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authormarcandre <marcandre@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-10-29 02:43:28 +0000
committermarcandre <marcandre@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-10-29 02:43:28 +0000
commit764524f65b1b27a0670c81e3605a9ac8e3385040 (patch)
tree011a4a07ad14dd9a4a23dea7b5f6c8e525c811b3 /lib/matrix.rb
parentdc38c877792287240f7ee37d6444da9801a21f57 (diff)
* lib/matrix.rb: Add Matrix#adjucate
patch by gogo tanaka [#10056] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48182 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'lib/matrix.rb')
-rw-r--r--lib/matrix.rb15
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/matrix.rb b/lib/matrix.rb
index cdaa55f..f7acd9f 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -62,6 +62,7 @@ end
# * #minor(*param)
# * #first_minor(row, column)
# * #cofactor(row, column)
+# * #adjugate
# * #laplace_expansion(row_or_column: num)
# * #cofactor_expansion(row_or_column: num)
#
@@ -690,6 +691,20 @@ class Matrix
end
#
+ # Returns the adjugate of the matrix.
+ #
+ # Matrix[ [7,6],[3,9] ].adjugate
+ # => 9 -6
+ # -3 7
+ #
+ def adjugate
+ Matrix.Raise ErrDimensionMismatch unless square?
+ Matrix.build(row_count, column_count) do |row, column|
+ cofactor(column, row)
+ end
+ end
+
+ #
# Returns the Laplace expansion along given row or column.
#
# Matrix[[7,6], [3,9]].laplace_expansion(column: 1)