diff options
Diffstat (limited to '')
| -rw-r--r-- | libtellurian_normal_gravity_radians.c | 37 |
1 files changed, 34 insertions, 3 deletions
diff --git a/libtellurian_normal_gravity_radians.c b/libtellurian_normal_gravity_radians.c index 3fdb037..d1d55c8 100644 --- a/libtellurian_normal_gravity_radians.c +++ b/libtellurian_normal_gravity_radians.c @@ -1,5 +1,6 @@ /* See LICENSE file for copyright and license details. */ #include "common.h" +#ifndef TEST double @@ -8,11 +9,41 @@ libtellurian_normal_gravity_radians(double latitude) double a = LIBTELLURIAN_EQUATORIAL_RADIUS; double b = LIBTELLURIAN_POLAR_RADIUS; double neg_e2 = fma(b / a, b / a, -1.0); - double ag = a * LIBTELLURIAN_EQUATORIAL_GRAVITY; - double bg = b * LIBTELLURIAN_POLAR_GRAVITY; + double ag = a * LIBTELLURIAN_NORMAL_EQUATORIAL_GRAVITY; + double bg = b * LIBTELLURIAN_NORMAL_POLAR_GRAVITY; double k = bg / ag - 1.0; double sin2_phi = sin(latitude) * sin(latitude); double num = fma(k, sin2_phi, 1.0); double denom2 = fma(neg_e2, sin2_phi, 1.0); - return LIBTELLURIAN_EQUATORIAL_GRAVITY * num / sqrt(denom2); + return LIBTELLURIAN_NORMAL_EQUATORIAL_GRAVITY * num / sqrt(denom2); } + + +#else + + +static int +approx(double a, double b) +{ + return fabs(a / b - 1.0) <= 1e-12; +} + +int +main(void) +{ + ASSERT(approx(libtellurian_normal_gravity_radians(D30), libtellurian_normal_gravity_radians(-D30))); + ASSERT(approx(libtellurian_normal_gravity_radians(D45), libtellurian_normal_gravity_radians(-D45))); + ASSERT(approx(libtellurian_normal_gravity_radians(D60), libtellurian_normal_gravity_radians(-D60))); + ASSERT(approx(libtellurian_normal_gravity_radians(D90), libtellurian_normal_gravity_radians(-D90))); + ASSERT(approx(libtellurian_normal_gravity_radians(D180), libtellurian_normal_gravity_radians(0))); + ASSERT(approx(libtellurian_normal_gravity_radians(-D180), libtellurian_normal_gravity_radians(0))); + ASSERT(approx(libtellurian_normal_gravity_radians(2.0), libtellurian_normal_gravity_radians(-2.0))); + ASSERT(approx(libtellurian_normal_gravity_radians(0), LIBTELLURIAN_NORMAL_EQUATORIAL_GRAVITY)); + ASSERT(approx(libtellurian_normal_gravity_radians(D90), LIBTELLURIAN_NORMAL_POLAR_GRAVITY)); + ASSERT(libtellurian_normal_gravity_radians(D45) < LIBTELLURIAN_NORMAL_POLAR_GRAVITY); + ASSERT(libtellurian_normal_gravity_radians(D45) > LIBTELLURIAN_NORMAL_EQUATORIAL_GRAVITY); + return 0; +} + + +#endif |