Web Reference: When one or more of the arrays to be concatenated is a MaskedArray, this function will return a MaskedArray object instead of an ndarray, but the input masks are not preserved. The alternatives all use np.concatenate. They just massage the input list in various ways before hand. np.stack for example adds an extra dimension to all input arrays. We can concatenate two 1-D arrays along the second axis which would result in putting them one over the other, ie. stacking. We pass a sequence of arrays that we want to join to the stack() method along with the axis.
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