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[Octave-bug-tracker] [bug #57185] eigs does not consistently order eigen

From: Rik
Subject: [Octave-bug-tracker] [bug #57185] eigs does not consistently order eigenvalues
Date: Thu, 14 Nov 2019 21:04:40 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko

Follow-up Comment #16, bug #57185 (project octave):

Seems like another addition for Matlab compatibility will be to map new
options for the type of eigenvalues to return to their old two-letter codes
based on symmetry and real/complex nature of input.

sigma                      Description                                   
sigma (R2017a and earlier)

scalar (real or complex)   The eigenvalues closest to the number sigma.   No

'largestabs' (default)     Largest magnitude.                             'lm'

'smallestabs'              Smallest magnitude. Same as sigma = 0.        

'largestreal'              Largest real.                                 
'lr', 'la'

'smallestreal'             Smallest real.                                
'sr', 'sa'

'bothendsreal'             Both ends, with k/2 values with largest and   
                           smallest real part respectively
                           (one more from high end if k is odd).


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