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* lib/matrix.rb (Matrix#inverse_from): use #quo. backported r9490.

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* lib/matrix.rb (Matrix#determinant): ditto.  [ruby-core:27507]

* lib/matrix.rb (Matrix#rank): ditto.

* lib/matrix.rb (Matrix::Scalar#initialize): ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26263 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2010-01-09 20:35:28 +00:00
parent b4da253400
commit 655cb34f17
2 changed files with 10 additions and 1 deletions
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2
lib/matrix.rb
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@ -569,7 +569,7 @@ class Matrix
#
# Returns the inverse of the matrix.
# Matrix[[1, 2], [2, 1]].inverse
# Matrix[[-1, -1], [0, -1]].inverse
# => -1 1
# 0 -1
#

9
test/matrix/test_matrix.rb
View file

@ -144,4 +144,13 @@ class TestMatrix < Test::Unit::TestCase
assert_equal 3, m.transpose.rank
end
end
def test_inverse
assert_equal(Matrix[[-1, 1], [0, -1]], Matrix[[-1, -1], [0, -1]].inverse)
end
def test_determinant
assert_equal(45, Matrix[[7,6], [3,9]].determinant)
assert_equal(-18, Matrix[[2,0,1],[0,-2,2],[1,2,3]].determinant)
end
end