\name{apset2descdb}
\alias{apset2descdb}
\title{
\code{APset} to list-style AP database
}
\description{
Coerces APset to old list-style descriptor database used by search/cluster functions.
}
\usage{
apset2descdb(apset)
}
\arguments{
  \item{apset}{
Object of class \code{apset}
}
}
\details{
...
}
\value{
\item{list}{ with following components }
\item{descdb}{ list of atom pair sets }
\item{cids}{ compound IDs }
\item{sdfsegs}{ start/end coordinates for each molecule in SD file; only populated when \code{cmp.parse} is used for import }
\item{source}{ path/name of SD file }
\item{type}{ import method }
}
\references{
Chen X and Reynolds CH (2002). "Performance of similarity measures
in 2D fragment-based similarity searching: comparison of structural descriptors
and similarity coefficients", J Chem Inf Comput Sci.
}
\author{
Thomas Girke
}
\seealso{
Functions: \code{SDF2apcmp}, \code{sdf2ap}, \code{cmp.search}, \code{cmp.similarity}
}
\examples{
## Instance of SDFset class
data(sdfsample)
sdfset <- sdfsample[1:50]
sdf <- sdfsample[[1]]

## Compute atom pair library
ap <- sdf2ap(sdf)
(apset <- sdf2ap(sdfset))
view(apset[1:4])

## Return main components of APset object
cid(apset[1:4]) # compound IDs
ap(apset[1:4]) # atom pair descriptors

## Return atom pairs in human readable format
db.explain(apset[1]) 

## Coerce APset to other objects 
apset2descdb(apset) # returns old list-style AP database
tmp <- as(apset, "list") # returns list
as(tmp, "APset") # converst list back to APset

## Compound similarity searching with APset
cmp.search(apset, apset[1], type=3, cutoff=0.2) 
plot(sdfset[names(cmp.search(apset, apset[6], type=2, cutoff=0.4))])

## Identify compounds with identical AP sets 
cmp.duplicated(apset, type=2)

## Structure similarity clustering 
cmp.cluster(db=apset, cutoff = c(0.65, 0.5))[1:20,]
}
\keyword{ utilities }