Extracting pieces of a AbstractRecurrenceMatrix

Hello there. I am working in a new way to calculate some RQA quantifiers and, for this purpose, I need to extract some smaller sets of the Recurrence Matrix (RM). I have implemented this in my own code, however I would like to integrate it with DynamicalSystems to use its high speed. In my code, I have defined a RecurrencePlot (RP) as a Array{Bool, 2} and, hence, extracting a smaller block reduces to RP[1:3, 1:3] (for example). Thus, I was expecting that something like RM = RecurrenceMatrix(mapp, e) micro = RM[1:3, 1:3] would return micro as the same type of RM. However, when I do this, I get: typeof(micro) >> SparseArrays.SparseMatrixCSC{Bool,Int64} And this does not allow me to use determinism(micro), for the RQA quantifiers only accept ::AbstractRecurrenceMatrix. Hence, I looked for the documentation of ::AbstractRecurrenceMatrix to see whether I could somehow get my micro to be the same type as RM, but this search was unsuccessful. Is there a way to do this or could this feature somehow be implemented?

It has occured to me that I could get the variable micro the way I want if I do the following: micro = CrossRecurrenceMatrix(mapp[1:3], mapp[1:3], e) However this implies that the whole calculation of the matrix will be made every single time and I was looking for a simpler way to do this, such as the one I mentioned or, at least, not as expensive computationally. I also realize the @windowed macro does something of the fashion, but not quite what I need.