diff options
| -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 |