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78b5fdd5a8
* math.c (math_log): ditto. * math.c (math_log2): ditto. * math.c (math_log10): ditto. * test/ruby/test_math.rb: test for above. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@18252 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
239 lines
6.4 KiB
Ruby
239 lines
6.4 KiB
Ruby
require 'test/unit'
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class TestMath < Test::Unit::TestCase
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def check(a, b)
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err = [Float::EPSILON * 4, [a.abs, b.abs].max * Float::EPSILON * 256].max
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assert_in_delta(a, b, err)
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end
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def test_atan2
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check(0, Math.atan2(0, 1))
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check(Math::PI / 4, Math.atan2(1, 1))
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check(Math::PI / 2, Math.atan2(1, 0))
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end
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def test_cos
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check(1.0, Math.cos(0 * Math::PI / 4))
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check(1.0 / Math.sqrt(2), Math.cos(1 * Math::PI / 4))
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check(0.0, Math.cos(2 * Math::PI / 4))
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check(-1.0, Math.cos(4 * Math::PI / 4))
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check(0.0, Math.cos(6 * Math::PI / 4))
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end
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def test_sin
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check(0.0, Math.sin(0 * Math::PI / 4))
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check(1.0 / Math.sqrt(2), Math.sin(1 * Math::PI / 4))
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check(1.0, Math.sin(2 * Math::PI / 4))
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check(0.0, Math.sin(4 * Math::PI / 4))
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check(-1.0, Math.sin(6 * Math::PI / 4))
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end
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def test_tan
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check(0.0, Math.tan(0 * Math::PI / 4))
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check(1.0, Math.tan(1 * Math::PI / 4))
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assert(Math.tan(2 * Math::PI / 4).abs > 1024)
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check(0.0, Math.tan(4 * Math::PI / 4))
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assert(Math.tan(6 * Math::PI / 4).abs > 1024)
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end
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def test_acos
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check(0 * Math::PI / 4, Math.acos( 1.0))
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check(1 * Math::PI / 4, Math.acos( 1.0 / Math.sqrt(2)))
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check(2 * Math::PI / 4, Math.acos( 0.0))
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check(4 * Math::PI / 4, Math.acos(-1.0))
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assert_raise(Errno::EDOM, Errno::ERANGE) { Math.acos(2.0) }
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end
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def test_asin
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check( 0 * Math::PI / 4, Math.asin( 0.0))
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check( 1 * Math::PI / 4, Math.asin( 1.0 / Math.sqrt(2)))
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check( 2 * Math::PI / 4, Math.asin( 1.0))
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check(-2 * Math::PI / 4, Math.asin(-1.0))
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assert_raise(Errno::EDOM, Errno::ERANGE) { Math.asin(2.0) }
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end
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def test_atan
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check( 0 * Math::PI / 4, Math.atan( 0.0))
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check( 1 * Math::PI / 4, Math.atan( 1.0))
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check( 2 * Math::PI / 4, Math.atan(1.0 / 0.0))
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check(-1 * Math::PI / 4, Math.atan(-1.0))
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end
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def test_cosh
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check(1, Math.cosh(0))
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check((Math::E ** 1 + Math::E ** -1) / 2, Math.cosh(1))
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check((Math::E ** 2 + Math::E ** -2) / 2, Math.cosh(2))
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end
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def test_sinh
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check(0, Math.sinh(0))
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check((Math::E ** 1 - Math::E ** -1) / 2, Math.sinh(1))
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check((Math::E ** 2 - Math::E ** -2) / 2, Math.sinh(2))
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end
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def test_tanh
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check(Math.sinh(0) / Math.cosh(0), Math.tanh(0))
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check(Math.sinh(1) / Math.cosh(1), Math.tanh(1))
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check(Math.sinh(2) / Math.cosh(2), Math.tanh(2))
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end
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def test_acosh
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check(0, Math.acosh(1))
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check(1, Math.acosh((Math::E ** 1 + Math::E ** -1) / 2))
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check(2, Math.acosh((Math::E ** 2 + Math::E ** -2) / 2))
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assert_raise(Errno::EDOM, Errno::ERANGE) { Math.acosh(0) }
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end
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def test_asinh
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check(0, Math.asinh(0))
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check(1, Math.asinh((Math::E ** 1 - Math::E ** -1) / 2))
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check(2, Math.asinh((Math::E ** 2 - Math::E ** -2) / 2))
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end
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def test_atanh
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check(0, Math.atanh(Math.sinh(0) / Math.cosh(0)))
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check(1, Math.atanh(Math.sinh(1) / Math.cosh(1)))
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check(2, Math.atanh(Math.sinh(2) / Math.cosh(2)))
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assert_raise(Errno::EDOM, Errno::ERANGE) { Math.atanh(-1) }
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end
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def test_exp
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check(1, Math.exp(0))
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check(Math.sqrt(Math::E), Math.exp(0.5))
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check(Math::E, Math.exp(1))
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check(Math::E ** 2, Math.exp(2))
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end
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def test_log
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check(0, Math.log(1))
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check(1, Math.log(Math::E))
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check(0, Math.log(1, 10))
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check(1, Math.log(10, 10))
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check(2, Math.log(100, 10))
