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Subject: Contradictory Rank
Date: Wed, 21 Mar 2012 02:38:37 +0000 (UTC)
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I have a diagonal matrix with values -3.4562e-14, 15.2673,  86.9550, 1.4873e+03. Matlab says that its rank is 3 and rref indicates the same. Why is this, and how can I figure out what's really going on?