diff options
| author | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2010-01-09 20:35:28 +0000 |
|---|---|---|
| committer | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2010-01-09 20:35:28 +0000 |
| commit | 655cb34f17c2dc4b84aaf3fa99cceabb830138b8 (patch) | |
| tree | b004e74904c0e02274761fd533d472d6a4898861 | |
| parent | b4da2534005f65087ddd0607963fdb4dbc71ce61 (diff) | |
| download | ruby-655cb34f17c2dc4b84aaf3fa99cceabb830138b8.tar.gz | |
* lib/matrix.rb (Matrix#inverse_from): use #quo. backported r9490.
* 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
| -rw-r--r-- | lib/matrix.rb | 2 | ||||
| -rw-r--r-- | test/matrix/test_matrix.rb | 9 |
2 files changed, 10 insertions, 1 deletions
diff --git a/lib/matrix.rb b/lib/matrix.rb index e0095e929e..222bf4b698 100644 --- a/lib/matrix.rb +++ b/lib/matrix.rb @@ -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 # diff --git a/test/matrix/test_matrix.rb b/test/matrix/test_matrix.rb index 8e0848de01..6b9b587c6d 100644 --- a/test/matrix/test_matrix.rb +++ b/test/matrix/test_matrix.rb @@ -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 |