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Re: rgbplot composite fails with gnuplot
From: |
Juan Pablo Carbajal |
Subject: |
Re: rgbplot composite fails with gnuplot |
Date: |
Tue, 16 Dec 2014 16:25:49 +0100 |
On Tue, Dec 16, 2014 at 3:31 PM, Ben Abbott <address@hidden> wrote:
>> On Dec 16, 2014, at 8:26 AM, Juan Pablo Carbajal <address@hidden> wrote:
>>
>> Tested in 4.1.0+
>> repo id 19402:5cd83b466a3e
>>
>> octave-cli:1> rgbplot(jet(16),'composite')
>>
>> multiplot> plot "-" binary array=16x2 scan=yx origin=(1,1) dx=1 dy=0
>> using 1 title "" with image; ;
>> ^
>> line 0: Sample period must be positive. Try `flip` for
>> changing direction
>>
>>
>> Can anybody reproduce?
>>
>> Do we report bugs that involve gnuplot?
>>
>
> I get the same result using gnuplot 4.6 patchlevel 6.
>
> The error is indicating that dy must be greater than 0. The m-code which
> produces this gnuplot command is in plot/utils/private/__go_draw_axes__.m at
> lines 554-547.
>
> titlespec{data_idx} = "title \"\"";
> usingclause{data_idx} = sprintf ("binary array=%dx%d scan=yx
> origin=(%.15g,%.15g) dx=%.15g dy=%.15g using %s",
> x_dim, y_dim, x_origin, y_origin, dx, dy, format);
> withclause{data_idx} = sprintf ("with %s;", imagetype);
>
> The image intended looks a similar to a colorbar, so I expect the problem is
> on Octave's end.
>
> Ben
Ben,
Ok, thanks. I spotted the problem.
It happens when when the data of the image has a single row.
That is this fails as well
image (1:8)
The issue comes in lines 513 and 527-529 of __go_draw_axes__.m
When dy=0 because the ydata of the image is [1 1]
What are the "dx" and "dy" option for plot in gnuplot? I can't find a
reference. Knowing that we jnow how to fix the issue.
- rgbplot composite fails with gnuplot, Juan Pablo Carbajal, 2014/12/16
- Re: rgbplot composite fails with gnuplot, Ben Abbott, 2014/12/16
- Re: rgbplot composite fails with gnuplot,
Juan Pablo Carbajal <=
- Re: rgbplot composite fails with gnuplot, Juan Pablo Carbajal, 2014/12/16
- Re: rgbplot composite fails with gnuplot, Juan Pablo Carbajal, 2014/12/16
- Message not available
- Re: rgbplot composite fails with gnuplot, Juan Pablo Carbajal, 2014/12/16
- Re: rgbplot composite fails with gnuplot, Juan Pablo Carbajal, 2014/12/16
- Message not available
- Re: rgbplot composite fails with gnuplot, Juan Pablo Carbajal, 2014/12/16