王兰道算法的Python程序在点后停止运行

问题描述 投票：1回答：1

我写了一个python代码，在三维聚合物上执行王兰道算法。在此附上相关代码。

1）原始代码。WL3D.py

from scipy import *
import sys
import numpy as np
from pylab import *
from spinfun import SARW
from spinfun import Energy
from spinfun import Transform
from spinfun import Equality

Niter = int(input("Enter number of MC steps:"))
L=int(input("Enter number of monomers:"))
N=int(input("Enter the dimensions of lattice:"))
spin=zeros((N,N,N), dtype=int)

#1)Initialisation of lattice
#Gx,Gy,Gz=SARW(spin,N)
Gx=[300, 300, 300, 299, 299, 298, 297, 297, 298, 299, 299, 299, 299, 298, 298, 298, 297, 297, 297, 297, 298, 298, 298, 298, 298, 297, 297, 297, 297, 297, 297, 298, 298, 299, 300, 300, 300, 299, 299, 299, 300, 300, 299, 299, 299, 300, 300, 300, 300, 300, 300, 300, 300, 299, 299, 298, 297, 297, 298, 299, 299, 299, 299, 298, 298, 298, 297, 297, 297, 297, 298, 298, 298, 298, 298, 297, 297, 297, 297, 297, 297, 298, 298, 299, 300, 300, 300, 299, 299, 299, 300, 300, 299, 299, 299, 300, 300, 300, 300, 300]
Gy=[300, 301, 302, 302, 301, 301, 301, 300, 300, 300, 300, 300, 300, 300, 301, 302, 302, 302, 302, 302, 302, 302, 302, 301, 300, 300, 300, 301, 301, 301, 300, 300, 301, 301, 301, 302, 303, 303, 302, 302, 302, 301, 301, 301, 302, 302, 301, 300, 300, 300, 300, 301, 302, 302, 301, 301, 301, 300, 300, 300, 300, 300, 300, 300, 301, 302, 302, 302, 302, 302, 302, 302, 302, 301, 300, 300, 300, 301, 301, 301, 300, 300, 301, 301, 301, 302, 303, 303, 302, 302, 302, 301, 301, 301, 302, 302, 301, 300, 300, 300]
Gz=[300, 300, 300, 300, 300, 300, 300, 300, 300, 300, 299, 298, 297, 297, 297, 297, 297, 298, 299, 300, 300, 299, 298, 298, 298, 298, 297, 297, 298, 299, 299, 299, 299, 299, 299, 299, 299, 299, 299, 298, 298, 298, 298, 297, 297, 297, 297, 297, 298, 299, 300, 300, 300, 300, 300, 300, 300, 300, 300, 300, 299, 298, 297, 297, 297, 297, 297, 298, 299, 300, 300, 299, 298, 298, 298, 298, 297, 297, 298, 299, 299, 299, 299, 299, 299, 299, 299, 299, 299, 298, 298, 298, 298, 297, 297, 297, 297, 297, 298, 299]
for p in range(50):
    spin[Gx[p],Gy[p],Gz[p]]=1
E1=Energy(Gx,Gy,Gz,spin)
print "Initial energy of system is",E1
f1=open("Initial_Data.txt",'w')
for i in range(len(Gx)):
    f1.write("%d %d %d \n"%(Gx[i],Gy[i],Gz[i]))
f1.close()

#2) Matrices and terms required
Ener=(arange(59)-58).tolist()  #List of energy values
E0=-58 #GRound state
lngE=zeros(len(Ener),dtype=float) #LogG
Hist=zeros(len(Ener),dtype=float)
lnf=1.0
#3)The WLA

