# numpy.ma.in1d

ma.in1d(ar1, ar2, assume_unique=False, invert=False)

  Test whether each element of an array is also present in a second array.

  The output is always a masked array. See `numpy.in1d` for more details.

  We recommend using `isin` instead of `in1d` for new code.

  See also

  `isin`

    Version of this function that preserves the shape of ar1.

  `numpy.in1d`

    Equivalent function for ndarrays.

  Notes

  New in version 1.4.0.