From ae956bffbf796005e1f59a9c430cef69e21e13f6 Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Wed, 6 Oct 2010 23:42:05 -0400 Subject: Add RKF45 method. --- tests/RKF45.cpp | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 tests/RKF45.cpp (limited to 'tests/RKF45.cpp') diff --git a/tests/RKF45.cpp b/tests/RKF45.cpp new file mode 100644 index 0000000..8b87216 --- /dev/null +++ b/tests/RKF45.cpp @@ -0,0 +1,39 @@ +#include "vZ.hpp" +#include +#include +#include +#include + +// y' = y (y == C*exp(t)) +double +f(double t, double y) +{ + return y; +} + +int +main() +{ + vZ::RKF45Integrator integrator(f); + integrator.tol(1e-6).y(1.0).x(0.0).h(0.06); + + 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 + << "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; + } +} -- cgit v1.2.3