Nothing

```
## numbermixed.R
## Author : Claus Dethlefsen
## Created On : Sat Mar 02 11:37:20 2002
## Last Modified By: Claus Dethlefsen
## Last Modified On: Thu Jul 24 09:56:07 2003
## Update Count : 24
## Status : Unknown, Use with caution!
###############################################################################
##
## Copyright (C) 2002 Susanne Gammelgaard Bottcher, Claus Dethlefsen
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
######################################################################
numbermixed <- function(nd,nc) {
## number of mixed networks with nd discrete and nc continuous nodes
## (see Bottcher (2002))
robinson <- function(n) {
## The Robinson (1977) recursive formula for the number of possible
## DAGs that contain n nodes
if (n<=1) return(1)
else {
res <- 0
for (i in 1:n) {
res <- res + (-1)^(i+1) * choose(n,i) * 2^(i*(n-i)) * Recall(n-i)
}
}
res
}
robinson(nd)*robinson(nc)*2^(nd*nc)
}
```

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