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* ext/bigdecimal/lib/bigdecimal/math.rb (BigMath.E): Use BigMath.exp.

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[Feature #6857] [ruby-core:47130]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43817 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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mrkn 2013-11-23 10:52:40 +00:00
parent b09f41587c
commit b8bbc1a310
2 changed files with 6 additions and 14 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Sat Nov 23 19:52:00 2013 Kenta Murata <mrkn@mrkn.jp>
* ext/bigdecimal/lib/bigdecimal/math.rb (BigMath.E): Use BigMath.exp.
[Feature #6857] [ruby-core:47130]
Sat Nov 23 19:46:00 2013 Kenta Murata <mrkn@mrkn.jp>
* ext/bigdecimal/bigdecimal.c (BigMath_s_exp): Optimize the

15
ext/bigdecimal/lib/bigdecimal/math.rb
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@ -226,19 +226,6 @@ module BigMath
#
def E(prec)
raise ArgumentError, "Zero or negative precision for E" if prec <= 0
n = prec + BigDecimal.double_fig
one = BigDecimal("1")
y = one
d = y
z = one
i = 0
while d.nonzero? && ((m = n - (y.exponent - d.exponent).abs) > 0)
m = BigDecimal.double_fig if m < BigDecimal.double_fig
i += 1
z *= i
d = one.div(z,m)
y += d
end
y
BigMath.exp(1, prec)
end
end