numpy.around(a, decimals=0, out=None)

class numpy.vectorize(pyfunc, otypes='', doc=None, excluded=None, cache=False)

numpy.arccos(x[, out]) = Trigonometric inverse cosine, element-wise. The inverse of

numpy.absolute(x[, out]) = Calculate the absolute value element-wise.

numpy.ma.mask_rowcols(a, axis=None)

numpy.conj(x[, out]) = Return the complex conjugate, element-wise. The complex conjugate of a complex number is obtained by

chararray.swapaxes(axis1, axis2) Return a view of the array with axis1 and axis2

chararray.astype(dtype, order='K', casting='unsafe', subok=True, copy=True) Copy of the array, cast

MaskedArray.nonzero()

numpy.mean(a, axis=None, dtype=None, out=None, keepdims=False)