Python numpy 模块，vander() 实例源码
我们从Python开源项目中，提取了以下12个代码示例，用于说明如何使用numpy.vander()。
def ln_likelihood(p, joker_params, data):
P, phi0, ecc, omega, s, K, *v_terms = p
# a little repeated code here...
# phi0 now is implicitly relative to data.t_offset, not mjd=0
t = data._t_bmjd
zdot = rv_from_elements(times=t, P=P, K=1., e=ecc,
omega=omega, phi0=phi0,
anomaly_tol=joker_params.anomaly_tol)
# TODO: right now, we only support a single, global velocity trend!
A1 = np.vander(t, N=joker_params._n_trend, increasing=True)
A = np.hstack((zdot[:,None], A1))
p = np.array([K] + v_terms)
ivar = get_ivar(data, s)
dy = A.dot(p) - data.rv.value
return 0.5 * (-dy**2 * ivar - log_2pi + np.log(ivar))
def vander(x, n=None):
"""
Masked values in the input array result in rows of zeros.
"""
_vander = np.vander(x, n)
m = getmask(x)
if m is not nomask:
_vander[m] = 0
return _vander
def partial_dynamics(self, level, node=None):
"""
Return the time evolution of the specific `level` and of the specific
`node`; if `node` is not specified, the method returns the time evolution
of the given `level` (all the nodes).
:param int level: the index of the level from where the time evolution
is extracted.
:param int node: the index of the node from where the time evolution is
extracted; if None, the time evolution is extracted from all the
nodes of the given level. Default is None.
"""
def dynamic(eigs, amplitudes, step, nsamples):
omega = old_div(
np.log(np.power(eigs, old_div(1., step))),
self.original_time['dt']
)
partial_timestep = np.arange(nsamples) * self.dmd_time['dt']
vander = np.exp(np.multiply(*np.meshgrid(omega, partial_timestep)))
return (vander * amplitudes).T
if node:
indeces = [self._index_list(level, node)]
else:
indeces = [self._index_list(level, i) for i in range(2**level)]
level_dynamics = [
dynamic(
self._eigs[idx], self._b[idx], self._steps[idx],
self._nsamples[idx]
) for idx in indeces
]
return scipy.linalg.block_diag(*level_dynamics)
def design_matrix(nonlinear_p, data, joker_params):
"""
Parameters
----------
nonlinear_p : array_like
Array of non-linear parameter values. For the default case,
these are P (period, day), phi0 (phase at pericenter, rad),
ecc (eccentricity), omega (argument of perihelion, rad).
May also contain log(jitter^2) as the last index.
data : `~thejoker.data.RVData`
The observations.
joker_params : `~thejoker.sampler.params.JokerParams`
The specification of parameters to infer with The Joker.
Returns
-------
A : `numpy.ndarray`
The design matrix with shape ``(n_times, n_params)``.
"""
P, phi0, ecc, omega = nonlinear_p[:4] # we don't need the jitter here
# phi0 now is implicitly relative to data.t_offset, not mjd=0
t = data._t_bmjd
zdot = rv_from_elements(times=t, P=P, K=1., e=ecc,
omega=omega, phi0=phi0,
anomaly_tol=joker_params.anomaly_tol)
# TODO: right now, we only support a single, global velocity trend!
A1 = np.vander(t, N=joker_params._n_trend, increasing=True)
A = np.hstack((zdot[:,None], A1))
return A
def vander(x, n=None):
"""
Masked values in the input array result in rows of zeros.
"""
_vander = np.vander(x, n)
m = getmask(x)
if m is not nomask:
_vander[m] = 0
return _vander
def detrend(y, order):
if order == -1:
return y
return OLS(y, np.vander(np.linspace(-1, 1, len(y)), order + 1)).fit().resid
def vander(x, n=None):
"""
Masked values in the input array result in rows of zeros.
"""
_vander = np.vander(x, n)
m = getmask(x)
if m is not nomask:
_vander[m] = 0
return _vander
def vander(x, n=None):
"""
Masked values in the input array result in rows of zeros.
"""
_vander = np.vander(x, n)
m = getmask(x)
if m is not nomask:
_vander[m] = 0
return _vander
def vander(x, n=None):
"""
Masked values in the input array result in rows of zeros.
"""
_vander = np.vander(x, n)
m = getmask(x)
if m is not nomask:
_vander[m] = 0
return _vander
def vander(x, n=None):
"""
Masked values in the input array result in rows of zeros.
"""
_vander = np.vander(x, n)
m = getmask(x)
if m is not nomask:
_vander[m] = 0
return _vander
def test_graph_laplacian():
for mat in (np.arange(10) * np.arange(10)[:, np.newaxis],
np.ones((7, 7)),
np.eye(19),
np.vander(np.arange(4)) + np.vander(np.arange(4)).T,):
sp_mat = sparse.csr_matrix(mat)
for normed in (True, False):
laplacian = graph_laplacian(mat, normed=normed)
n_nodes = mat.shape[0]
if not normed:
np.testing.assert_array_almost_equal(laplacian.sum(axis=0),
np.zeros(n_nodes))
np.testing.assert_array_almost_equal(laplacian.T, laplacian)
np.testing.assert_array_almost_equal(
laplacian, graph_laplacian(sp_mat, normed=normed).toarray())