heat map ?

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

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 ?

Thanks !
--
Valerio