From for loops to numpy dot implementation

N=100 

reliab=zeros((N,N))


for i in range(N):    

    for j in range(N):
        if random() < 0.6:
            reliab[i,j] = 1
        else:
            reli开发者_JAVA百科ab[i,j] = 0

As in my code this matrix filling is recalled a huge number of times, these for loops should be changed with a dot product...but I dunno how to do it... Anyone willing to help me?

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I'm not sure I understand your problem completely, but the following line should be doing the same thing as your code:

reliab = numpy.int32(numpy.random.rand(N,N) < 0.6)

---

>>> import numpy as np
>>> reliab = np.random.random((N,N))
>>> reliab = reliab < 0.6
>>> reliab.dtype = np.int8
>>> reliab
array([[0, 0, 0, ..., 1, 0, 1],
       [0, 1, 1, ..., 0, 1, 0],
       [1, 1, 0, ..., 1, 0, 1],
       ..., 
       [0, 1, 0, ..., 1, 1, 1],
       [0, 0, 1, ..., 1, 1, 1],
       [0, 1, 0, ..., 0, 0, 0]], dtype=int8)