Generating weight matrices for different derivatives simultaneously

[apt-get-nat]

Is there a way to get fd.weight_matrix to produce matrices for, say, [1,0] and [0,1] at the same time? Not as a sum, but as two different operations. Under the hood, it would just be different right hand sides for the same core RBF matrix-vector system for each stencil. Solving against multiple right hand sides as a tall, skinny matrix should be much faster than re-inverting the system in multiple fd.weight_matrix calls.

See e.g. Appendix B of Flyer, Barnett & Wicker 2016 https://doi.org/10.1016/j.jcp.2016.02.078 where they do it this way in their MATLAB implementation.

[treverhines]

There is not a way to do that, but I like the idea. I am trying to think of what the usage should look like. It seems like this should be implemented in a new function called weight_matrices, where specifying diffs=[[1, 0], [0, 1], [[2, 0], [0, 2]]] would be interpreted as requesting the matrices for d/dx, d/dy, and the Laplacian.

I am pretty immersed in another project right now, so I dont know when I will get around to this.