[Numpy-discussion] np.concatenate and np.column_stack shouldn't they be the same?

[John [H2O]]

Can someone explain:

x = np.arange(20)
y = np.arange(20)

z = np.vstack((x,y)).T

is equal to:

z = np.column_stack((x,y))

but this does not do the same:

z = np.concatenate((x,y),axis=0)  # or with axis=1

Seems I should be able to use concatenate to make a column stack??

Thanks!
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