set terminal png size 1000,1000
set output 'sparse_plot.png'

set logscale xy

set ylabel "Laufzeit in Sekunden"
set xlabel "Matrixgröße"

set format y "%g"

plot 'sparse.dat' title "SparseMatrix", \
     'dense.dat' title "DenseMatrix",\
     0.000000015*x**2 title "c x^2", \
     0.0000001*x title "b x"