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[Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matri

From: Michael Godfrey
Subject: [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A
Date: Fri, 02 Oct 2015 23:34:40 +0000
User-agent: Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2522.1 Safari/537.36 
Follow-up Comment #12, bug #46103 (project octave):

Some Matlab 2015a results:


>> x = sparse (diag ([1 0]))

x =

   (1,1)        1

>> y = inv (x)
Warning: Matrix is singular to working precision. 

y =

   (1,1)        1
   (2,1)      NaN
   (2,2)      Inf

>> inv (diag (0:2))
Warning: Matrix is singular to working precision. 

ans =

   Inf   Inf   Inf
   Inf   Inf   Inf
   Inf   Inf   Inf

>> 



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