Bug #2770: Matrix: determinant for rectangular matrices should raise an error [patch]

• Status: Closed
• Assignee: marcandre (Marc-Andre Lafortune)
• Target version: 1.9.2
• ruby -v: ruby 1.9.2dev (2010-01-13 trunk 26316) [x86_64-darwin10.2.0]

[marcandre (Marc-Andre Lafortune)]

=begin
Keiju,

$ rubydev -r matrix -e "puts Matrix[[1], [2], [3]].determinant"
0

This corresponds to the documentation, but is not mathematically valid, since the determinant for rectangular matrices is not defined (at least for now! http://bit.ly/bwW7Gs )

I believe an error should be thrown, similar to:
$ rubydev -r matrix -e "puts Matrix[[1], [2], [3]].trace"
/usr/local/rubydev/lib/ruby/1.9.1/matrix.rb:837:in trace': Matrix dimension mismatch (ExceptionForMatrix::ErrDimensionMismatch) from -e:1:in '

Since this is an API change, I attached a patch and will wait for your approval before committing.
=end

[marcandre (Marc-Andre Lafortune)]

• Category set to lib
• Assignee changed from keiju (Keiju Ishitsuka) to marcandre (Marc-Andre Lafortune)
• Target version set to 1.9.2

=begin

=end

[marcandre (Marc-Andre Lafortune)]

• Status changed from Assigned to Closed
• % Done changed from 0 to 100

=begin
This issue was solved with changeset r27160.
Marc-Andre, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

=end