Hi, I am trying to extract n columns from an 2D array and then operate on the extracted columns. Below is the code:
A is an MxN 2D array. u = A[:,:n] #extract the first n columns from A B = np.dot(u, u.T) #take outer product. This code works when n>1. However, when n=1, u becomes an 1D array instead of an Mx1 2D array and the code breaks down. I wonder if there is any way to keep u=A[:,:n] an Mxn array no matter what value n takes. I do not want to use matrix because array is more convenient in other places. Thanks, Tom
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