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diagnosing short rank matrices

From: Heber Farnsworth
Subject: diagnosing short rank matrices
Date: Fri, 1 Aug 2003 19:07:22 -0500

Here is something I occasionally need to do. I have to figure out why a matrix is less than full rank. I have seen other packages (like SAS) which will tell you which columns are nearly a linear combination of which other columns. That's a good trick and I've never figured out how to do it. Does anyone know?


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