for time in range(Niter):
    i2=0
    while i2 < L:
        #E1=Energy(Gx,Gy,Gz,spin)
        Gx1,Gy1,Gz1=Transform(Gx,Gy,Gz,spin)   #Attempting a random move
        E2=Energy(Gx1,Gy1,Gz1,spin)   #Energy calculation of changed configuration
        P = exp(lngE[E1-E0]-lngE[E2-E0]) #Acceptance probability
        if P > uniform(0,1):
            Gx,Gy,Gz=Equality(Gx1,Gy1,Gz1)
            print 'Ok', Gx[0],Gy[0],Gz[0],E1,E2,time,i2
            E1=E2
        else:
            spin[Gx1[0],Gy1[0],Gz1[0]]=0
            spin[Gx[49],Gy[49],Gz[49]]=1
            print 'Not Ok',Gx[0],Gy[0],Gz[0],E1,E2,time,i2
        Hist[E1-E0] += 1.0
        lngE[E1-E0] += lnf
        i2=i2+1
    if time % 1000 == 0:
        Ha = sum(Hist)/(len(Hist))
        Hmin = min(Hist)
        if Hmin > 0.8*Ha:
            print time,'Histogram is flat', Hmin, Ha, 'f=',exp(lnf),'lnf=',lnf
            Hist=zeros(len(Hist))
            lnf=lnf/2.0
            if abs(lnf-0.0) < 0.00000001:
                break
        else:
            print time,'Not flat',Hmin, Ha, 'f=',exp(lnf),'lnf=',lnf



f=open("Final_Data.txt",'w')
for i5 in range(len(lngE)):
    f.write("%f %f \n"%(Ener[i5],lngE[i5]))
f.close()

下面是代码 "spinfun.py"，其中有上述代码中使用的函数。

from scipy import *
import sys
import numpy as np
from pylab import *
spin=zeros((50,50,50), dtype=int)

Gx2=[25,25,25,24,24,23,22,22,23,24,24,24,24,23,23,23,22,22,22,22,23,23,23,23,23,22,22,22,22,22,22,23,23,24,25,25,25,24,24,24,25,25,24,24,24,25,25,25,25,25]                                 
Gy2=[25,26,27,27,26,26,26,25,25,25,25,25,25,25,26,27,27,27,27,27,27,27,27,26,25,25,25,26,26,26,25,25,26,26,26,27,28,28,27,27,27,26,26,26,27,27,26,25,25,25]
Gz2=[25,25,25,25,25,25,25,25,25,25,24,23,22,22,22,22,22,23,24,25,25,24,23,23,23,23,22,22,23,24,24,24,24,24,24,24,24,24,24,23,23,23,23,22,22,22,22,22,23,24]
#A,B,C=np.loadtxt("Self2_trials.txt",usecols=(0,1,2),unpack=True,dtype=int)

#########
def SARW(spin,N):
    g2=1
    g1=0
    i=N/2;j=N/2;k=N/2
    Gx=[N/2];Gy=[N/2];Gz=[N/2]
    spin[N/2,N/2,N/2]=1
    while g2 < 50:
        h=uniform(0,1)
        if 0.0 <= h <= 0.167:
            k=k+1
        elif 0.167 <= h <= 0.334:
            j=j+1
        elif 0.334 <= h <= 0.501:
            i=i+1
        elif 0.501 <= h <= 0.668:
            i=i-1
        elif 0.668 <= h <= 0.835:
            j=j-1
        else:
            k=k-1
        if spin[i,j,k] == 0:
            print 'Ok',i,j,k,h,g2
            spin[i,j,k]=1
            Gx=Gx+[i]
            Gy=Gy+[j]
            Gz=Gz+[k]
            g2=g2+1
        else:
            print 'Not Ok',i,j,k,h
            if 0.0 <= h <= 0.167:
                k=k-1
            elif 0.167 <= h <= 0.334:
                j=j-1
            elif 0.334 <= h <= 0.501:
                i=i-1
            elif 0.501 <= h <= 0.668:
                i=i+1
            elif 0.668 <= h <= 0.835:
                j=j+1
            else:
                k=k+1
        g1=g1+1
    return Gx,Gy,Gz
############

def Energy(Gx,Gy,Gz,spin):
    S=0
    Su=[]
    for i in range(50):
        i1=Gx[i]
        j1=Gy[i]
        k1=Gz[i]
        n=spin[i1+1,j1,k1]+spin[i1-1,j1,k1]+spin[i1,j1+1,k1]+spin[i1,j1-1,k1]+spin[i1,j1,k1+1]+spin[i1,j1,k1-1]
        S=S+n
        Su=Su+[n]
        E1=(S-98)/2
        E=-E1
    return E

