Aggreagation in Space-Time Problems

[diliphridya]

@fverdugo @santiagobadia
When dealing with space-time AgFEM, how can we aggregate only in space and not time ?

[santiagobadia]

Based on the comments so far, I would define first a mask that tells you which faces are suitable for aggregation at each cell. Then, I would generate a global array with this info, using, e.g., Fill(mask,num_cells), and finally, I would create a new array that combines the standard cell_faces and this one to provide you a new cell_faces_after_filter. Next, you can use everything you need. I can provide details about ho to do this.