Re: heat map ?

[Valerio S. <val...@gm...>]

The "pixels" keyword did it ! Awesome :-)

--
Valerio


On Fri, Apr 22, 2016 at 7:11 PM, Ethan A Merritt <
sf...@us...> wrote:

> On Friday, 22 April, 2016 18:43:10 Valerio Schiavoni wrote:
> > Help everyone,
> > following Ethan advice, i've tried to simply the .gp file. Now it looks
> > like this:
> >
> > set term pdfcairo
> > set output "macrobench_latency_heat.pdf"
> > load "../styles.inc"
> > set size 0.9,1.0
> > set lmargin 20
> > set rmargin 20
> > set palette defined (0.0 "white", 1.0 "blue")
> > set tic scale 0
> > set cblabel "Latency (ms)"
> > set datafile separator comma
> > plot\
> >  "heatmap_latencies_handmade.txt" matrix rowheaders columnheaders u 1:2:3
> > with image notable
> >
> > Now, how do I show you the result ? I've uploaded it here
> > http://postimg.org/image/sssos6q9j/full/
> > but here, it shows it something that is completely different from the PDF
> > that I see, in which the cells are smoothed/interpolated...for some
> reason..
> >
> > Ideas?
>
> The smoothing is probably happening in the program that you use to
> view the pdf file.
>
> Try adding the keyword "pixels":
>
>      plot ... with image pixels
>
> That will change the gnuplot output such that the viewer program
> will probably not recognize it as something that can be smoothed.
> See for example the 5th plot in this set of examples
>
>      http://gnuplot.sourceforge.net/demo_svg_5.1/heatmaps.html
>
>         Ethan
>
> >
> > --
> > Valerio
> >
> >
> > On Fri, Apr 22, 2016 at 5:50 PM, sfeam <sf...@us...>
> wrote:
> >
> > > On Friday, 22 April 2016 09:46:50 AM Valerio Schiavoni wrote:
> > > > Hello,
> > > > i've been trying to make an heat map that looks like the one in this
> blog
> > > > entry
> > > >
> https://learnr.wordpress.com/2010/01/26/ggplot2-quick-heatmap-plotting/
> > > > Unfortunately they don't use gnuplot.
> > > >
> > > > My attempt so far produces a poor result, i think because I'm not
> using
> > > the
> > > > right approach.
> > > >
> > > > Here's my current version:
> > > >
> > > > set term pdfcairo
> > > > set output "latency_heat.pdf"
> > > > load "../styles.inc"
> > > > set size 0.9,1.0
> > > > set lmargin 15
> > > > set rmargin 20
> > > > set pm3d #interpolate 0,100
> > > > set view map scale 1
> > > > set style func pm3d
> > > > set style data pm3d;
> > > > set dgrid3d
> > > > set pal defined ( 0 0 0 0, 1 1 1 1 )
> > > > set tic scale 0
> > > > set cblabel "Latency (ms)"
> > > > set datafile separator comma
> > > > splot "heatmap_latencies.txt" matrix rowheaders columnheaders using
> 1:2:3
> > > > with image title ""
> > > >
> > > > Where the input file is:
> > > >
> > > > ,One,Two,Three
> > > > a,675.0, 1177.0, 1975.0
> > > > b,744.0, 13908.0, 20191.0
> > > > c,1767.0, 4374.0  ,5165.0
> > > > d,678.0, 1101.0  ,1888.0
> > > > e, 771.0, 13842.0 ,18648.0
> > > > f, 1372.0, 4264.0  ,5187.0
> > > > g,753.0 , 1541.0  ,1729.0
> > > > h,791.0 , 5832.0  ,20528.0
> > > > i,1310.0, 1225.0  ,5436.0
> > > > l,747.0,  1516.0  ,2118.0
> > > > m,825.0 , 16719.0 ,0
> > > > n,1341.0, 4427.0 ,9040.0
> > > >
> > > >
> > > > Any idea on how to improve this ?
> > >
> > > Most of those commands are irrelevant to what you want.
> > > This is not a 3D surface, so you don't need "splot".
> > > The colors are categorical, not smoothed, so you don't want pm3d.
> > > Disregarding labels, it is sufficient to say
> > >
> > >   set datafile separator comma
> > >   set palette defined (0.0 "white", 1.0 "blue")
> > >   plot "heatmap_latencies.txt" matrix rowheaders columnheaders with
> image
> > >
> > >
> > >         Ethan
> > >
>
>