Exemple #1
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def test_cco():
    """Tests of base centered orthorhombic lattice identification."""

    A = np.transpose([[0.5,1,0],[0.5,-1,0],[0,0,3]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 38

    A = np.transpose([[1,1,1],[1,-1,-1],
                      [0,-1.73205,1.73205]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 13

    A = np.transpose([[1,1,1],[2,-1,-1],
                      [-0.3333333,-1.54116,1.87449]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 23

    A = np.transpose([[1,1,1],
                      [1.61803,-0.618034,-1],
                      [-1.05557,1.99895,-0.943376]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 40

    A = np.transpose([[1, 1, 1],
                      [1.41421, -1.41421, 0],
                      [-1.43541, -1.43541, 1.37083]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 36
Exemple #2
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def test_tric():
    """Test the triclinic littice identification."""

    A = [[1,0,0],[0,1,0],[0,0,1]]
    lat_t, nig_n, lat_f, basis = niggli_id(A,G=[1, 2, 3, .1, .2, .3])
    assert nig_n == 31
    
    A = [[1,0,0],[0,1,0],[0,0,1]]
    lat_t, nig_n, lat_f, basis = niggli_id(A,G=[1, 2, 3, -.1, -.2, -.3])
    assert nig_n == 44
Exemple #3
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def test_fco():
    """Tests of face centered orthorhombic lattice identification."""

    A = np.transpose([[0,1,1.5],[0.5,0,1.5],[0,0,3]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 26

    A = np.transpose([[1,1,-1],[0.779796,-1.1798,1],
                 [-1.04442,-1.43973,-1.68415]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 16
Exemple #4
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def test_hex():

    A = np.transpose([[1,0,0],[0.5,-0.8660254037844386,0],
                      [0,0,2]])
    lat_t, nig_n, lat_f, basis = niggli_id(A,G=[1.0, 0.99999999999999989, 4.0, 0.0, 0.0, -0.5])
    assert nig_n == 12

    A = np.transpose([[0,0,-0.5],[1,0,0],
                      [-0.5,0.8660254037844386,0]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 22
Exemple #5
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def _test_case(U,Nu,Cu,O,No,Co,crystal_fam,HNFs):
    """Tests a set of HNFs to see if they preserve the symmetry of the
    desired crystal family.

    Args:
        U (numpy array): The users cell as a column matrix.
        Nu (numpy array): The users niggli cell as a column matrix.
        Cu (numpy array): The transformation from the users niggli cell to the users cell. 
        No (numpy array): Our niggli cell as a column matrix.
        Co (numpy array): The transformation from our niggli cell to our. 
        O (numpy array): Our cell as a column matrix.
        crystal_fam (int): An integer indicating the crystal family of the users cell.
        HNFs (list of lists): A list of the HNF matrices to be testsed. 

    Returns:
        True if the parent cell symmetry is preserved. False otherwise.
    """
    Bs = transform_supercells(HNFs,No,Nu,Co,Cu,O)
    for i in range(len(Bs)):
        B = Bs[i]
        # if crystal_fam in [3]:            
        lat_name, niggli_n, lat_fam, c_b = niggli_id(B,eps_=1E-2)
        # else:
        #     lat_name, niggli_n, lat_fam, c_b = niggli_id(B)
        r = np.linalg.inv(np.transpose(U))
        g = np.linalg.inv(np.transpose(B))
        temp = np.round(np.dot(np.linalg.inv(g),r),3)
        if lat_fam > crystal_fam or not np.allclose(temp%1,0):
            print('lf',lat_fam,'cf',crystal_fam,'com',temp%1,"HNF",HNFs[i])
            print("B",np.transpose(B))
            return False

    return True
Exemple #6
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def test_stet():
    """Tests of simple tet lattice identification."""

    a1 = np.array([1,0,0])
    a2 = np.array([0,1,0])
    a3 = np.array([0,0,2])

    As = [[a1+a2,a2,a3+a1],[a1+a2+a3,a2+a3,a1+a2],[a1,a2+a1,a3+a3],[-a1,-a2+a3,a3]]
    As = [np.transpose(i) for i in As]

    for A in As:
        lat_t, nig_n, lat_f, basis = niggli_id(A)
        assert nig_n == 11

    A = np.transpose([[0,0,0.5],[1,0,0],[0,1,0]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 21
Exemple #7
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def test_sm():
    """Tests of the simple monoclinic lattice identification."""

