Function _unsigned_subtract

numpy/lib/_histograms_impl.py:328–353

Subtract two values where a >= b, and produce an unsigned result This is needed when finding the difference between the upper and lower bound of an int16 histogram

(a, b)

def _unsigned_subtract(a, b):
    """
    Subtract two values where a >= b, and produce an unsigned result

    This is needed when finding the difference between the upper and lower
    bound of an int16 histogram
    """
    # coerce to a single type
    signed_to_unsigned = {
        np.byte: np.ubyte,
        np.short: np.ushort,
        np.intc: np.uintc,
        np.int_: np.uint,
        np.longlong: np.ulonglong
    }
    dt = np.result_type(a, b)
    try:
        unsigned_dt = signed_to_unsigned[dt.type]
    except KeyError:
        return np.subtract(a, b, dtype=type(dt))
    else:
        # we know the inputs are integers, and we are deliberately casting
        # signed to unsigned.  The input may be negative python integers so
        # ensure we pass in arrays with the initial dtype (related to NEP 50).
        return np.subtract(np.asarray(a, dtype=dt), np.asarray(b, dtype=dt),
                           casting='unsafe', dtype=unsigned_dt)


def _get_bin_edges(a, bins, range, weights):