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2025-01-12 00:52:51 +08:00
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)
}