How to use the pyamg.gallery.stencil_grid function in pyamg
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raptor-library / raptor / examples / pyamg_basic.py View on Github 
import numpy as np
from pyamg import smoothed_aggregation_solver
from pyamg.gallery import stencil_grid
from pyamg.gallery.diffusion import diffusion_stencil_2d
n=500
X,Y = np.meshgrid(np.linspace(0,1,n),np.linspace(0,1,n))
stencil = diffusion_stencil_2d(type='FE',epsilon=0.001,theta=np.pi/3)
A = stencil_grid(stencil, (n,n), format='csr')
from pyamg.gallery.laplacian import poisson
A = poisson( (n,n) , format ='csr')
b = np.random.rand(A.shape[0])
ml = smoothed_aggregation_solver(A,
B=X.reshape(n*n,1),
strength='symmetric',
aggregate='standard',
smooth=('jacobi', {'omega': 4.0/3.0,'degree':2}),
presmoother=('jacobi', {'omega': 4.0/3.0}),
postsmoother=('jacobi', {'omega': 4.0/3.0}),
Bimprove=None,
max_levels=10,
max_coarse=5,
keep=False)pyamg
PyAMG: Algebraic Multigrid Solvers in Python