###########

def Transform(Gx,Gy,Gz,spin):
    Gx1=[];Gy1=[];Gz1=[]
    m=0
    while m < 50:
        Gx1=Gx1+[Gx[m]]
        Gy1=Gy1+[Gy[m]]
        Gz1=Gz1+[Gz[m]]
        m=m+1
    i=Gx1[0];j=Gy1[0];k=Gz1[0]
    g=0
    g1=0
    while g < 1:
        h=uniform(0,1)
        if 0.0 <= h <= 0.167:
            k=k+1
        elif 0.167 <= h <= 0.334:
            j=j+1
        elif 0.334 <= h <= 0.501:
            i=i+1
        elif 0.501 <= h <= 0.668:
            i=i-1
        elif 0.668 <= h <= 0.835:
            j=j-1
        else:
            k=k-1
        if spin[i,j,k] == 0:
            spin[i,j,k]=1
            spin[Gx1[49],Gy1[49],Gz1[49]]=0
            for i1 in range(50):
                n1=49-i1
                if n1 != 0:
                    Gx1[n1]=Gx1[n1-1]
                    Gy1[n1]=Gy1[n1-1]
                    Gz1[n1]=Gz1[n1-1]
                else:
                    Gx1[n1]=i;Gy1[n1]=j;Gz1[n1]=k
            g=g+1
        else:
            if 0.0 <= h <= 0.167:
                k=k-1
            elif 0.167 <= h <= 0.334:
                j=j-1
            elif 0.334 <= h <= 0.501:
                i=i-1
            elif 0.501 <= h <= 0.668:
                i=i+1
            elif 0.668 <= h <= 0.835:
                j=j+1
            else:
                k=k+1
        g1=g1+1
    return Gx1,Gy1,Gz1
########
def Equality(Gx,Gy,Gz):
    Gx1=[];Gy1=[];Gz1=[]
    for m in range(50):
        Gx1=Gx1+[Gx[m]]
        Gy1=Gy1+[Gy[m]]
        Gz1=Gz1+[Gz[m]]
    return Gx1,Gy1,Gz1

SO这里是我现在面临的问题。当我执行这段代码时，代码运行得很好，但在某一步突然停止。代码没有返回任何异常或错误，也没有终止，所以我必须杀死执行。

我搜索了一下答案，我试着用下面的命令来追踪代码的工作情况。

python -m trace --trace WL3D.py

上面一行很明显碰到了一堆语句打印出来，过了几行就开始执行代码了。这时它想用输入来测试代码。于是我给了必要的输入，它现在正在运行一个无限循环。

我无法追溯到是算法的哪一部分在无限循环中发送代码。有没有其他可能的方法来解决这个问题？非常感谢任何帮助。

P.S：我希望你在运行代码的时候添加以下细节。

输入MC的步数。你可以给任何你想要的整数。

输入单体数量：50（我写的这段代码是先对50个单体的聚合物进行计算）。

输入网格的尺寸。600 (您可以使用任何整数，但我发送的代码需要600。你可以使用任何整数，如果你注释第17-21行，取消注释第16行。)

python function infinite-loop montecarlo mtrace
1个回答
0
投票

这是一段相当复杂的代码，我也不太明白不同的部分应该做什么，但我很确定问题出在了 Transform 函数。如果你在 while 循环中添加一个计数器，你会发现有时候 g < 1 条件将一直为真，代码将永远不会退出循环。我注意到你先初始化然后再更新 g1但你从来不用它 也许你忘了添加一些连接 g 和 g1?

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