On Sat, Jan 29, 2011 at 10:11 PM, Algis Kabaila <akaba...@pcug.org.au>wrote:
> On Sunday 30 January 2011 09:10:30 Sturla Molden wrote: > > Den 29.01.2011 12:40, skrev Algis Kabaila: > > > So my question is: how can one reliably detect singularity > > > (or near singularity) and raise an exception? > > > > Use an SVD, examine the singular values. > I gather that SVD is the Singular Value Decomposition, but I > have no idea how to perform such decomposition. Would you care > to refer me to some simple source material? I have been advised > to watch the condition numbers. No doubt, SVD and condition > numbers are related. The references about condition numbers are > very interesting and I intend to follow them in the first > instance. > > Use numpy.linalg.svd. The condition number is the ratio of the largest singular value to the smallest. <snip> Chuck
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