Python mio.loadmat函数代码示例

def test_str_round():
    # from report by Angus McMorland on mailing list 3 May 2010
    stream = BytesIO()
    in_arr = np.array(['Hello', 'Foob'])
    out_arr = np.array(['Hello', 'Foob '])
    savemat(stream, dict(a=in_arr))
    res = loadmat(stream)
    # resulted in ['HloolFoa', 'elWrdobr']
    assert_array_equal(res['a'], out_arr)
    stream.truncate(0)
    stream.seek(0)
    # Make Fortran ordered version of string
    in_str = in_arr.tostring(order='F')
    in_from_str = np.ndarray(shape=a.shape,
                             dtype=in_arr.dtype,
                             order='F',
                             buffer=in_str)
    savemat(stream, dict(a=in_from_str))
    assert_array_equal(res['a'], out_arr)
    # unicode save did lead to buffer too small error
    stream.truncate(0)
    stream.seek(0)
    in_arr_u = in_arr.astype('U')
    out_arr_u = out_arr.astype('U')
    savemat(stream, {'a': in_arr_u})
    res = loadmat(stream)
    assert_array_equal(res['a'], out_arr_u)

def plot_gaps(name, axis):
    """Takes the file name and coordinate axis and plots the marker gaps"""
    runDict = {}
    # load the matlab data file into a dictionary
    mio.loadmat(name, mdict=runDict)
    # name the rider depending on the filename
    if name[0] == '1':
        rider = 'Jodi'
        runDict['gearing']=runDict['gear']
    elif name[0] == '2':
        rider = 'Victor'
    else:
        rider = 'Jason'
    speed = np.average(runDict['V'])
    # only look at one marker dimension (i.e. 'xori')
    v = np.isnan(runDict[axis])
    # set the figure size
    fig = figure(1, figsize=(15., 9.))
    matshow(v.T, fignum=1, aspect='auto', cmap=cm.gray)
    yticks(range(np.shape(v)[1]), labels)
    xlabel('Sample Number')
    ylabel('Marker gaps in the {axis} coordinate'.format(axis=axis[0]))
    title(('File: {name}, {rider} riding the {bike} at {speed} km/h while' +
            ' {condition} in gear {gear}').format(name=name, rider=rider, bike=runDict['bike'][0],
                speed=str(speed), condition=runDict['condition'][0],
                gear=runDict['gearing'][0][0]))
    fig.savefig('gapImages/'+name[0:-4]+axis[0]+'.png')
    show()

def create_Q_matrix(kappa, folder, ridge=1e-6):
    GiCG = loadmat(folder + "GiCG.mat")["GiCG"]
    G = loadmat(folder + "G.mat")["G"]
    C0 = loadmat(folder + "C0.mat")["C0"]
    
    Q = GiCG + 2 * (kappa ** 2) * G + (kappa ** 4) * C0
    return Q + eye(Q.shape[0], Q.shape[1]) * ridge

def test_compression():
    arr = np.zeros(100).reshape((5,20))
    arr[2,10] = 1
    stream = BytesIO()
    savemat(stream, {'arr':arr})
    raw_len = len(stream.getvalue())
    vals = loadmat(stream)
    yield assert_array_equal, vals['arr'], arr
    stream = BytesIO()
    savemat(stream, {'arr':arr}, do_compression=True)
    compressed_len = len(stream.getvalue())
    vals = loadmat(stream)
    yield assert_array_equal, vals['arr'], arr
    yield assert_, raw_len > compressed_len
    # Concatenate, test later
    arr2 = arr.copy()
    arr2[0,0] = 1
    stream = BytesIO()
    savemat(stream, {'arr':arr, 'arr2':arr2}, do_compression=False)
    vals = loadmat(stream)
    yield assert_array_equal, vals['arr2'], arr2
    stream = BytesIO()
    savemat(stream, {'arr':arr, 'arr2':arr2}, do_compression=True)
    vals = loadmat(stream)
    yield assert_array_equal, vals['arr2'], arr2

def test_1d_shape():
    # Current 5 behavior is 1D -> column vector
    arr = np.arange(5)
    stream = StringIO()
    savemat(stream, {'oned':arr}, format='5')
    vals = loadmat(stream)
    yield assert_equal, vals['oned'].shape, (5,1)
    # Current 4 behavior is 1D -> row vector
    arr = np.arange(5)
    stream = StringIO()
    savemat(stream, {'oned':arr}, format='4')
    vals = loadmat(stream)
    yield assert_equal, vals['oned'].shape, (1, 5)
    for format in ('4', '5'):
        # can be explicitly 'column' for oned_as
        stream = StringIO()
        savemat(stream, {'oned':arr}, 
                format=format,
                oned_as='column')
        vals = loadmat(stream)
        yield assert_equal, vals['oned'].shape, (5,1)
        # but different from 'row'
        stream = StringIO()
        savemat(stream, {'oned':arr}, 
                format=format,
                oned_as='row')
        vals = loadmat(stream)
        yield assert_equal, vals['oned'].shape, (1,5)

