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# numpy.atleast_1d

`numpy.``atleast_1d`(*arys)

  Convert inputs to arrays with at least one dimension.

  Scalar inputs are converted to 1-dimensional arrays, whilst higher-dimensional inputs are preserved.

  Parameters : | array1, array2, ... : array_like One or more input arrays.
  Returns : | ret : ndarray An array, or sequence of arrays, each with `a.ndim >= 1`. Copies are made only if necessary.

  See also

  `atleast_2d`, `atleast_3d`

  Examples

      >>> np.atleast_1d(1.0)
      array([ 1.])

      >>> x = np.arange(9.0).reshape(3,3)
      >>> np.atleast_1d(x)
      array([[ 0.,  1.,  2.],
             [ 3.,  4.,  5.],
             [ 6.,  7.,  8.]])
      >>> np.atleast_1d(x) is x
      True

      >>> np.atleast_1d(1, [3, 4])
      [array([1]), array([3, 4])]

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