    A = np.transpose([[2,0,0],
                      [0,2,0],
                      [0.5,0,2]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 33

    A = np.transpose([[1,1,1],
                      [1.61803,-0.618034,-1],
                      [-0.668912,1.96676,-1.29785]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 35

    A = np.transpose([[1,1,1],
                      [1.22474487,-1.22474487,-1],
                      [-0.165985087,-1.64308297,1.80906806]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 34
Exemple #8
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def test_bctet():
    """Tests of body centered tetragonal lattice identification."""
    A = np.transpose([[-1,1,2],[1,-1,2],[1,1,-2]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 15

    A = np.transpose([[-1, 1, 2],[1, 1.60788, -1.55394],
                     [1.95095, -1.41625, 0.433603]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 7

    A = np.transpose([[-1, 1, 2],[1, 1.60788, -1.55394],
                     [1.80278, -1.47253, 0.762655]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 6

    A = np.transpose([[0,0,2],[1,-2,1],
                  [-2,-1,1]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 18
Exemple #9
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def test_rhom():
    """Tests of rhombohedral lattice identification."""

    A = np.transpose([[1,2,2],[2,1,2],[4,3,3]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 9

    A = np.transpose([[-1,0,-1],[1.51184,0,-0.845178],
                      [-0.255922,-1.44338,0.92259]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 24
     
    A = np.transpose([[-1, 0,-1],[0, -1.32288, -0.5],
                      [-1.11652, -0.610985, 0.616515]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 2
    
    A = np.transpose([[-1,0,-1],[0, -1.32288, 0.5],
                      [-0.548584, 0.774292, 1.04858]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 4
Exemple #10
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def test_bo():
    """Tests of body centered orthorhombic lattice identiication."""

    A = np.transpose([[-0.5,1,1.5],[0.5,-1,1.5],[0.5,1,-1.5]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 19

    A = np.transpose([[1, 1, 2],[1.41144,0.0885622,-2],
                 [-1.99868,1.21232,-0.731822]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 8

    A = np.transpose([[1, 1, 1],[1.61803,-0.61803,-1],
                 [-1.53633,1.36706,-1.33073]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 42

    # Test of failed case.
    A = [[ 0.07364488,  0.        ,  0.        ],
         [ 0.        ,  0.06377834,  0.        ],
       [ 0.48104638,  0.48104638,  0.96209276]]
    lat_t, nig_n, lat_f, basis = niggli_id(A,eps_=1E-10)
    assert lat_t == 'face centered orthorhombic'
    assert lat_f == 5
Exemple #11
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def test_so():
    """Tests of simple orthorhombic lattice identification."""

    As = [[[1.00000000, 0.00000000, 0.00000000],
       [0.00000000, 1.73205080, 0.00000000],
       [0.00000000, 0.00000000, 3.26598640]],
      [[0.50000000, 0.50000000, 0.00000000],
      [0.00000000, 0.00000000, 1.00000000],
      [1.50000000, -1.50000000, 0.00000000]],
      [[0.50000000, 0.50000000, 0.00000000],
      [0.00000000, 0.00000000, 1.00000000],
      [2.00000000, -2.00000000, 0.00000000]]]
    As = [np.transpose(i) for i in As]
    
    for A in As:
        lat_t, nig_n, lat_f, basis = niggli_id(A)
        assert nig_n == 32
Exemple #12
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def test_bcc():
    """Tests of bcc lattice identification."""

    A = [[-1,1,1],[1,-1,1],[1,1,-1]]
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 5
Exemple #13
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def test_sc():
    """Tests of sc lattice identification."""

    A = np.transpose([[1,0,0],[1,1,0],[0,0,1]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 3
Exemple #14
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def test_fcc():
    """Tests of fcc lattice identification."""

    A = np.transpose([[0.5,0,0.5],[0.5,0.5,0],[0,0,1]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 1
Exemple #15
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def cell_test(U,count,max_kpd_=None):
    """Tests the ability of the niggli basis to preserve the symmetry of
    the parent cell under action of the HNF.

    Args:
        U (numpy array): The parent lattice as columns of vector.
        count (dict): A dictionary to count how many times each niggli 
            cell is used.
        max_kpd_ (optional int): The largest k-point to use.

