From octave-maintainers-request at bevo dot che dot wisc dot edu  Mon Aug 21 02:19:03 2000
Subject: Re: proper lvalues and whatnot
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: "Ross A. Lippert" <ripper at cs dot sandia dot gov>
Cc: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>,         "octave-maintainers@bevo.che.wisc.edu"   <octave-maintainers@bevo.che.wisc.edu>
Date: Mon, 21 Aug 2000 02:17:03 -0500 (CDT)

On 18-Aug-2000, Ross A. Lippert <ripper at cs dot sandia dot gov> wrote:

| To me, and maybe not to anyone else, what seems mmore logical is
| v(I) += x(I) should be implemented as
| for i=1:length(I), v(I(i)) += x(I(i)); end

That might be nice in some instances, but I think Octave must behave
as though

  a(idx) += b

and

  a(idx) = a(idx) + b

are equivalent.  I'm afraid that the behavior of the second statement
is not equivalent to your loop if idx has repeated values.

jwe