Replace indexing block model structure with linear algebra? #154
Description
We currently let users have block models based on known group identities, using a syntax like:
B[group[i], group[j]]
Better would be to give i and j simplices, W[i] and W[j], which can be binary indicators for known data and parameter vectors if missing. Then we have:
W[i] B T(W[j])
in place of B[group[i], group[j]].
Credit: This was suggested by an anonymous reviewer at Royal Society Open Science.