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[Octave-bug-tracker] [bug #33503] null.m: tolerance for zero in basis el


From: Olaf Till
Subject: [Octave-bug-tracker] [bug #33503] null.m: tolerance for zero in basis elements
Date: Thu, 09 Jun 2011 20:24:04 +0000
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20110429 Iceweasel/3.5.16 (like Firefox/3.5.16)

Follow-up Comment #2, bug #33503 (project octave):

I'm not sure I know what you mean. Should I post the matrix whose null space
basis should contain a zero? Here it is:


octave:1> A = [269.5000000000000, 539.0000000000000, 71.4579813863544; 
539.0000000000000, 1078.0000000000000, 142.9159627727089; 
71.4579813863544, 142.9159627727089, 19.3551706649989];
octave:2> null (A)
ans =

  -8.94427190999911e-01
   4.47213595499968e-01
  -9.38693567320570e-14


The last element of ans should be zero.

To explain why I think it should be zero would be rather complicated.


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