Calculates the number of different directed acyclic graphs for a set of discrete and continuous nodes.
an integer, which gives the number of discrete nodes.
an integer, which gives the number of continuous nodes.
No arrows are allowed from continuous nodes to discrete nodes. Cycles are not allowed. The number of networks is given by Bottcher (2003), using the result in Robinson (1977).
When nd+nc>15, the procedure is quite slow.
A numeric containing the number of directed acyclic graphs with the given node configuration.
Susanne Gammelgaard Bottcher,
Claus Dethlefsen firstname.lastname@example.org.
Bottcher, S.G. (2003). Learning Conditional Gaussian Networks. Aalborg University, 2003.
Robinson, R.W. (1977). Counting unlabeled acyclic digraphs, Lecture Notes in Mathematics, 622: Combinatorial Mathematics.
numbermixed(2,2) ## Not run: numbermixed(5,10)
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