    Returns:
        False if symmetry is not preserved, true if it is. Also returns the 
            count of the niggli basis used.
    """

    if max_kpd_ is None:
        max_kpd = 100000
    else:
        max_kpd = max_kpd_
    
    temp = reduced_cell(U)
    Nu = temp.niggli
    Cu = temp.C

    U_lat_name, U_niggli_n, U_lat_fam, O = niggli_id(U)

    if O is not None:
        tempo = reduced_cell(O)
        No = tempo.niggli
        Co = tempo.C

    count[str(U_niggli_n)] += 1
    
    if U_niggli_n == 1:
        kpds = fcc_kps(max_kpd)
        for kpd in kpds:
            HNFs = fcc.fcc_1(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count

    if U_niggli_n == 2:
        for kpd in range(max_kpd):
            HNFs = rhom.rhom_4_2(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 3:
        kpds = sc_and_bcc_kps(max_kpd)
        for kpd in kpds:
            HNFs = sc.sc_3(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count

    if U_niggli_n == 4:
        for kpd in range(max_kpd):
            HNFs = rhom.rhom_4_2(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 5:
        kpds = sc_and_bcc_kps(max_kpd)
        for kpd in kpds:
            HNFs = bcc.bcc_5(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 6:
        for kpd in range(max_kpd):
            HNFs = bct.body_tet_6(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 7:
        for kpd in range(max_kpd):
            HNFs = bct.body_tet_7(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 8:
        for kpd in range(max_kpd):
            HNFs = bco.body_ortho_8(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 9:
        for kpd in range(max_kpd):
            HNFs = rhom.rhom_9(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 10:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_10_17(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 11:
        for kpd in range(max_kpd):
            HNFs = st.stet_11(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 12:
        for kpd in range(max_kpd):
            HNFs = hx.hex_12(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 13:
        for kpd in range(max_kpd):
            HNFs = cco.base_ortho_38_13(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 14:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_14(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 15:
        for kpd in range(max_kpd):
            HNFs = bct.body_tet_15(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 16:
        for kpd in range(max_kpd):
            HNFs = fco.face_ortho_16(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 17:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_10_17(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 18:
        for kpd in range(max_kpd):
            HNFs = bct.body_tet_18(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 19:
        for kpd in range(max_kpd):
            HNFs = bco.body_ortho_19(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 20:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_20_25(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 21:
        for kpd in range(max_kpd):
            HNFs = st.stet_21(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 22:
        for kpd in range(max_kpd):
            HNFs = hx.hex_22(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 23:
        for kpd in range(max_kpd):
            HNFs = cco.base_ortho_23(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 24:
        for kpd in range(max_kpd):
            HNFs = rhom.rhom_24(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 25:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_20_25(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 26:
        for kpd in range(max_kpd):
            HNFs = fco.face_ortho_26(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 27:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_27(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 28:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_28(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 29:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_29_30(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 30:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_29_30(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 31: # triclinic, nothing to do.
        return True, count
    
    if U_niggli_n == 32:
        for kpd in range(max_kpd):
            HNFs = so.so_32(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 33:
        for kpd in range(max_kpd):
            HNFs = sm.sm_33(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 34:
        for kpd in range(max_kpd):
            HNFs = sm.sm_34(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 35:
        for kpd in range(max_kpd):
            HNFs = sm.sm_35(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 36:
        for kpd in range(max_kpd):
            HNFs = cco.base_ortho_36(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 37:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_37_39(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 38:
        for kpd in range(max_kpd):
            HNFs = cco.base_ortho_38_13(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 39:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_37_39(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 40:
        for kpd in range(max_kpd):
            HNFs = cco.base_ortho_40(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 41:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_41(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
            
    if U_niggli_n == 42:
        for kpd in range(max_kpd):
            HNFs = bco.body_ortho_42(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 43:
        for kpd in range(max_kpd):
            HNFs = ccm.base_mono_43(kpd)
            test = _test_case(U,Nu,Cu,O,No,Co,U_lat_fam,HNFs)
            if not test:
                return False, count
    
    if U_niggli_n == 44: #triclinic
        return True, count
    
    return True, count
Exemple #16
0
def test_cm():
    """Tests of the base centered monoclinic lattice identification."""

