Esempio n. 1
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    def test_1(self):
        a = np.arange(30).reshape(10, 3).astype(np.float32)
        n = 10
        res = np.zeros(n * (n-1) // 2, dtype=np.float32)
        box = np.ones(3).astype(np.float32) * 30

        cgmath.intra_distance_array_withpbc(a, box, res)
        ref = util.slow_intra_distance_withpbc(a, box)

        assert_array_almost_equal(ref, res)
Esempio n. 2
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    def test_1(self):
        for prec in self.precs:
            a = np.arange(30).reshape(10, 3).astype(prec)
            n = 10
            res = np.zeros(n * (n-1) // 2, dtype=prec)
            box = np.ones(3).astype(prec) * 30

            cgmath.intra_distance_array_withpbc(a, box, res)
            ref = util.slow_intra_distance_withpbc(a, box)

            assert_array_almost_equal(ref, res)
Esempio n. 3
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def cellgrid_self_distance_array(cg1):
    """Calculate all pairwise distances within a certain CellGrid

    :Returns:
     indices, distances

    indices - (n, 2)
    distances (n)
    """
    box = cg1.box

    Nreq = _calculate_self_distance_array_size(cg1)
    indices = np.empty((Nreq, 2), dtype=np.int)
    dist = np.empty(Nreq, dtype=np.float32)

    pos = 0
    for cell in cg1:
        n = len(cell)
        if n > 1:
            # Do own cell as a self distance comparison
            cgmath.intra_distance_array_withpbc(
                cell.coordinates,
                box,
                dist[pos:]
            )
            cgmath.intra_index_array(
                cell.indices,
                indices[pos:]
            )
            pos += n * (n - 1) // 2
        # Then all half neighbours as a full comparison
        for addr in cell.half_neighbours:
            other = cg1[addr]
            if not other:
                continue
            cgmath.inter_distance_array_withpbc(
                cell.coordinates,
                other.coordinates,
                box,
                dist[pos:]
            )
            cgmath.inter_index_array(
                cell.indices,
                other.indices,
                indices[pos:]
            )
            pos += n * len(other)

    return indices, dist
Esempio n. 4
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def cellgrid_self_distance_array(cg1):
    """Calculate all pairwise distances within a certain CellGrid

    :Returns:
     indices, distances

    indices - (n, 2)
    distances (n)
    """
    box = cg1.box

    Nreq = _calculate_self_distance_array_size(cg1)
    indices = np.empty((Nreq, 2), dtype=np.int)
    dist = np.empty(Nreq, dtype=cg1.datatype)

    pos = 0
    for cell in cg1:
        n = len(cell)
        if n > 1:
            # Do own cell as a self distance comparison
            cgmath.intra_distance_array_withpbc(cell.coordinates, box,
                                                dist[pos:])
            cgmath.intra_index_array(cell.indices, indices[pos:])
            pos += n * (n - 1) // 2
        # Then all half neighbours as a full comparison
        for addr in cell.half_neighbours:
            other = cg1[addr]
            if not other:
                continue
            cgmath.inter_distance_array_withpbc(cell.coordinates,
                                                other.coordinates, box,
                                                dist[pos:])
            cgmath.inter_index_array(cell.indices, other.indices,
                                     indices[pos:])
            pos += n * len(other)

    return indices, dist