AttributeError: 'set' object has no attribute 'set_all'

dolfinx
1

Hi Community,
I’m a truely new user for fenics. There are some promblem when i got using this software:The script is as follows

Mark boundary domains

boundaries = FacetFunction(‘double’, mesh, mesh.topology().dim()-1)
boundaries={0,1}
boundaries.set_all(0)
left.mark(boundaries, 1)
top.mark(boundaries, 2)
right.mark(boundaries, 3)
bottom.mark(boundaries, 4)
center.mark(boundaries, 5)

When I try to run the script, it tell me the function “FacetFunction” is not defined.
so I changed FacetFunction into MeshFunction.however a new error occured as follows

Traceback (most recent call last):
File “/home/ts313/Documents/phasefield/NHKTYPE1-DENS.py”, line 87, in
boundaries.set_all(0)
AttributeError: ‘set’ object has no attribute ‘set_all’

I don’t know how to fix this trouble.Sincerely appreciate for any help

2

First of all, you need to supply which version of FEniCS you are using (from the look of the code, you are running a version prior to 2017.2.0).
Secondly, you should use 3x` encapsulation to properly format code.

Finally, you are overwriting boundaries, which is the causing your error:

[quote="liuzherui, post:1, topic:7890"]
boundaries = FacetFunction(‘double’, mesh, mesh.topology().dim()-1)
boundaries={0,1}
[/quote]
you should rename the second variable here.
3

Thanks for your help.
I installed the fenics2016.2.0 on ubuntu 16.04. It finally worked very well.