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* lib/matrix.rb: Fix sign for cross_product [#9499]

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46780 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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marcandre 2014-07-11 05:19:33 +00:00
parent 9412551ee2
commit 72d0536606
3 changed files with 12 additions and 3 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
Fri Jul 11 14:19:14 2014 Marc-Andre Lafortune <ruby-core@marc-andre.ca>
* lib/matrix.rb: Fix sign for cross_product [#9499]
Fri Jul 11 11:11:50 2014 Koichi Sasada <ko1@atdot.net>
* benchmark/prepare_so_k_nucleotide.rb: use require_relative.

6
lib/matrix.rb
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@ -1811,9 +1811,9 @@ class Vector
#
def cross_product(v)
Vector.Raise ErrDimensionMismatch unless size == v.size && v.size == 3
Vector[ v[1]*@elements[2] - v[2]*@elements[1],
v[2]*@elements[0] - v[0]*@elements[2],
v[0]*@elements[1] - v[1]*@elements[0] ]
Vector[ v[2]*@elements[1] - v[1]*@elements[2],
v[0]*@elements[2] - v[2]*@elements[0],
v[1]*@elements[0] - v[0]*@elements[1] ]
end
#

5
test/matrix/test_vector.rb
View file

@ -146,4 +146,9 @@ class TestVector < Test::Unit::TestCase
v = Vector[Rational(1,2), 0]
assert_equal(0.5, v.norm)
end
def test_cross_product
v = Vector[1, 0, 0].cross_product Vector[0, 1, 0]
assert_equal(Vector[0, 0, 1], v)
end
end