Is this the intended behavior? (To disallow matrix types in the group_by operation within a data.frame). This was working in 0.1.1 but not in 0.1.2
If so, what is the recommended workaround? My use case is similar to "Run a regression on each group" where the user specifies the regressors. It is much more efficient to split the design matrix than it is to create a new one for each group.
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It is the intended behavior. If we introduce support for matrix columns we'll need to do a lot of extra testing. If this is something that you were interested in, supplying test cases would be very useful.