tri(N, M=None, k=0, dtype=<class 'float'>, *, like=None)

Parameters

N : int

Number of rows in the array.

M : int, optional

Number of columns in the array. By default, M is taken equal to N.

k : int, optional

The sub-diagonal at and below which the array is filled. k = 0 is the main diagonal, while k < 0 is below it, and k > 0 is above. The default is 0.

dtype : dtype, optional

Data type of the returned array. The default is float.

like : array_like

Reference object to allow the creation of arrays which are not NumPy arrays. If an array-like passed in as like supports the __array_function__ protocol, the result will be defined by it. In this case, it ensures the creation of an array object compatible with that passed in via this argument.

versionadded

Returns

tri : ndarray of shape (N, M)

Array with its lower triangle filled with ones and zero elsewhere; in other words T[i,j] == 1 for j <= i + k , 0 otherwise.

An array with ones at and below the given diagonal and zeros elsewhere.

Examples

>>> np.tri(3, 5, 2, dtype=int)
array([[1, 1, 1, 0, 0],
       [1, 1, 1, 1, 0],
       [1, 1, 1, 1, 1]])

>>> np.tri(3, 5, -1)
array([[0.,  0.,  0.,  0.,  0.],
       [1.,  0.,  0.,  0.,  0.],
       [1.,  1.,  0.,  0.,  0.]])

See :

Back References

The following pages refer to to this document either explicitly or contain code examples using this.

skimage.transform.finite_radon_transform.frt2 dask.array.creation.tri skimage.transform.finite_radon_transform.ifrt2

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GitHub : /numpy/lib/twodim_base.py#370
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