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authorTavian Barnes <tavianator@gmail.com>2010-10-06 21:50:48 -0400
committerTavian Barnes <tavianator@gmail.com>2010-10-06 21:50:48 -0400
commitf1983adb487bb531c1c68226596b26eebf99876a (patch)
treec0700c79531e598b827d13a46eff18a3a6153967 /tests
parentd5639168232d1c111d6924b10c6abd74204abec1 (diff)
downloadvz-f1983adb487bb531c1c68226596b26eebf99876a.tar.xz
Add Heun-Euler adaptive method.
Diffstat (limited to 'tests')
-rw-r--r--tests/HE12.cpp39
-rw-r--r--tests/Makefile.am4
2 files changed, 42 insertions, 1 deletions
diff --git a/tests/HE12.cpp b/tests/HE12.cpp
new file mode 100644
index 0000000..9a556ef
--- /dev/null
+++ b/tests/HE12.cpp
@@ -0,0 +1,39 @@
+#include "vZ.hpp"
+#include <cmath>
+#include <cstdlib>
+#include <iostream>
+#include <iomanip>
+
+// y' = y (y == C*exp(t))
+double
+f(double t, double y)
+{
+ return y;
+}
+
+int
+main()
+{
+ double tol = 1e-6;
+ vZ::HE12Integrator integrator(f);
+ integrator.atol(tol).rtol(tol).y(1.0).x(0.0).h(0.02);
+
+ integrator.integrate(2.0);
+
+ double actual = integrator.y();
+ double expected = std::exp(2.0);
+
+ std::cout << std::setprecision(10)
+ << "Numerical: " << actual << std::endl
+ << "Expected: " << expected << std::endl
+ << "h: " << integrator.h() << std::endl;
+
+ double error = std::fabs(expected - actual)/expected;
+ if (error > 8.7e-7) {
+ std::cerr << "Error: " << 100.0*error << "%" << std::endl;
+ return EXIT_FAILURE;
+ } else {
+ std::cout << "Error: " << 100.0*error << "%" << std::endl;
+ return EXIT_SUCCESS;
+ }
+}
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 0baa463..e3c7601 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -22,10 +22,12 @@ INCLUDES = -I$(top_srcdir)/src
check_PROGRAMS = Euler-test \
Midpoint-test \
Heun-test \
- RK4-test
+ RK4-test \
+ HE12-test
TESTS = $(check_PROGRAMS)
Euler_test_SOURCES = Euler.cpp
Midpoint_test_SOURCES = Midpoint.cpp
Heun_test_SOURCES = Heun.cpp
RK4_test_SOURCES = RK4.cpp
+HE12_test_SOURCES = HE12.cpp