% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/AllGenerics.R, R/getMethods.R, R/setMethods.R
\title{Matrix representation of null model}

nullMatrix(object) <- value


\S4method{nullMatrix}{deSet}(object) <- value
\item{object}{\code{S4 object}: \code{\linkS4class{deSet}}}

\item{value}{\code{matrix}: null model matrix where columns are covariates
and rows are observations}
\code{nullMatrix} returns the value of the null model matrix.
These generic functions access and set the null matrix for
\code{\linkS4class{deSet}} object.
# import data
age <- kidney$age
sex <- kidney$sex
kidexpr <- kidney$kidexpr
cov <- data.frame(sex = sex, age = age)

# create models
null_model <- ~sex
full_model <- ~sex + ns(age, df = 4)

# create deSet object from data
de_obj <- build_models(data = kidexpr, cov = cov, null.model = null_model,
full.model = full_model)

# extract the null model as a matrix
mat_null <- nullMatrix(de_obj)

John Storey, Andrew Bass
\code{\linkS4class{deSet}}, \code{\link{fullModel}} and