You should do direct indexing L[i,0]=A[i,0]/A[0,0]
, otherwise you are working on a view rather than then a slice of the original array
.
Numpy Assigning with Indexing
题
Why does the following code not produce the expected assignment?
A = np.array([[ 9., 2., 7.], [ 3., 3., 1.], [ 4., 1., 6.]])
L = np.zeros([3,3])
i = range(1,3)
L[i][:,[0]] = A[i][:,[0]] / A[0,0]
L continues to contain all zeros. How do I produce what I expect to see (i.e. [[ 0., 0., 0.], [ .333, 0., 0.], [ .444, 0., 0.]])?
解决方案
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