    A = np.transpose([[1,1,0],
                      [1,-1,0],
                      [0.5,0,2]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 14

    A = np.transpose([[1,1,1],
                  [1,-1,1],
                  [-1.46391,0,1.96391]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 10

    A = np.transpose([[1,1,1],
                      [0.809568,-1.15957,-1],
                      [-1.05387,-1.61088,1.51474]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 17

    A = np.transpose([[1,1,1],
                  [1.70119,-1.45119,1],
                  [-1.0034,0.0189395,2.23446]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 20

    A = np.transpose([[1,1,1],
                      [1.45119,-1.70119,-1],
                      [-1.16241,-1.56776,1.48018]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 25

    A = np.transpose([[1,1,0],
                      [1.618033,-0.618033,1],
                      [-0.464824,1.464824,1.907413]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 27

    A = np.transpose([[1,1,0],
                      [1.44896,-0.948958,1],
                      [-0.342424,1.342424,2.02006]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 28

    A = np.transpose([[1,1,0],
                      [1.61803,-0.618034,1],
                      [-0.666125,1.16613,2.04852]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 29

    A = np.transpose([[1,1,0],
                      [1.61803,-0.618034,1],
                      [-0.0361373,0.536137,2.38982]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 30

    A = np.transpose([[1,0,1],
                      [1,-1.41421,-1],
                      [-1.85397,-0.854143,1.35397]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 41

    A = np.transpose([[1,0,1],
                      [1,-1.41421,-1],
                      [-1.79092,-1.47209,0.790922]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 37

    A = np.transpose([[1,0,1],
                      [0,-1.73205,-1],
                      [-1.66542,-0.672857,1.66542]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 39

    A = np.transpose([[1,1,1],
                      [1.64194,-1.14194,-1],
                      [-1.39716,-1.34718,1.49434]])
    lat_t, nig_n, lat_f, basis = niggli_id(A)
    assert nig_n == 43
Exemple #17
0
def find_supercells(U, kpt, exact=False):
    """Generates the symmetry preserving supercells for the users lattice and
    k-point density.

    Args:
        U (numpy.array): The lattice vectors as columns of a matrix.
        kpt (int): The target k-point density desired.
        exact (bool): True if only the target k-point density is to be used.

    Returns:
        supercells (numpy.array): list of symmetry preserving supercells.

    Raises:
        ValueError if the lattice type can't be identified.

    """

    from opf_python.niggli_lat_id import niggli_id
    from opf_python.pyniggli import reduced_cell
    import numpy as np

    lat_name, nig_n, lat_fam, basis = niggli_id(U)
    Bu = reduced_cell(U)
    Nu = Bu.niggli
    Cu = Bu.C
    if nig_n in [31, 44]:
        basis = U

    Bo = reduced_cell(basis)
    No = Bo.niggli
    Co = Bo.C

    if not exact:
        ns, mult = find_volumes(nig_n, kpt)
    else:
        ns, mult = [kpt], 1.0

    count = 0
    spHNFs = []
    if nig_n == 3:
        from opf_python.sc import sc_3
        for n in ns:
            temp = sc_3(n)
            for t in temp:
                spHNFs.append(t)

    elif nig_n == 5:
        from opf_python.bcc import bcc_5
        for n in ns:
            temp = bcc_5(n)
            for t in temp:
                spHNFs.append(t)

    elif nig_n == 1:
        from opf_python.fcc import fcc_1
        for n in ns:
            temp = fcc_1(n)
            for t in temp:
                spHNFs.append(t)

    elif nig_n in [12, 22]:
        from opf_python.hx import hex_12, hex_22
        for n in ns:
            if nig_n == 12:
                temp = hex_12(n)
            else:
                temp = hex_22(n)
            if len(temp) > 1 and not exact:
                count += 1
                for t in temp:
                    spHNFs.append(t)
            elif exact:
                for t in temp:
                    spHNFs.append(t)
            if count == 5:
                break

    elif nig_n in [9, 4, 2, 24]:
        from opf_python.rhom import rhom_9_24, rhom_4_2
        for n in ns:
            if nig_n == 9 or nig_n == 24:
                temp = rhom_9_24(n)
            else:
                temp = rhom_4_2(n)
            if len(temp) > 1 and not exact:
                count += 1
                for t in temp:
                    spHNFs.append(t)
            elif exact:
                for t in temp:
                    spHNFs.append(t)
            if count == 5:
                break

    elif nig_n in [11, 21]:
        from opf_python.stet import stet_11, stet_21
        for n in ns:
            if nig_n == 11:
                temp = stet_11(n)
            else:
                temp = stet_21(n)
            if len(temp) > 1 and not exact:
                count += 1
                for t in temp:
                    spHNFs.append(t)
            elif exact:
                for t in temp:
                    spHNFs.append(t)
            if count == 5:
                break