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assert_equal(1.0/0, Math.log(1.0/0))
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assert_raise(Errno::EDOM, Errno::ERANGE) { Math.log(0) }
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assert_raise(Errno::EDOM, Errno::ERANGE) { Math.log(-1) }
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end
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def test_log2
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check(0, Math.log2(1))
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check(1, Math.log2(2))
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check(2, Math.log2(4))
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assert_equal(1.0/0, Math.log2(1.0/0))
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assert_raise(Errno::EDOM, Errno::ERANGE) { Math.log2(0) }
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assert_raise(Errno::EDOM, Errno::ERANGE) { Math.log2(-1) }
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end
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def test_log10
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check(0, Math.log10(1))
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check(1, Math.log10(10))
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check(2, Math.log10(100))
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assert_equal(1.0/0, Math.log10(1.0/0))
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assert_raise(Errno::EDOM, Errno::ERANGE) { Math.log10(0) }
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assert_raise(Errno::EDOM, Errno::ERANGE) { Math.log10(-1) }
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end
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def test_sqrt
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check(0, Math.sqrt(0))
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check(1, Math.sqrt(1))
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check(2, Math.sqrt(4))
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assert_equal(1.0/0, Math.sqrt(1.0/0))
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assert_raise(Errno::EDOM, Errno::ERANGE) { Math.sqrt(-1) }
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end
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def test_frexp
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check(0.0, Math.frexp(0.0).first)
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assert_equal(0, Math.frexp(0).last)
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check(0.5, Math.frexp(0.5).first)
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assert_equal(0, Math.frexp(0.5).last)
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check(0.5, Math.frexp(1.0).first)
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assert_equal(1, Math.frexp(1.0).last)
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check(0.5, Math.frexp(2.0).first)
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assert_equal(2, Math.frexp(2.0).last)
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check(0.75, Math.frexp(3.0).first)
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assert_equal(2, Math.frexp(3.0).last)
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end
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def test_ldexp
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check(0.0, Math.ldexp(0.0, 0.0))
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check(0.5, Math.ldexp(0.5, 0.0))
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check(1.0, Math.ldexp(0.5, 1.0))
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check(2.0, Math.ldexp(0.5, 2.0))
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check(3.0, Math.ldexp(0.75, 2.0))
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end
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def test_hypot
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check(5, Math.hypot(3, 4))
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end
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def test_erf
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check(0, Math.erf(0))
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check(1, Math.erf(1.0 / 0.0))
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end
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def test_erfc
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check(1, Math.erfc(0))
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check(0, Math.erfc(1.0 / 0.0))
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end
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def test_gamma
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sqrt_pi = Math.sqrt(Math::PI)
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check(4 * sqrt_pi / 3, Math.gamma(-1.5))
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check(-2 * sqrt_pi, Math.gamma(-0.5))
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check(sqrt_pi, Math.gamma(0.5))
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check(1, Math.gamma(1))
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check(sqrt_pi / 2, Math.gamma(1.5))
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check(1, Math.gamma(2))
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check(3 * sqrt_pi / 4, Math.gamma(2.5))
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check(2, Math.gamma(3))
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check(15 * sqrt_pi / 8, Math.gamma(3.5))
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check(6, Math.gamma(4))
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end
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def test_lgamma
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sqrt_pi = Math.sqrt(Math::PI)
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g, s = Math.lgamma(-1.5)
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check(Math.log(4 * sqrt_pi / 3), g)
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assert_equal(s, 1)
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g, s = Math.lgamma(-0.5)
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check(Math.log(2 * sqrt_pi), g)
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assert_equal(s, -1)
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g, s = Math.lgamma(0.5)
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check(Math.log(sqrt_pi), g)
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assert_equal(s, 1)
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assert_equal([0, 1], Math.lgamma(1))
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g, s = Math.lgamma(1.5)
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check(Math.log(sqrt_pi / 2), g)
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assert_equal(s, 1)
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assert_equal([0, 1], Math.lgamma(2))
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g, s = Math.lgamma(2.5)
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check(Math.log(3 * sqrt_pi / 4), g)
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assert_equal(s, 1)
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g, s = Math.lgamma(3)
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check(Math.log(2), g)
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assert_equal(s, 1)
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g, s = Math.lgamma(3.5)
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check(Math.log(15 * sqrt_pi / 8), g)
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assert_equal(s, 1)
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g, s = Math.lgamma(4)
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check(Math.log(6), g)
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assert_equal(s, 1)
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end
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def test_cbrt
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check(1, Math.cbrt(1))
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check(-2, Math.cbrt(-8))
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check(3, Math.cbrt(27))
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check(-0.1, Math.cbrt(-0.001))
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end
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end
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