draemonash2のメモ書き
gnuplot << EOF
set terminal png noenhanced
set output "test.png"
set ylabel 'execution time [s]'
set xlabel 'ros time'
set key font"Arial,9"
set noxtics
plot \
"< cat plotdata_aaa.log" w l title "aaa"
"< cat plotdata_bbb.log" w l title "bbb"
"< cat plotdata_ccc.log" w l title "ccc"
"< cat plotdata_ddd.log" w l title "ddd"
EOF