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Cubic B-spline second derivatives

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This commit is contained in:
NAThompson
2019-08-07 14:10:08 -04:00
parent 44e3ed82fa
commit edfb80e76d
3 changed files with 59 additions and 0 deletions
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7
test/test_cubic_b_spline.cpp
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@@ -30,6 +30,9 @@ void test_b3_spline()
BOOST_CHECK_SMALL(boost::math::detail::b3_spline<Real>(-2.5), (Real) 0);
BOOST_CHECK_SMALL(boost::math::detail::b3_spline_prime<Real>(2.5), (Real) 0);
BOOST_CHECK_SMALL(boost::math::detail::b3_spline_prime<Real>(-2.5), (Real) 0);
BOOST_CHECK_SMALL(boost::math::detail::b3_spline_double_prime<Real>(2.5), (Real) 0);
BOOST_CHECK_SMALL(boost::math::detail::b3_spline_double_prime<Real>(-2.5), (Real) 0);
// On the boundary of support:
BOOST_CHECK_SMALL(boost::math::detail::b3_spline<Real>(2), (Real) 0);
@@ -52,6 +55,7 @@ void test_b3_spline()
Real arg = i*0.01;
BOOST_CHECK_CLOSE(boost::math::detail::b3_spline<Real>(arg), boost::math::detail::b3_spline<Real>(arg), eps);
BOOST_CHECK_CLOSE(boost::math::detail::b3_spline_prime<Real>(-arg), -boost::math::detail::b3_spline_prime<Real>(arg), eps);
BOOST_CHECK_CLOSE(boost::math::detail::b3_spline_double_prime<Real>(-arg), boost::math::detail::b3_spline_double_prime<Real>(arg), eps);
}
}
@@ -109,6 +113,9 @@ void test_constant_function()
BOOST_CHECK_CLOSE(y, constant, 10*std::numeric_limits<Real>::epsilon());
Real y_prime = spline.prime(i*step + a + 0.002);
BOOST_CHECK_SMALL(y_prime, 5000*std::numeric_limits<Real>::epsilon());
Real y_double_prime = spline.double_prime(i*step + a + 0.002);
BOOST_CHECK_SMALL(y_double_prime, 5000*std::numeric_limits<Real>::epsilon());
}
// Test that correctly specified left and right-derivatives work properly: