compare_analytic.gpl
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			#!/usr/bin/gnuplot

			# compare sph/heatconduction output with analytic solution to diffusion equation

			alpha = 1.0e-4
			time = 4.0

			analytic_profile(x) = 1.5 + 0.5erf((x-49.5e-2)/sqrt(4.0alpha*time))

			set ylabel "internal energy per particle"
			set xlabel "x position [m]"

			plot [][0.5:2.5]'dump.last' u 3:6 ti "SPH simulation", analytic_profile(x) ti "analytic solution"

			pause -1
			#set terminal postscript color enhanced lw 2
			#set out "heat_profile.ps"
			set table "simu.dat"
			plot [0:1][0.5:2.5]'dump.last' u 3:6

			set table "analytic.dat"
			set samples 1000
			plot [0:1][0.5:2.5] analytic_profile(x)
			#replot

lammps/examples/USER/sph/heatconduction/compare_analytic.gpld1bbe9546c02lammm-devel