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#!/usr/bin/env python3
import random
from math import *
# size of the grid
L=24
# boundary thickness (must be even)
l0=4
# activity and interaction
z=3
J=5
# draw random dimers in a select area
def fill_dimers(mask,direction):
if(direction=="h"):
d=[1,0]
else:
d=[0,1]
dimers=[]
# keep track of which sites are occupied
occupied=[]
for i in range(L):
occupied.append([])
for j in range(L):
occupied[i].append(0)
for i in range(10000):
# pick a random edge (indexed by its lower-left corner)
e=None
while(e==None or e[0]+d[0]>=L or e[1]+d[1]>=L or mask[e[0]][e[1]]==0 or mask[e[0]+d[0]][e[1]+d[1]]==0):
e=[random.randint(0,L-1),random.randint(0,L-1)]
# check whether a dimer can be added to the edge
if(occupied[e[0]][e[1]]==0 and occupied[e[0]+d[0]][e[1]+d[1]]==0):
# number of interactions
interactions=0
if(e[0]+2*d[0]<L and e[1]+2*d[1]<L and occupied[e[0]+2*d[0]][e[1]+2*d[1]]==1):
interactions=interactions+1
if(e[0]-d[0]>=0 and e[1]-d[1]>=0 and occupied[e[0]-d[0]][e[1]-d[1]]==1):
interactions=interactions+1
# probability of adding the dimer
p=1/(1+1/z*exp(-J*interactions))
if(p>random.random()):
# add dimer
dimers.append(e)
occupied[e[0]][e[1]]=1
occupied[e[0]+d[0]][e[1]+d[1]]=1
return(dimers)
# find interactions
def interactions(dimers,direction):
if(direction=="h"):
d=[1,0]
else:
d=[0,1]
out=[]
for d1 in dimers:
for d2 in dimers:
if(d1[0]-d2[0]==2*d[0] and d1[1]-d2[1]==2*d[1]):
out.append([d2[0]+d[0],d2[1]+d[1]])
return(out)
# draw dimers
def draw_dimers(v_dimers,h_dimers,file_desc,color):
for d in v_dimers:
print("\\dimer{[color="+color+"]("+str(d[0])+","+str(d[1])+")}v", file=file_desc)
print("", file=file_desc)
for d in h_dimers:
print("\\dimer{[color="+color+"]("+str(d[0])+","+str(d[1])+")}h", file=file_desc)
print("", file=file_desc)
# draw interactions
def draw_interactions(v_interactions,h_interactions,file_desc):
for d in v_interactions:
print("\\interaction{("+str(d[0])+","+str(d[1])+")}v", file=file_desc)
print("", file=file_desc)
for d in h_interactions:
print("\\interaction{("+str(d[0])+","+str(d[1])+")}h", file=file_desc)
print("", file=file_desc)
# init tikz file
def init_tikz(filename):
file_desc=open(filename,"w")
print("\\documentclass{standalone}\n\n\\usepackage{tikz}\n\\usepackage{dimer}\n\\usetikzlibrary{decorations.pathmorphing}\n\n\\begin{document}\n\\begin{tikzpicture}\n\n", file=file_desc)
return(file_desc)
# close tikz file
def close_tikz(file_desc):
print("\\end{tikzpicture}\n\\end{document}", file=file_desc)
file_desc.close()
mu=int(L/2)
# masks
# init
v_mask=[]
h_mask=[]
for i in range(L):
v_mask.append([])
h_mask.append([])
for j in range(L):
v_mask[i].append(1)
h_mask[i].append(0)
# draw masks
for i in range(mu-l0,mu+l0):
for j in range(mu+1,mu+5):
v_mask[i][j]=0
for i in range(mu-2*l0,mu+2*l0):
for j in range(mu-5,mu+1):
v_mask[i][j]=0
for i in range(mu-l0+2,mu+l0-2):
for j in range(mu+1,mu+4):
h_mask[i][j]=1
for i in range(mu-l0,mu+l0):
h_mask[i][mu]=1
for i in range(mu-2*l0+2,mu+2*l0-2):
for j in range(mu-4,mu):
h_mask[i][j]=1
h_mask[mu-1][mu+1]=0
h_mask[mu-1][mu+2]=0
h_mask[mu-1][mu-3]=0
h_mask[mu-1][mu-2]=0
h_mask[mu][mu-3]=0
h_mask[mu][mu-2]=0
# random dimers in mask
v_dimers=fill_dimers(v_mask,"v")
h_dimers=fill_dimers(h_mask,"h")
# mantle dimers
h_mantle=[]
for i in range(0,l0):
h_mantle.append([mu-l0+2*i,mu+4])
for i in range(0,4):
h_mantle.append([mu+l0-2,mu+4-i])
h_mantle.append([mu-l0,mu+4-i])
for i in range(0,int(l0/2)):
h_mantle.append([mu+l0+2*i,mu])
h_mantle.append([mu-l0-2-2*i,mu])
for i in range(0,5):
h_mantle.append([mu+2*l0-2,mu-i])
h_mantle.append([mu-2*l0,mu-i])
for i in range(0,2*l0):
h_mantle.append([mu-2*l0+2*i,mu-5])
v_mantle=[]
v_mantle.append([mu-1,mu+1])
v_mantle.append([mu-1,mu-3])
v_mantle.append([mu,mu-3])
# interactions
v_interactions=interactions(v_dimers+v_mantle,"v")
h_interactions=interactions(h_dimers+h_mantle,"h")
# files
interaction=init_tikz("interaction.tikz.tex")
print("\\grid{"+str(L-1)+"}{"+str(L-1)+"}{(0,0)}\n", file=interaction)
draw_interactions(v_interactions,h_interactions,interaction)
draw_dimers(v_dimers+v_mantle,h_dimers+h_mantle,interaction,"black")
close_tikz(interaction)
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