gnuplot-info

[Gnuplot-info] Plotting heatmap + "warning: Number of pixels cannot be factored..." + data file seems correct (I.E. K*N matrix)

[julien.siebert <jul...@gm...>]

Dear all,

I am having trouble while plotting some heatmaps with the following
commands:

"set view map
splot 'myfile' matrix with image"

Where myfile is an ASCII file containing N lines and each lines containing K
floating point values.

It worked really well until I have the following error:
"warning: Number of pixels cannot be factored into integers matching grid. N
= 500500  K = 2000"

I understand the error, Gnuplot told me that it cannot read "myfile" as a
500500*2000 grid.
The problem is that "myfile" is actually 500500*500 grid. (really I check).

It seems to me that gnuplot is having trouble while determining K.
I don't know if it comes from the fact that I am using floating point values
(As I said it worked well before)?
I don't know if I can set these two values N and K by myself ?

Any idea?
Thanks,
Julien

--
gnuplot 4.6 patchlevel 0 (Gentoo revision r0)

Linux spencer 3.4.9-gentoo-r0-c2-v1 #3 SMP Mon Sep 10 15:29:08 CEST 2012
x86_64 Intel(R) Core(TM) i3 CPU 550 @ 3.20GHz GenuineIntel GNU/Linux



--
View this message in context: http://gnuplot.10905.n7.nabble.com/Plotting-heatmap-warning-Number-of-pixels-cannot-be-factored-data-file-seems-correct-I-E-K-N-matrix-tp17108.html
Sent from the Gnuplot - User mailing list archive at Nabble.com.

Re: [Gnuplot-info] Plotting heatmap + "warning: Number of pixels cannot be factored..." + data file seems correct (I.E. K*N matrix)

[walter h. <wh...@bf...>]

Am 12.02.2013 17:45, schrieb julien.siebert:
> Dear all,
> 
> I am having trouble while plotting some heatmaps with the following
> commands:
> 
> "set view map
> splot 'myfile' matrix with image"
> 
> Where myfile is an ASCII file containing N lines and each lines containing K
> floating point values.
> 
> It worked really well until I have the following error:
> "warning: Number of pixels cannot be factored into integers matching grid. N
> = 500500  K = 2000"
> 
> I understand the error, Gnuplot told me that it cannot read "myfile" as a
> 500500*2000 grid.
> The problem is that "myfile" is actually 500500*500 grid. (really I check).
> 
> It seems to me that gnuplot is having trouble while determining K.
> I don't know if it comes from the fact that I am using floating point values
> (As I said it worked well before)?
> I don't know if I can set these two values N and K by myself ?
> 
> Any idea?
> Thanks,
> Julien
> 

Hi, Julien,
i also use heatmaps very often (but more 800x500)
i tend to ingnore the errors they are most times
caused by a missing value.

re,
 wh


> --
> gnuplot 4.6 patchlevel 0 (Gentoo revision r0)
> 
> Linux spencer 3.4.9-gentoo-r0-c2-v1 #3 SMP Mon Sep 10 15:29:08 CEST 2012
> x86_64 Intel(R) Core(TM) i3 CPU 550 @ 3.20GHz GenuineIntel GNU/Linux
> 
> 
> 

Re: [Gnuplot-info] Plotting heatmap + "warning: Number of pixels cannot be factored..." + data file seems correct (I.E. K*N matrix)

[julien.siebert <jul...@gm...>]

Hi Walter, Hi Hans-Bernhard


Hans-Bernhard Bröker wrote
> That's no error.  It's a _warning_.  It even says so on the tin.

Ok, my mistake, it is a warning :)


However with terminal wxt I have no plot at all.
I switched to terminal pdf and I got my plot.


By the way,

walter harms wrote
> Hi, Julien,
> i also use heatmaps very often (but more 800x500)
> i tend to ignore the errors they are most times
> caused by a missing value.

I did not find any missing value. I have checked my data file, used other
data sets with different size of grids and each time it seems that gnuplot
is not finding the right K (N is ok).

I have no clue how to solve this warning.
But now I have my plots :)

Regards,

Julien




--
View this message in context: http://gnuplot.10905.n7.nabble.com/Plotting-heatmap-warning-Number-of-pixels-cannot-be-factored-data-file-seems-correct-I-E-K-N-matrix-tp17108p17112.html
Sent from the Gnuplot - User mailing list archive at Nabble.com.