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authorTavian Barnes <tavianator@gmail.com>2010-10-06 23:00:58 -0400
committerTavian Barnes <tavianator@gmail.com>2010-10-06 23:00:58 -0400
commit486a188b074c0c4f3ad771f536159e1bd2045fe2 (patch)
tree490bf76b27b404cfd65ed3380ec4c57d1b10ffc7 /tests/BS23.cpp
parent25cc2bf981d52f0c7688b1e380b795f0cda8a852 (diff)
downloadvz-486a188b074c0c4f3ad771f536159e1bd2045fe2.tar.xz
Add Bogacki-Shampine method.
Diffstat (limited to 'tests/BS23.cpp')
-rw-r--r--tests/BS23.cpp39
1 files changed, 39 insertions, 0 deletions
diff --git a/tests/BS23.cpp b/tests/BS23.cpp
new file mode 100644
index 0000000..15abd0c
--- /dev/null
+++ b/tests/BS23.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()
+{
+ vZ::BS23Integrator integrator(f);
+ integrator.tol(1e-6).y(1.0).x(0.0).h(0.03);
+
+ 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 > 4.8e-6) {
+ std::cerr << "Error: " << 100.0*error << "%" << std::endl;
+ return EXIT_FAILURE;
+ } else {
+ std::cout << "Error: " << 100.0*error << "%" << std::endl;
+ return EXIT_SUCCESS;
+ }
+}