units		real	
atom_style	full

read_data	data.spce

pair_style	lj/cut/coul/long 12.0 12.0
kspace_style	pppm 1.0e-4

pair_coeff	1 1 0.15535 3.166
pair_coeff	* 2 0.0000 0.0000	

bond_style	harmonic
angle_style	harmonic
dihedral_style	none
improper_style	none

bond_coeff	1 1000.00 1.000
angle_coeff	1 100.0 109.47

special_bonds   lj/coul 0.0 0.0 1.0

neighbor        2.0 bin

fix		1 all shake 0.0001 20 0 b 1 a 1
fix		2 all nvt temp 300.0 300.0 100.0

# make certain that shake constraints are satisfied
run 0 post no

group		one molecule 1 2

# the following section shows equivalences between using the stress/tally compute and other computes and thermo keywords

# compute per atom stress contributions
compute		spa all stress/atom NULL pair
compute		press all pressure NULL pair
# compute stress contributions from one group with all
compute		c1 one stress/tally all
# collect stress contributions from all with all
compute		c2 all stress/tally all
compute		one one reduce sum c_c1[1] c_c1[2] c_c1[3] c_spa[1] c_spa[2] c_spa[3]
compute		red all reduce sum c_spa[1] c_spa[2] c_spa[3] c_c2[1] c_c2[2] c_c2[3]
#
variable	spa equal -(c_red[1]+c_red[2]+c_red[3])/(3.0*vol)
variable	press equal -(c_red[4]+c_red[5]+c_red[6])/(3.0*vol)
variable	one equal (c_one[1]+c_one[2]+c_one[3])/3.0 
variable	ref equal (c_one[4]+c_one[5]+c_one[6])/3.0

#velocity	all create 300 432567 dist uniform

timestep	2.0

thermo_style    custom step c_press v_spa v_press v_one v_ref
thermo		10

run 50