#! /opt/bin/dash

export GDFONTPATH="/usr/share/fonts/open-sans"
export GNUPLOT_DEFAULT_GDFONT="OpenSans-Semibold"

title="Grover's Search, 2**16"
xlabel="Number of iterations"
ylabel="Average Entanglement"
labels="set title \"$title\"\nset xlabel \"$xlabel\"\nset ylabel \"$ylabel\""

# input from: ./Grover -dpE 16 300 | sed '1,/^iter/d' | egrep '^E'
# example:
# E: 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067 0.000122067
# two lines per Grover iteration
# average every other line
#
awk 'BEGIN { n=0; E=0; print "0"; } {
  n = !n; if(n) next;
  a = 0; for( i = 2; i <= NF; ++i) a += $i;
  print a/(NF-1);
}' Grover-E.txt |
 (printf "set term gif\nset output\n $labels\n plot '-' notitle with linespoints\n"; cat) |
   gnuplot > Grover-E.gif