core function polyeig

[fotios]

This is a core function in M2012a and if i m not wrong it does the same 
thing with the attached one. Someone able to check that? Note that i do 
not like the way i do the error check in that function. So if anyone has 
just a bit of time improve it.

condeig is another nice function relatively easy to implement (see "On 
estimating the condition of eigenvalues and eigenvectors" by C.V.Loan). 
I might do that myself as an Octave function.

/Fotis

polyeig.m
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