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Newsgroups: comp.graphics.apps.gnuplot
Date: Fri, 29 Sep 2017 02:18:25 -0700 (PDT)
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Subject: Re: pdfcairo/pngcairo file size limitations?
From: schwarz.cd48@gmail.com
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Xref: csiph.com comp.graphics.apps.gnuplot:3760

Am Donnerstag, 28. September 2017 22:47:47 UTC+2 schrieb Karl Ratzsch:
> Am 28.09.2017 um 15:07 schrieb schwarz.cd48@gmail.com:
> > gnuplot version 5.0 patchlevel 0
>=20
> > I am trying to make a matrix plot of a file that is made up of 48 colum=
ns and 50000 lines. Each column contains integers between 0 - 140. I also w=
ant to produce a pdf in the end. The script for the plot looks like=20
>=20
> >     plot 'data.file' u 1:2:3 matrix wi image
> >=20
> > The problem is that in the output.pdf the plot area/canvas is empty and=
 only the xtics, ytics, and cbtics are shown. If I open gnuplot in the term=
inal and just do the plot in the standard qt terminal I will see the plot n=
ormally as expected, but it won't be produced in the pdf. The same goes for=
 the pngcairo terminal. On the other hand, if I use=20
> >=20
> >     set terminal postscript eps enhanced
> >=20
> > then the output.eps will contain the plot with no problems and I can co=
nvert eps to pdf.
> >=20
> > But why does the pdfcairo/pngcairo not work?
> >=20
> > I also found that if I reduce the number of lines in my 'data.file' fro=
m 50000 to 30000 (cutting off 2/5 of my data), then I will get a normal plo=
t in my output.pdf. If I increase it again to 40000, the canvas will again =
be empty again. Does pdfcairo have some limitations here?
>=20
>=20
> Yes, there is a problem. The following script produces a dataset
> like yours and works on qt and windows terminal, crashes wxt, and
> leaves an empty canvas with pdfcairo. (Tested on gp5.2pl0)
>=20
>=20
> t=3Dtime(0)
> n=3D40000
> m=3D48
> set print $dat;do for [i=3D1:n] {
>   s=3D""
>   do for [j=3D1:m] {s=3Ds.sprintf(" %.2f",rand(0.))}
>   if (i%1000=3D=3D0) {set print; print i." of ".n;set print $dat append}
>   print s}
> set print
> print time(0)-t
>=20
> plot $dat us 1:2:3 matrix w image

I guess I report it as a bug then