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* lib/matrix (minor): Also handle negative arguments like Array#[]

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cf [ruby-core:23598]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25450 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
marcandre 2009-10-24 06:04:41 +00:00
parent 5d6440c748
commit e5af8e940b
1 changed files with 18 additions and 5 deletions
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23
lib/matrix.rb
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@ -346,22 +346,35 @@ class Matrix
# => 9 0 0 # => 9 0 0
# 0 5 0 # 0 5 0
# #
# Like Array#[], negative indices count backward from the end of the
# row or column (-1 is the last element). Returns nil if the starting
# row or column is greater than row_size or column_size respectively.
#
def minor(*param) def minor(*param)
case param.size case param.size
when 2 when 2
from_row = param[0].first from_row = param[0].first
size_row = param[0].end - from_row from_row += row_size if from_row < 0
size_row += 1 unless param[0].exclude_end? to_row = param[0].end
to_row += row_size if to_row < 0
to_row += 1 unless param[0].exclude_end?
size_row = to_row - from_row
from_col = param[1].first from_col = param[1].first
size_col = param[1].end - from_col from_col += column_size if from_col < 0
size_col += 1 unless param[1].exclude_end? to_col = param[1].end
to_col += column_size if to_col < 0
to_col += 1 unless param[1].exclude_end?
size_col = to_col - from_col
when 4 when 4
from_row, size_row, from_col, size_col = param from_row, size_row, from_col, size_col = param
return nil if size_row < 0 || size_col < 0
from_row += row_size if from_row < 0
from_col += column_size if from_col < 0
else else
Matrix.Raise ArgumentError, param.inspect Matrix.Raise ArgumentError, param.inspect
end end
return nil if from_row > row_size || from_col > column_size return nil if from_row > row_size || from_col > column_size || from_row < 0 || from_col < 0
rows = @rows[from_row, size_row].collect{|row| rows = @rows[from_row, size_row].collect{|row|
row[from_col, size_col] row[from_col, size_col]
} }