Hello, I am looking at the example
https://sgpp.sparsegrids.org/docs/example_predictiveRefinement_py.html

The trial function given looks like

It vanishes to 0 at the boundary (0-1) and there are no issues with the refinement. Although the function I need to make a sparse grid for looks like:

It is not 0 at the boundary. The problem is that SG++ places almost all of the refined points at the boundary (0.9999) and some far past it (4.29e9).

Most points at the boundary, 0.99999

Some points very far past it, 4.29e9

I tried making my function step to 0 outside the boundary but the same result happened. I believe it must smoothly transition to 0 outside the boundary. My function does not smoothly transition to 0 yet I need to sample it with SG++.

I am sure I am not the first person with this problem but I could not find an existing issue for it.

Any advice would be appreciated.

Daniel