Although stan lets me declare a matrix[0,2] data object, I can’t seem to pass such an object to rstan. Is there some trick, or am I just asking too much? :)
For some reason, when conditions in R caused the matrix to have 0 rows, it also changed from numeric to logical entries. Forcing it back to numeric with matrix(as.numeric(myobject),ncol=2) resolved the problem of passing data to stan.
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Thanks for writing back with the solution.