trunc(x, out=None, **kwargs)

Return the truncated value of the input, element-wise. The truncated value of the scalar x is the nearest integer i which is closer to zero than x is. In short, the fractional part of the signed number x is discarded.

  • x (ndarray or scalar) – Input data.

  • out (ndarray or None, optional) – A location into which the result is stored.


  • y (ndarray or scalar) – The truncated value of each element in x. This is a scalar if x is a scalar.

  • .. note:: – This function differs from the original numpy.trunc in the following aspects:

    • Do not support where, a parameter in numpy which indicates where to calculate.

    • Cannot cast type automatically. Dtype of out must be same as the expected one.

    • Cannot broadcast automatically. Shape of out must be same as the expected one.

    • If x is plain python numeric, the result won’t be stored in out.


>>> a = np.array([-1.7, -1.5, -0.2, 0.2, 1.5, 1.7, 2.0])
>>> np.trunc(a)
array([-1., -1., -0.,  0.,  1.,  1.,  2.])