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* 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]

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27734 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
mrkn 2010-05-11 05:11:59 +00:00
parent 3b0e399c03
commit 74365313f7
3 changed files with 10 additions and 1 deletions
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7
ChangeLog
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@ -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.

2
ext/bigdecimal/lib/bigdecimal/math.rb
View file

@ -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

2
test/bigdecimal/test_bigmath.rb
View file

@ -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