\name{db.subset}
\alias{db.subset}
\title{Subset a descriptor database and return a sub-database for the selected compounds}
\description{
'db.subset' will take a descriptor database generated by 'cmp.parse' and an
array of indecies, and return a new database for compounds
corresponding to these indecies. The returned value is a descriptor database as returned by the \code{\link{cmp.parse}} function.
}
\usage{
db.subset(db, cmps)
}
%- maybe also 'usage' for other objects documented here.
\arguments{
  \item{db}{The database generated by 'cmp.parse'}
  \item{cmps}{An array of indecies that correspond to a set of selected
	  compounds from the database}
}
\details{
	'db.subset' creates a sub-database from 'db' by only including
	infomration that is relevant to compounds indexed by 'cmps'.
}
\value{
	Return a descriptor database for the selected compounds. The format of the database is compatible with the one returned by \code{\link{cmp.parse}}.
}

\seealso{\code{\link{cmp.parse}}, \code{\link{sdf.subset}}}
\examples{
# load sample database from web
db <- cmp.parse("http://bioweb.ucr.edu/ChemMineV2/static/example_db.sdf")
# create a sub-database for the 1st and 2nd compound in that SDF
db_new <- db.subset(db, c(1, 2))
}
\keyword{utilities}