def test_1d_shape():
    # Current 5 behavior is 1D -> column vector
    arr = np.arange(5)
    stream = BytesIO()
    warn_ctx = WarningManager()
    warn_ctx.__enter__()
    try:
        # silence warnings for tests
        warnings.simplefilter('ignore')
        savemat(stream, {'oned':arr}, format='5')
        vals = loadmat(stream)
        assert_equal(vals['oned'].shape, (5,1))
        # Current 4 behavior is 1D -> row vector
        stream = BytesIO()
        savemat(stream, {'oned':arr}, format='4')
        vals = loadmat(stream)
        assert_equal(vals['oned'].shape, (1, 5))
        for format in ('4', '5'):
            # can be explicitly 'column' for oned_as
            stream = BytesIO()
            savemat(stream, {'oned':arr},
                    format=format,
                    oned_as='column')
            vals = loadmat(stream)
            assert_equal(vals['oned'].shape, (5,1))
            # but different from 'row'
            stream = BytesIO()
            savemat(stream, {'oned':arr},
                    format=format,
                    oned_as='row')
            vals = loadmat(stream)
            assert_equal(vals['oned'].shape, (1,5))
    finally:
        warn_ctx.__exit__()

def test_recarray():
    # check roundtrip of structured array
    dt = [('f1', 'f8'),
          ('f2', 'S10')]
    arr = np.zeros((2,), dtype=dt)
    arr[0]['f1'] = 0.5
    arr[0]['f2'] = 'python'
    arr[1]['f1'] = 99
    arr[1]['f2'] = 'not perl'
    stream = BytesIO()
    savemat(stream, {'arr': arr})
    d = loadmat(stream, struct_as_record=False)
    a20 = d['arr'][0,0]
    yield assert_equal, a20.f1, 0.5
    yield assert_equal, a20.f2, 'python'
    d = loadmat(stream, struct_as_record=True)
    a20 = d['arr'][0,0]
    yield assert_equal, a20['f1'], 0.5
    yield assert_equal, a20['f2'], 'python'
    # structs always come back as object types
    yield assert_equal, a20.dtype, np.dtype([('f1', 'O'),
                                             ('f2', 'O')])
    a21 = d['arr'].flat[1]
    yield assert_equal, a21['f1'], 99
    yield assert_equal, a21['f2'], 'not perl'

def test_multiple_open():
    # Ticket #1039, on Windows: check that files are not left open
    tmpdir = mkdtemp()
    try:
        x = dict(x=np.zeros((2, 2)))

        fname = pjoin(tmpdir, "a.mat")

        # Check that file is not left open
        savemat(fname, x)
        os.unlink(fname)
        savemat(fname, x)
        loadmat(fname)
        os.unlink(fname)

        # Check that stream is left open
        f = open(fname, 'wb')
        savemat(f, x)
        f.seek(0)
        f.close()

        f = open(fname, 'rb')
        loadmat(f)
        f.seek(0)
        f.close()
    finally:
        shutil.rmtree(tmpdir)

def test_mat_struct_squeeze():
    stream = BytesIO()
    in_d = {"st": {"one": 1, "two": 2}}
    savemat_future(stream, in_d)
    # no error without squeeze
    out_d = loadmat(stream, struct_as_record=False)
    # previous error was with squeeze, with mat_struct
    out_d = loadmat(stream, struct_as_record=False, squeeze_me=True)

def test_miutf8_for_miint8_compromise():
    # Check reader accepts ascii as miUTF8 for array names
    filename = pjoin(test_data_path, 'miutf8_array_name.mat')
    res = loadmat(filename)
    assert_equal(res['array_name'], [[1]])
    # mat file with non-ascii utf8 name raises error
    filename = pjoin(test_data_path, 'bad_miutf8_array_name.mat')
    with assert_raises(ValueError):
        loadmat(filename)

 def load_ozone_data():
     folder = OzonePosterior.get_data_folder()
     
     y = loadmat(folder + "y.mat")["y"][:, 0]
     assert(len(shape(y)) == 1)
     
     A = loadmat(folder + "A.mat")["A"]
     
     return y, A

 def create_Q_matrix(self, kappa):
     folder = OzonePosterior.get_data_folder()
     
     GiCG = loadmat(folder + "GiCG.mat")["GiCG"]
     G = loadmat(folder + "G.mat")["G"]
     C0 = loadmat(folder + "C0.mat")["C0"]
     
     Q = GiCG + 2 * (kappa ** 2) * G + (kappa ** 4) * C0
     return Q + eye(Q.shape[0], Q.shape[1]) * OzonePosterior.ridge

def load_ozone_data(folder):
    # actual observations
    y = loadmat(folder + "y.mat")["y"][:, 0]
    assert(y.ndim == 1)
    
    # triangulation of globe
    A = loadmat(folder + "A.mat")["A"]
    
    return y, A

def test_warnings():
    fname = pjoin(test_data_path, 'testdouble_7.1_GLNX86.mat')
    warnings.simplefilter('error')
    # This should not generate a warning
    mres = loadmat(fname, struct_as_record=True)
    # This neither
    mres = loadmat(fname, struct_as_record=False)
    # This should - because of deprecated system path search
    yield assert_raises, DeprecationWarning, find_mat_file, fname
    warnings.resetwarnings()

def test_miuint32_compromise():
    # Reader should accept miUINT32 for miINT32, but check signs
    # mat file with miUINT32 for miINT32, but OK values
    filename = pjoin(test_data_path, 'miuint32_for_miint32.mat')
    res = loadmat(filename)
    assert_equal(res['an_array'], np.arange(10)[None, :])
    # mat file with miUINT32 for miINT32, with negative value
    filename = pjoin(test_data_path, 'bad_miuint32.mat')
    with assert_raises(ValueError):
        loadmat(filename)