/usr/lib/R/library/Matrix/data/USCounties.R

stopifnot(requireNamespace("Matrix" , quietly = TRUE)) # includes 'methods'

USCounties <-
    local({
        load(system.file(file.path("external", "USCounties_slots.rda"),
                         package = "Matrix"))
        ## -> 'L'
        r <- methods::new("dsCMatrix")
        `slot<-` <- methods::`slot<-`
        for (n in c("Dim", "i","p","x"))
            slot(r, n) <- L[[n]]
        r
    })

## The reverse:
if(FALSE) {
 L <- list()
 for (n in c("Dim", "i","p","x"))    L[[n]] <- slot(USCounties, n)
}

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