set zeroaxis
set xrange[-1:10]
set nokey
set title 'Grafico della funzione $\ln (x)$'
set xtics -1,1,10
set ytics -2.5,0.5,2.5
set arrow from 1,log(1) to 5, log(5) nohead
set label '$[x_1,f(x_1)]$' at 1,log(1)      
set label '$[x_2,f(x_2)]$' at 5,log(5)    
set xlabel '$x$'
set ylabel '$y$'
plot log(x)
set terminal latex
set output "c:\\uno.tex"