Semilogy and zeros

[John W. Eaton]

Jaroslav, if you plan another 3.2.x release, the patch mentioned below
should probably be applied.

Thanks,

jwe

On 23-Jul-2009, Marco Caliari wrote:

| Dear John,
| 
| your patch was not applied to Octave 3.2.2.
| 
| Best regards,
| 
| Marco
| 
| On Thu, 16 Jul 2009, John W. Eaton wrote:
| 
| > On 16-Jul-2009, Ben Abbott wrote:
| >
| > | On Jul 16, 2009, at 6:42 AM, Marco Caliari wrote:
| > |
| > | > Dear maintainers,
| > | >
| > | > the following command
| > | >
| > | > semilogy([1e-16,0],'*')
| > | >
| > | > produces the warning
| > | > warning: axis: omitting nonpositive data in log plot
| > | >
| > | > and the corresponding plot in Octave 3.0.5, but an empty plot in
| > | > Octave 3.2.0. I think the old behaviour is the right one. I'm using
| > | > Gnuplot 4.2.5.
| > | >
| > | > Best regards,
| > | >
| > | > Marco
| > |
| > | I don't see this warning in the m-file sources.
| >
| > It comes from a function in graphics.cc.
| >
| > | However, I have reproduced Marco's examples.
| >
| > I checked in the following change.  It seems to fix the problem for
| > me.
| >
| >  http://hg.savannah.gnu.org/hgweb/octave/rev/ac2617d4e30c
| >
| > Note that the axis calcuation for log scale plots is still not quite
| > right when we have to discard negative data.  Currently, for example,
| > we discard the data for plotting, but we compute the axis limits
| > independently, on the full data.  Instead, I think we need to discard
| > the skipped data, then compute the axis limits.  But this seems like a
| > minor point, and will also require some significant restructuring, so
| > I have no plans to fix it.  However, I would consider a patch.
| >
| > jwe
| >
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