FIPY：Grid2D cellToFaceDistanceVectors 的问题给出错误 'UniformGrid2D' object has no attribute '_cellToFaceDistanceVectors'

Question

我使用 Grid2D 创建网格如下

L = 2.
N = 50
dL = L/N
mesh = Grid2D(nx=N, ny=N, dx=dL, dy=dL)

但是当我尝试让单元格面对距离向量时：

mesh.cellToFaceDistanceVectors

出现以下错误：

AttributeError                            Traceback (most recent call last)

<ipython-input-7-9ab623a3d90d> in <module>()
----> 1 mesh.cellToFaceDistanceVectors

/usr/local/lib/python3.6/dist-packages/fipy/meshes/abstractMesh.py in <lambda>(s)
     96                             rank=1)
     97 
---> 98     cellToFaceDistanceVectors  = property(lambda s: s._cellToFaceDistanceVectors)
     99     cellDistanceVectors        = property(lambda s: s._cellDistanceVectors)
    100     cellVolumes                = property(lambda s: s._scaledCellVolumes)

AttributeError: 'UniformGrid2D' object has no attribute '_cellToFaceDistanceVectors'

其他属性也是如此，例如：

mesh.cellDistanceVectors

有人知道我怎样才能得到人脸到单元格的距离向量吗？

Answer 1

我们似乎从未为 Grids 实现过该功能，而且我似乎从未对 Robin 讨论进行过多测试。我已经提交了 issue.

作为解决方法，您可以这样做

from fipy.tools import numerix
MA = numerix.MA

tmp = MA.repeat(mesh._faceCenters[..., numerix.NewAxis,:], 2, 1)
cellToFaceDistanceVectors = tmp - numerix.take(mesh._cellCenters, mesh.faceCellIDs, axis=1)

tmp = numerix.take(mesh._cellCenters, mesh.faceCellIDs, axis=1)
tmp = tmp[..., 1,:] - tmp[..., 0,:]
cellDistanceVectors = MA.filled(MA.where(MA.getmaskarray(tmp), cellToFaceDistanceVectors[:, 0], tmp))

FIPY：Grid2D cellToFaceDistanceVectors 的问题给出错误 'UniformGrid2D' object has no attribute '_cellToFaceDistanceVectors'

FIPY: problem with Grid2D cellToFaceDistanceVectors gives error 'UniformGrid2D' object has no attribute '_cellToFaceDistanceVectors'

mesh

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