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[Octave-bug-tracker] [bug #48616] Matlab compatibility for semilogx() an


From: Markus Mützel
Subject: [Octave-bug-tracker] [bug #48616] Matlab compatibility for semilogx() and xlim([0 uplim])
Date: Tue, 26 Jul 2016 08:06:43 +0000 (UTC)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:48.0) Gecko/20100101 Firefox/48.0

Follow-up Comment #9, bug #48616 (project octave):

The underlying difference seems to be deeper in Octave's graphics code than I
initially suspected. The following example also fails in Octave but works
flawlessly in Matlab:

x = 1.2:10.2;
y = 1:10;
clf;
hax = axes ();
hp = plot (x, y);
set (hax, 'XLim', [-Inf Inf]);


In Matlab, an "inf" limit seems to indicate a *tight* axis limit on that
border.

Octave does a similar thing when calling the higher level function xlim() with
"inf" limits: It manually sets the axis limit on that border that would be
used if "(XYZ)LimMode" was set to *auto*.

The attached changeset does the same for logplots with a "0" border. This
prevents the original example from throwing an error. And makes Octave behave
more self-consistently, I guess.

However, the underlying difference still persists. Maybe, keep this bug open
even if this changeset should be applied. Or open a new bug.

(file #38026)
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Additional Item Attachment:

File name: bug48616_log_lim0.patch        Size:1 KB


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  <http://savannah.gnu.org/bugs/?48616>

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