# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'running_avg.1.png'
set border 3 front lt black linewidth 1.000 dashtype solid
set key fixed right center vertical Left reverse enhanced autotitle box lt black linewidth 1.000 dashtype solid
set key invert samplen 4 spacing 1 width 0 height 0
set style data linespoints
set xtics border in scale 1,0.5 nomirror norotate  autojustify
set ytics border in scale 1,0.5 nomirror norotate  autojustify
set title "Demonstrate use of assignment and serial evaluation operators\nto accumulate statistics as successive data lines are read in\n" 
set xrange [ 0.00000 : 57.0000 ] noreverse
samples(x) = $0 > 4 ? 5 : ($0+1)
avg5(x) = (shift5(x), (back1+back2+back3+back4+back5)/samples($0))
shift5(x) = (back5 = back4, back4 = back3, back3 = back2, back2 = back1, back1 = x)
init(x) = (back1 = back2 = back3 = back4 = back5 = sum = 0)
NO_ANIMATION = 1
back1 = 5.0
back2 = 9.0
back3 = 8.0
back4 = 9.0
back5 = 10.0
datafile = "silver.dat"
sum = 1918.0
## Last datafile plotted: "silver.dat"
plot sum = init(0),      datafile using 0:2 title 'data' lw 2 lc rgb 'forest-green',      '' using 0:(avg5($2)) title "running mean over previous 5 points" pt 7 ps 0.5 lw 1 lc rgb "blue",      '' using 0:(sum = sum + $2, sum/($0+1)) title "cumulative mean" pt 1 lw 1 lc rgb "dark-red"