擅长:python、mysql、java
<p>您的错误在上限:</p>
<pre><code>mymatrix = np.random.rand(col,row)
for i in range(0,3):
for j in range(0,3):
if mymatrix[i,j] <= 0.5:
mymatrix[i,j] = -1.0
elif mymatrix[i,j] >= 0.5:
mymatrix[i,j] = 1.0
print (mymatrix)
</code></pre>