### Navigation

- index
- modules |
- next |
- previous |
- NumPy v1.3 Manual (DRAFT) »
- NumPy Reference »
- Routines »
- Array creation routines »

# numpy.tri

`numpy.``tri`(N, M=None, k=0, dtype=<type 'float'>)

  Construct an array filled with ones at and below the given diagonal.

  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 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.
  Returns: | T : (N,M) ndarray Array with a lower triangle filled with ones, in other words `T[i,j] == 1` for `i <= j + k`.

  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.]])

### Navigation

- index
- modules |
- next |
- previous |
- NumPy v1.3 Manual (DRAFT) »
- NumPy Reference »
- Routines »
- Array creation routines »