Une collection de notes diverses sur des trucs et astuces pour faire des choses avec un ordinateur...
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%
% nouveau 27 septembre 2020
%
\chapter{Gnuplot}
\index{Gnuplot}\label{chap:gnuplot}
\section{Exemple : le phytotron}
\index{phytotron}
\begin{verbatim}
#!/bin/bash
# THIS IS A KLUDGE
nbsamp=3000 # nombre d'echantillon
if [ $# -eq 1 ]; then
nbsamp=$1
fi
DATAFILE="serial/foo.dat"
IMAGE="graphe.png"
TMPFILE="/dev/shm/tmpdata"
echo $nbsamp
wc -l ${DATAFILE}
tail -${nbsamp} < ${DATAFILE} > ${TMPFILE}
gnuplot << __EOC__
set term png size 1600,800
set output "${IMAGE}"
set ytics 2
set xtics
set grid front
set title "* Temperatures du Phytotron *"
set xdata time
set timefmt "%s"
set format x "%b %d\n%H:%M"
set yrange [ 10.0 : 40.0 ]
plot "${TMPFILE}" using 1:3 title " inside" with lines, \
"${TMPFILE}" using 1:4 title "ambient" with lines
__EOC__
display ${IMAGE} &
\end{verbatim}