Export basis functions in vectorized form

[kamensky]

If the grid that you’re evaluating basis functions on is (or can be) represented as a DOLFIN Mesh, then you can use the PETScDMCollection functionality to do this. I wrote up a short example of this in the following thread:

Project matrix from one function space to another function space

I’m not quite sure what you mean, but it sounds like maybe you’re looking for something like the PETScDMCollection functionality. Take a look at the following example: from dolfin import * # Two different meshes and function spaces: mesh1 = UnitIntervalMesh(7) mesh2 = UnitIntervalMesh(100) V1 = FunctionSpace(mesh1,"Lagrange",1) V2 = FunctionSpace(mesh2,"Lagrange",1) # Create some function in V1: f1 = Function(V1) f1.interpolate(Expression("x[0]*x[0]",degree=2)) # Create a transfer matrix fr…

Each row of the matrix A gives the evaluations of all basis functions from the space V1 at a node from the space V2.