pcolor and "interp" [changeset-2]

[Jaroslav Hajek]

On Fri, Oct 3, 2008 at 1:33 PM, Ben Abbott <bpabbott at mac.com> wrote:
>
> On Oct 2, 2008, at 3:24 PM, Ben Abbott wrote:
>
>> On Thursday, October 02, 2008, at 12:50PM, "John W. Eaton" <jwe at bevo.che.wisc.edu
>> > wrote:
>>> On  2-Oct-2008, Ben Abbott wrote:
>>>
>>> | Trying again. This time with the facecolor bug reported by Michael
>>> | included.
>>>
>>> OK, I thought I had made the change, checked it in, and pushed it,
>>> but
>>> I must have forgotten to push.  In any case, your latest changes
>>> should be in the public archive now.
>>>
>>> Now I see that for something like
>>>
>>> pcolor (peaks ())
>>> shading interp
>>>
>>> I get an all green plot.  I'm using gnuplot 4.2.2.  I assumed that it
>>> would just fail to do the interpolation, but now the plot changes to
>>> something completely wrong.  I'm a bit surprised by that as I thought
>>> the previous behavior was that "shading interp" simply had no effect.
>>>
>>
>> This due to an improper zrange being specified. If you save the
>> gnuplot commands and remove the zrange line it should work properly.
>>
>> To me honest, I was worried about that, but when I tested it
>> (switching between a standard gnuplot 4.2.3 and one patched for
>> interpolate colors) ... all went well. I doubt the difference is
>> that I'm running 4.2.3. It is more likely I did the testing wrong.
>>
>> Ben
>
> I've rebuilt octave from the developers sources last night and
> installed two gnuplot binaries which I switch between using
> gnuplot_binary().
>
> For me the unpatched gnuplot 4.2.3 and octave 3.1.51+ produce surface
> plots as seen with octave 3.0.2 and gnuplot 4.2.3. While the patched
> gnuplot 4.2.3+ and octave 3.1.51+ now properly interpolate colors.
>
> I've attached a "debug.gp" file created with the commands below while
> running octave 3.1.51+ with the unpatched gnuplot 4.2.3.
>
>        octave-3.1.51+:1> gnuplot_binary
>        ans = gnuplot
>        octave-3.1.51+:2> pcolor(peaks());
>        octave-3.1.51+:3> shading interp; drawnow ("x11", "/dev/null", false,
> "debug.gp")
>
> I'd be interested in hearing what others see rendered when they type
>
>        $ gnuplot -persist debug.gp
>
> I'm especially interested in the results from gnuplot 4.2.2, and 4.2.4.
>
> Ben
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>


Hi,

Im not sure about this, so I'll better ask: Should any of these
patches go into 3-0-x (for 3.0.4)? If yes, which ones?

thanks,


-- 
RNDr. Jaroslav Hajek
computing expert
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz