从Matlab翻译成Python。列表索引超出范围。

Question

有谁知道它为什么告诉我列表索引超出范围？我试图“翻译”一个Matlab文件，并且我创建了列表而不是单元阵列，现在主要问题在于索引，它对我来说似乎是正确的，我不知道如何有问题

#Projection operator Pi 
piOperator = np.zeros((N*N, N*N)) 

#Psi0 state 
Psi0 = np.zeros((N*N, 1)) 
for i in xrange(0 , N-1): 
    aux = np.zeros((N,1)) #Auxiliary vector 
    aux[i]= 1 
    A = np.sqrt(G[:,i]) 
    psi = [] 
    P = [] 
    psi.append(np.tensordot(aux, A)) 
    P.append(np.dot(psi[i],np.transpose(psi[i]))) 
    piOperator = piOperator + P[i] 
    Psi0 = Psi0 + psi[i] 


Psi0 = 1/np.sqrt(N)*Psi0 


--------------------------------------------------------------------------- 
IndexError        Traceback (most recent call last) 
<ipython-input-450-0816498ad018> in <module>() 
11  P = [] 
12  psi.append(np.tensordot(aux, A)) 
---> 13  P.append(np.dot(psi[i],np.transpose(psi[i]))) 
14  piOperator = piOperator + P[i] 
15  Psi0 = Psi0 + psi[i] 

IndexError: list index out of range 

原来Matlab代码是：

Pi = zeros(n^2,n^2); 
Psi0 = zeros(n^2,1); 
for k=1:n 
    aux = zeros(n,1); 
    aux(k) = 1; 
    psi{k} = kron(aux,sqrt(G(:,k))); 
    P{k} = psi{k} * psi{k}'; 
    Pi = Pi + P{k}; 
    Psi0 = Psi0 + psi{k}; 
end 
Psi0 = 1/sqrt(n)*Psi0; 

Answer 1

您清除PSI变量每次迭代。在循环之前只是初始化：

#Projection operator Pi 
piOperator = np.zeros((N*N, N*N)) 

#Psi0 state 
Psi0 = np.zeros((N*N, 1)) 
psi = [] 
P = [] 
for i in xrange(0 , N-1): 
    aux = np.zeros((N,1)) #Auxiliary vector 
    aux[i]= 1 
    A = np.sqrt(G[:,i]) 
    psi.append(np.tensordot(aux, A)) 
    P.append(np.dot(psi[i],np.transpose(psi[i]))) 
    piOperator = piOperator + P[i] 
    Psi0 = Psi0 + psi[i] 


Psi0 = 1/np.sqrt(N)*Psi0