mvpa2.clfs.gpr.Ndiag

mvpa2.clfs.gpr.Ndiag(v, k=0)

Extract a diagonal or construct a diagonal array.

Parameters :

v : array_like

If v is a 2-D array, return a copy of its k-th diagonal. If v is a 1-D array, return a 2-D array with v on the k-th diagonal.

k : int, optional

Diagonal in question. The default is 0.

Returns :

out : ndarray

The extracted diagonal or constructed diagonal array.

See also

diagonal
Return specified diagonals.
diagflat
Create a 2-D array with the flattened input as a diagonal.
trace
Sum along diagonals.

Examples

>>> x = np.arange(9).reshape((3,3))
>>> x
array([[0, 1, 2],
       [3, 4, 5],
       [6, 7, 8]])
>>> np.diag(x)
array([0, 4, 8])
>>> np.diag(np.diag(x))
array([[0, 0, 0],
       [0, 4, 0],
       [0, 0, 8]])

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NITRC-listed