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%	nouveau 27 septembre 2020
%
\chapter{Gnuplot}
\index{Gnuplot}\label{chap:gnuplot}

Gnuplot - an interactive plotting program

\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}




