data.frame does not support matrix types

[chrisconlon]

Consider the following example:

load(hflights)
hflights$taxi <- as.matrix(cbind(hflights$TaxiIn,hflights$TaxiOut))
grouped <- group_by(hflights,Year,Month)

Produces the error message:

Error: column 'taxi' has unsupported type

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.

[hadley]

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.