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From: | Carnë Draug |
Subject: | [Octave-bug-tracker] [bug #39314] convn(x, y, "valid") produces results that are different from Matlab |
Date: | Mon, 21 Oct 2013 13:22:24 +0000 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130917 Firefox/17.0 Iceweasel/17.0.9 |
Follow-up Comment #12, bug #39314 (project octave): I think the cause of the different values comes from the order the values are added. Looking at the code for inner convolution and comparing to other, it seems that it's being done in reverse order so machine precision errors get in. Kind of like in the following example: octave> a = rand (1, 27); octave> b = rand (1, 27); octave> c1 = sum (a .* b); octave> c2 = sum (a(end:-1:1) .* b(end:-1:1)); octave> c1 - c2 ans = 1.7764e-15 -verbatim _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?39314> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/
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