#!/bin/bash
# Graph animation of input data

# Prepare separate frames
# For each frame
for (( i=1; i<=900; i++ ))
do
   echo "set terminal png;
         set output '$( printf %03d $i ).png';
         set format x '';
         plot [0:100][90:110] \
              '<sed -n $i,$((100+i))p data' \
              with boxes t'$i-$((100+i))';
         " | gnuplot
done

# Join frames into animation
ffmpeg -i %03d.png anim.mp4

# Cleanup
rm *.png