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authormrkn <mrkn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2010-05-11 05:11:59 +0000
committermrkn <mrkn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2010-05-11 05:11:59 +0000
commit74365313f7db803628c75644c558ca60a64768ff (patch)
tree00ff4c7132c82df3fff657767399725013621f68
parent3b0e399c0338a2c7570b34b805b8ced90201850b (diff)
* ext/bigdecimal/lib/bigdecimal/math.rb (atan), test/bigdecimal/test_bigmath.rb (test_atan): explicitly specify the precision for calculating a reciprocal number of an argument. [Bug #3267]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27734 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
-rw-r--r--ChangeLog7
-rw-r--r--ext/bigdecimal/lib/bigdecimal/math.rb2
-rw-r--r--test/bigdecimal/test_bigmath.rb2
3 files changed, 10 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog
index 77a99018a1..b35128c1e6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Tue May 11 13:46:00 2010 Kenta Murata <mrkn@mrkn.jp>
+
+ * ext/bigdecimal/lib/bigdecimal/math.rb (atan),
+ test/bigdecimal/test_bigmath.rb (test_atan): explicitly specify
+ the precision for calculating a reciprocal number of an argument.
+ [Bug #3267]
+
Tue May 11 11:49:44 2010 Nobuyoshi Nakada <nobu@ruby-lang.org>
* ext/sdbm/sdbm.h (DBM): large file support on win32.
diff --git a/ext/bigdecimal/lib/bigdecimal/math.rb b/ext/bigdecimal/lib/bigdecimal/math.rb
index eeffde4e68..07efcbe099 100644
--- a/ext/bigdecimal/lib/bigdecimal/math.rb
+++ b/ext/bigdecimal/lib/bigdecimal/math.rb
@@ -125,7 +125,7 @@ module BigMath
x = -x if neg = x < 0
return pi.div(neg ? -2 : 2, prec) if x.infinite?
return pi / (neg ? -4 : 4) if x.round(prec) == 1
- x = 1 / x if inv = x > 1
+ x = BigDecimal("1").div(x, prec) if inv = x > 1
x = (-1 + sqrt(1 + x**2, prec))/x if dbl = x > 0.5
n = prec + BigDecimal.double_fig
y = x
diff --git a/test/bigdecimal/test_bigmath.rb b/test/bigdecimal/test_bigmath.rb
index fbeb06221b..453c47ec6b 100644
--- a/test/bigdecimal/test_bigmath.rb
+++ b/test/bigdecimal/test_bigmath.rb
@@ -57,6 +57,8 @@ class TestBigMath < Test::Unit::TestCase
assert_in_delta(Math::PI/4, atan(BigDecimal("1.0"), N))
assert_in_delta(Math::PI/6, atan(sqrt(BigDecimal("3.0"), N) / 3, N))
assert_in_delta(Math::PI/2, atan(PINF, N))
+ assert_equal(BigDecimal("0.823840753418636291769355073102514088959345624027952954058347023122539489"),
+ atan(BigDecimal("1.08"), 72).round(72), '[ruby-dev:41257]')
end
def test_exp