I am trying to construct a grid of plots, similar to facets, but where the rows and columns are associated with different channel-value mappings, and possibly also different marks along the diagonal.
Specifically, I would like to produce the equivalent of a seaborn pairplot. I feel like there should be a clever way to accomplish this with the existing facets, but I haven’t found it yet. Vegalite has a concept of repetition that is distinct from facets to support this.
I couldn’t find an existing solution with search, but has anyone already made progress on this type of plot?