# lotka_commands.txt
#
# Usage:
#  gnuplot < lotka_commands.txt
#
set term png
set output 'lotka.png'
set xlabel '<-- Predator -->'
set ylabel '<-- Prey -->'
set title 'predator prey: midpoint method'
set grid
set style data lines
plot 'lotka_data.txt' using 2:3 with lines lw 3
quit