gnuplot-info

[Gnuplot-info] with image error msg: "Number of pixels cannot be factored"

[Philipp K. J. <ja...@ie...>]

When trying to plot the following file:

1	1	1
1	2	2
2	1	3
2	2	4
3	3	1
3	1	0
3	2	0
1	3	0
2	3	0

using 

plot "file" u 1:2:3 w imag

I received the following warning message:
        warning: Number of pixels cannot be factored into integers
	matching grid. N = 9  K = 2 

The plot showed just the borders and the
colorbox, but none of my data.

What am I doing wrong? And what's the 
meaning of the quantities N and K in
the error msg? (I don't seem to find 
any info in the docs about them.)

Thanks!

Best,

		Ph.

Re: [Gnuplot-info] with image error msg: "Number of pixels cannot be factored"

[Ethan M. <eam...@gm...>]

On Tue, Sep 23, 2014 at 2:45 PM, Philipp K. Janert <ja...@ie...> wrote:
>
> When trying to plot the following file:
>
> 1       1       1
> 1       2       2
> 2       1       3
> 2       2       4
> 3       3       1
> 3       1       0
> 3       2       0
> 1       3       0
> 2       3       0
>
> using
>
> plot "file" u 1:2:3 w imag
>
> I received the following warning message:
>         warning: Number of pixels cannot be factored into integers
>         matching grid. N = 9  K = 2
>
> The plot showed just the borders and the
> colorbox, but none of my data.
>
> What am I doing wrong?

Please see
    http://gnuplot.sourceforge.net/demo/heatmaps.html

Re: [Gnuplot-info] with image error msg: "Number of pixels cannot be factored"

[Philipp K. J. <ja...@ie...>]

On Tue, 23 Sep 2014 15:13:20 -0700
Ethan Merritt <eam...@gm...> wrote:

What I infer from that demo is that one needs 
to choose one of two (text) file formats:
- matrix format (w/o explicit coordinates)
- the "old style" splot format, with scan
  lines separated by blank lines.

I had actually hoped that the image format 
would allow me to randomly address individual 
"pixels" by their coordinates. Is that not
so?

Best,

		Ph.



> On Tue, Sep 23, 2014 at 2:45 PM, Philipp K. Janert <ja...@ie...>
> wrote:
> >
> > When trying to plot the following file:
> >
> > 1       1       1
> > 1       2       2
> > 2       1       3
> > 2       2       4
> > 3       3       1
> > 3       1       0
> > 3       2       0
> > 1       3       0
> > 2       3       0
> >
> > using
> >
> > plot "file" u 1:2:3 w imag
> >
> > I received the following warning message:
> >         warning: Number of pixels cannot be factored into integers
> >         matching grid. N = 9  K = 2
> >
> > The plot showed just the borders and the
> > colorbox, but none of my data.
> >
> > What am I doing wrong?
> 
> Please see
>     http://gnuplot.sourceforge.net/demo/heatmaps.html

Re: [Gnuplot-info] with image error msg: "Number of pixels cannot be factored"

[Ethan M. <eam...@gm...>]

On Tue, Sep 23, 2014 at 3:27 PM, Philipp K. Janert <ja...@ie...> wrote:
> On Tue, 23 Sep 2014 15:13:20 -0700
> Ethan Merritt <eam...@gm...> wrote:
>
> What I infer from that demo is that one needs
> to choose one of two (text) file formats:
> - matrix format (w/o explicit coordinates)
> - the "old style" splot format, with scan lines separated by blank lines.
>
> I had actually hoped that the image format
> would allow me to randomly address individual
> "pixels" by their coordinates. Is that not so?

I don't understand the question.
What do you mean by "randomly address"?

You want to fill in the pixels of an image in random order?  That
sounds pretty far from anything gnuplot tries to handle.   Why random
order?

       Ethan

> Best,
>
>                 Ph.
>
>
>
>> On Tue, Sep 23, 2014 at 2:45 PM, Philipp K. Janert <ja...@ie...>
>> wrote:
>> >
>> > When trying to plot the following file:
>> >
>> > 1       1       1
>> > 1       2       2
>> > 2       1       3
>> > 2       2       4
>> > 3       3       1
>> > 3       1       0
>> > 3       2       0
>> > 1       3       0
>> > 2       3       0
>> >
>> > using
>> >
>> > plot "file" u 1:2:3 w imag
>> >
>> > I received the following warning message:
>> >         warning: Number of pixels cannot be factored into integers
>> >         matching grid. N = 9  K = 2
>> >
>> > The plot showed just the borders and the
>> > colorbox, but none of my data.
>> >
>> > What am I doing wrong?
>>
>> Please see
>>     http://gnuplot.sourceforge.net/demo/heatmaps.html
>
>
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