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

[Rik]

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
change

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


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

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

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

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




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