/tests/RK4.cpp b/tests/RK4.cpp
new file mode 100644
index 0000000..8e0ca0a
--- /dev/null
+++ b/tests/RK4.cpp
@@ -0,0 +1,25 @@
+#include "vZ.hpp"
+#include <cmath>
+#include <cstdlib>
+#include <iostream>
+
+// y' = y (y == C*exp(t))
+double
+f(double t, double y)
+{
+  return y;
+}
+
+int
+main()
+{
+  vZ::RK4Integrator integrator(f);
+  integrator.y(1.0).x(0.0).h(0.04);
+
+  integrator.integrate(2.0);
+
+  std::cout << integrator.y() << std::endl
+            << std::exp(2.0)  << std::endl;
+
+  return EXIT_SUCCESS;
+}