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From: | Ben Abbott |
Subject: | Re: polyfit hangs on inf input |
Date: | Mon, 03 Nov 2008 16:59:14 -0500 |
On Nov 3, 2008, at 3:05 PM, Dmitri A. Sergatskov wrote:
On Mon, Nov 3, 2008 at 12:32 PM, Søren Hauberg <address@hidden> wrote:man, 03 11 2008 kl. 12:11 -0600, skrev Dmitri A. Sergatskov:The following code seems to hang octave 3.0.2 (on Fedora 9 x86_64): xx=linspace(-1,1,11); yy=2*linspace(-1,1,11); xx(6)=Inf; polyfit(xx',yy',1) The problem seems to be with underlying x\y code. I do not know WWMD in this case, but hanging does not seem to be appropriate. Either bailing out with an error, or ignoring with a warning seem to be better options.With 3.1.51+ I get octave:4> polyfit(xx',yy',1) ans = NaN NaNThis appears to be the (unintended?) result of the code: if (nargout > 2) ## Normalized the x values. mu = [mean(x), std(x)]; x = (x - mu(1)) / mu(2); endif (std(x) returns NaN if x has Infs) x\y would still hang. Anyone can check what would matlab do in either case?
Dmitri, your example has nargout == 0, are you sure std(x) is being run? Ben
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