Vandermonde Matrix

easynumpy_linalg

Implement vander(array).

Build the Vandermonde matrix with increasing powers: the element at row i, column j is array[i] ** j. A length-n vector gives an n × n matrix, e.g. [1, 2, 3] → [[1, 1, 1], [1, 2, 4], [1, 3, 9]].

np.vander is not allowed — construct it with broadcasting. No for/while loops.

Constraints

no vander
no for/while loops

Your solution

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Hints

Hint 1

Broadcast: array[:, None] raises each element to the powers np.arange(len(array)), giving increasing columns.