Re: heat map ?

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

And...is it possible to overlap over each cell the actual value ?
There is an example on the doc, but when I modify my gp to follow it, I get
this error:

"macrobench_latency_heat.gp", line 15: warning: matrix contains missing or
undefined values

plot "heatmap_latencies_handmade.txt" matrix rowheaders columnheaders u
1:2:3 with image pixels notitle, "heatmap_latencies_handmade.txt" matrix u
1:2:3 with label

                            ^
"macrobench_latency_heat.gp", line 15: unrecognized plot type


I've modified the gp as:

set term pdfcairo
set output "macrobench_latency_heat.pdf"
load "../styles.inc"
set size 0.9,0.65
set lmargin 19
set rmargin 1
load 'greys.pal'
set tic scale 0
set font "Arial,9pt"
set cblabel "Latency (ms)"
set datafile separator comma
plot\
 "heatmap_latencies_handmade.txt" matrix rowheaders columnheaders u 1:2:3
with image pixels notitle,\
 "heatmap_latencies_handmade.txt" matrix u 1:2:3 with label
quit

Gnuplot version is Version 5.0 patchlevel 1    last modified 2015-06-07

--
Valerio


On Fri, Apr 22, 2016 at 7:24 PM, Valerio Schiavoni <
val...@gm...> wrote:

> 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
>> > >
>>
>>
>