Nothing
vec <- function( x )
{
###
### this function returns a column vector that is a stack of the columns of x
###
### Parameters
### x = a numeric matrix
###
if ( !is.matrix( x ) ) {
stop( "argument x is not a matrix" )
}
if ( !is.numeric( x ) ) {
stop( "argument x is not a numeric matrix" )
}
return( t( t( as.vector( x ) ) ) )
}
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