How to get array of minimum edge lengths for each cell


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1
4 months ago by
I want to get an array of floats whose length is equal to the number of cells, and gives the minimum edge length of each cell. Does the following give what I want ? Is there a more direct way to get this information ?
mesh = UnitSquareMesh(5,10)
V = FunctionSpace(mesh, 'DG', 0)
v = TestFunction(V)
a = assemble(MinCellEdgeLength(mesh)*v*dx)
b = assemble(v*dx)
h = a.array() / b.array()
print h​
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1 Answer


2
4 months ago by
Maybe you can iterate over cells and then find the shortest edges (?). Something like this:

import numpy as np

l = np.zeros(mesh.num_cells())
for c in cells(mesh):
  edges = c.entities(1)
  l[c.index()] = min([Edge(mesh, edges[0]).length(), \
                      Edge(mesh, edges[1]).length(), \
                      Edge(mesh, edges[2]).length()])​
1
Is this a bit more slick?

l = [min(edge.length() for edge in edges(cell)) for cell in cells(mesh)]



written 4 months ago by Nate  
yes, that looks nice!
written 4 months ago by Hernán Mella  
This is nice. Can you make it into an answer. Thanks.
written 4 months ago by Praveen C  
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