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* lib/matrix.rb (determinant): Trivial optimization (thanks to Benoit Daloze)

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27868 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
marcandre 2010-05-17 21:09:31 +00:00
parent 914efd0b60
commit ef83d7a928
1 changed files with 2 additions and 2 deletions
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4
lib/matrix.rb
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@ -747,12 +747,12 @@ class Matrix
when 2
+ m[0][0] * m[1][1] - m[0][1] * m[1][0]
when 3
m0 = m[0]; m1 = m[1]; m2 = m[2]
m0, m1, m2 = m
+ m0[0] * m1[1] * m2[2] - m0[0] * m1[2] * m2[1] \
- m0[1] * m1[0] * m2[2] + m0[1] * m1[2] * m2[0] \
+ m0[2] * m1[0] * m2[1] - m0[2] * m1[1] * m2[0]
when 4
m0 = m[0]; m1 = m[1]; m2 = m[2]; m3 = m[3]
m0, m1, m2, m3 = m
+ m0[0] * m1[1] * m2[2] * m3[3] - m0[0] * m1[1] * m2[3] * m3[2] \
- m0[0] * m1[2] * m2[1] * m3[3] + m0[0] * m1[2] * m2[3] * m3[1] \
+ m0[0] * m1[3] * m2[1] * m3[2] - m0[0] * m1[3] * m2[2] * m3[1] \