    elif nig_n in [15, 7, 6, 18]:
        from opf_python.body_tet import body_tet_6_7_15_18
        for n in ns:
            temp = body_tet_6_7_15_18(n)
            if len(temp) > 1 and not exact:
                count += 1
                for t in temp:
                    spHNFs.append(t)
            elif exact:
                for t in temp:
                    spHNFs.append(t)
            if count == 5:
                break

    elif nig_n == 32:
        from opf_python.so import so_32
        for n in ns:
            temp = so_32(n)
            if len(temp) > 1 and not exact:
                count += 1
                for t in temp:
                    spHNFs.append(t)
            elif exact:
                for t in temp:
                    spHNFs.append(t)
            if count == 5:
                break

    elif nig_n in [
            38,
            13,
            23,
            40,
            36,
    ]:
        from opf_python.base_ortho import base_ortho_38_13, base_ortho_23, base_ortho_36, base_ortho_40
        for n in ns:
            if nig_n == 23:
                temp = base_ortho_23(n)
            elif nig_n == 36:
                temp = base_ortho_36(n)
            elif nig_n == 40:
                temp = base_ortho_40(n)
            else:
                temp = base_ortho_38_13(n)
            if len(temp) > 1 and not exact:
                count += 1
                for t in temp:
                    spHNFs.append(t)
            elif exact:
                for t in temp:
                    spHNFs.append(t)
            if count == 5:
                break

    elif nig_n in [19, 8, 42]:
        from opf_python.body_ortho import body_ortho_19, body_ortho_8, body_ortho_42
        for n in ns:
            if nig_n == 19:
                temp = body_ortho_19(n)
            elif nig_n == 8:
                temp = body_ortho_8(n)
            else:
                temp = body_ortho_42(n)
            if len(temp) > 1 and not exact:
                count += 1
                for t in temp:
                    spHNFs.append(t)
            elif exact:
                for t in temp:
                    spHNFs.append(t)
            if count == 5:
                break

    elif nig_n in [26, 16]:
        from opf_python.face_ortho import face_ortho_26, face_ortho_16
        for n in ns:
            if nig_n == 26:
                temp = face_ortho_26(n)
            else:
                temp = face_ortho_16(n)
            if len(temp) > 1 and not exact:
                count += 1
                for t in temp:
                    spHNFs.append(t)
            elif exact:
                for t in temp:
                    spHNFs.append(t)
            if count == 5:
                break

    elif nig_n in [33, 34, 35]:
        from opf_python.sm import sm_33, sm_34, sm_35
        for n in ns:
            if nig_n == 33:
                temp = sm_33(n)
            elif nig_n == 34:
                temp = sm_34(n)
            else:
                temp = sm_35(n)
            if len(temp) > 1 and not exact:
                count += 1
                for t in temp:
                    spHNFs.append(t)
            elif exact:
                for t in temp:
                    spHNFs.append(t)
            if count == 5:
                break

    elif nig_n in [14, 10, 17, 20, 25, 27, 28, 29, 30, 41, 37, 39, 43]:
        from opf_python.base_mono import base_mono_28, base_mono_43, base_mono_20_25, base_mono_29_30, base_mono_10_14_17_27_37_39_41
        for n in ns:
            if nig_n == 28:
                temp = base_mono_28(n)
            elif nig_n == 43:
                temp = base_mono_43(n)
            elif nig_n in [20, 25]:
                temp = base_mono_20_25(n)
            elif nig_n in [29, 30]:
                temp = base_mono_29_30(n)
            else:
                temp = base_mono_10_14_17_27_37_39_41(n)
            if len(temp) > 1 and not exact:
                count += 1
                for t in temp:
                    spHNFs.append(t)
            elif exact:
                for t in temp:
                    spHNFs.append(t)
            if count == 5:
                break

    elif nig_n in [31, 44]:
        for n in ns:
            diags = get_HNF_diagonals(n)
            for diag in diags:
                a = diag[0]
                c = diag[1]
                f = diag[2]
                for b in range(c):
                    for d in range(f):
                        for e in range(f):
                            HNF = np.array([[a, 0, 0], [b, c, 0], [d, e, f]])
                            spHNFs.append(HNF * mult)
                            count += 1

    else:  # pragma: no cover
        raise ValueError("ERROR: unrecognized lattice type")

    supercells = transform_supercells(spHNFs, No, Nu, Co, Cu, basis)

    return supercells