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* lib/matrix.rb: Add Vector#cross_product, patch by Luis Ezcurdia

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[fix GH-276] [rubyspec:81eec89a124]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40273 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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marcandre 2013-04-13 03:08:28 +00:00
parent 4123b0d9db
commit 2106aa1990
3 changed files with 20 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Sat Apr 13 12:08:16 2013 Marc-Andre Lafortune <ruby-core@marc-andre.ca>
* lib/matrix.rb: Add Vector#cross_product, patch by Luis Ezcurdia
[fix GH-276] [rubyspec:81eec89a124]
Sat Apr 13 10:20:37 2013 Nobuyoshi Nakada <nobu@ruby-lang.org>
* struct.c (rb_struct_define_without_accessor, rb_struct_define),

3
NEWS
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@ -38,6 +38,9 @@ with all sufficient information, see the ChangeLog file.
=== Stdlib updates (outstanding ones only)
* Matrix
* Added Vector#cross_product.
* Net::SMTP
* Added Net::SMTP#rset to implement the RSET command

12
lib/matrix.rb
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@ -1519,6 +1519,7 @@ end
#
# Vector functions:
# * #inner_product(v)
# * #cross_product(v)
# * #collect
# * #magnitude
# * #map
@ -1757,6 +1758,17 @@ class Vector
p
end
#
# Returns the cross product of this vector whit the other.
# Vector[1, 0, 0].cross_product Vector[0, 1, 0] => Vector[0, 0, 1]
#
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] ]
end
#
# Like Array#collect.
#