Hello, I can define spatially varying parameters using Expression like this: E = Expression("E0*x[0]", E0=2, degree=0) How can I do that discretely throughout the domain? I mean it is like: if x[0]<1 E=1 else E=2

If your expression is simple you could also use C++'s ternary operator something like: E = Expression("(x[0] < 1.0) ? E1 : E2", E1=E1, E2=E2, degree=0) Ideally you could use the functional syntax of dolfinx.

Spatially varying parameters

I/O

dokken December 8, 2022, 10:12am 2

Consider How to implement function with condition? - #3 by dokken

1 Like

Topic		Replies	Views
How to create piecewise expression based on value of a spatially varying function? variational formulation	2	803	July 14, 2021
Expression in fenicsx General	3	1043	February 15, 2023
Extracting value of the Expression I/O	5	551	November 19, 2024
Reactive terms that depend on the value of the field variables and other condition variational formulation	4	927	April 20, 2021
Dolfinx discontinous expression dolfinx	9	3659	May 18, 2022

Spatially varying parameters

Related topics