diff options
| -rw-r--r-- | math.c | 4 | ||||
| -rw-r--r-- | test/ruby/test_math.rb | 2 |
2 files changed, 5 insertions, 1 deletions
@@ -283,7 +283,9 @@ math_sinh(VALUE obj, VALUE x) double tanh(double x) { - return sinh(x) / cosh(x); + const double c = cosh(x); + if (!isinf(c)) return sinh(x) / c; + return x > 0 ? 1.0 : -1.0; } #endif diff --git a/test/ruby/test_math.rb b/test/ruby/test_math.rb index ac9ab3c961..f226287442 100644 --- a/test/ruby/test_math.rb +++ b/test/ruby/test_math.rb @@ -111,6 +111,8 @@ class TestMath < Test::Unit::TestCase check(Math.sinh(0) / Math.cosh(0), Math.tanh(0)) check(Math.sinh(1) / Math.cosh(1), Math.tanh(1)) check(Math.sinh(2) / Math.cosh(2), Math.tanh(2)) + check(+1.0, Math.tanh(+1000.0)) + check(-1.0, Math.tanh(-1000.0)) end def test_acosh |