| numbermixed {deal} | R Documentation |
The number of possible networks
Description
Calculates the number of different directed acyclic graphs for a set of discrete and continuous nodes.
Usage
numbermixed(nd,nc)
Arguments
nd |
an integer, which gives the number of discrete nodes. |
nc |
an integer, which gives the number of continuous nodes. |
Details
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.
Value
A numeric containing the number of directed acyclic graphs with the given node configuration.
Author(s)
Susanne Gammelgaard Bottcher,
Claus Dethlefsen rpackage.deal@gmail.com.
References
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.
Examples
numbermixed(2,2)
## Not run: numbermixed(5,10)