#// gnuplot script for ploting the data

set title "Time taken to access a two-dimensional array of size w^2 bytes"
set xlabel "Array width, w (bytes), width = height, total size = width^2"
set ylabel "Time, t (seconds)"
set autoscale

set terminal png enhanced font 'arial,12' size 600, 600
set output "plot.png"

set xtic 256
set ytic  0.5
set xrange [0:2600]
set yrange [0:8.5]
set grid xtics ytics

set key left top
set key spacing 2.5

set style line 1 lt 1 lw 1 linecolor rgb "black"
set style line 2 lt 3
set style line 3 lt 3
set key box linestyle 1


xfirst_fit(x) = k0 * (x**2)
fit xfirst_fit(x) "xfirst_char.txt" using 1:3 via k0

plot \
    "xfirst_char.txt" using 1:3 \
        title "Access by x, then by y" with lines linewidth 2, \
    "yfirst_char.txt" using 1:3 \
        title "Access by y, then by x" with lines linewidth 2, \
    xfirst_fit(x) title "Best Fit: by x, then by y" with lines linewidth 2