Bluebit Software Support Forum / Technical Support and Help / Online Matrix Calculator / Illegal values for Invertible Matix / Latest PostsInstantForum.NET v4.1.4Bluebit Software Support Forumhttp://www.bluebit.gr/forum/support@bluebit.grWed, 08 Feb 2012 18:04:38 GMT20RE: Illegal values for Invertible Matixhttp://www.bluebit.gr/forum/Topic542-9-1.aspxIf you try this in your computer:</P><P>1.0 - ( 1.0 / 3.0) - (2.0 / 3.0 ) </P><P>you won't get 0 as expected. It is the same reason that causes this behavior in the calculator. </P><P>We could of course use rounding in order to avoid it but then it would return erroneous results for near singular matrices.Thu, 30 Apr 2009 13:46:15 GMTTrifonIllegal values for Invertible Matixhttp://www.bluebit.gr/forum/Topic542-9-1.aspxThis is the matrix I'm speaking of:</P><P>1 1 5<BR>1 2 7<BR>2 -1 4</P><P>Your online calculator doesn't seem to understand that this is an invertible matrix, why is that?Wed, 29 Apr 2009 18:22:22 GMTlionheart1983