R Under development (unstable) (2024-02-14 r85901 ucrt) -- "Unsuffered Consequences"
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> library(cpr)
> 
> acn <- cn(pdg ~ btensor(list(day, age)
+                         , df = list(10, 8)
+                         , bknots = list(c(-1, 1), c(44, 53))
+                         ) + ttm
+           , data = spdg)
> 
> cnr0 <- cnr(acn)

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> 
> s <- summary(cnr0)
> 
> stopifnot(inherits(s, "cpr_summary_cpr_cnr"))
> stopifnot(inherits(s, "data.frame"))
> 
> 
> # print method
> printed <- print(cnr0)
A list of control nets
List of 11
 - attr(*, "class")= chr [1:2] "cpr_cnr" "list"
> stopifnot(identical(printed, cnr0))
> 
> printed <- capture.output(print(cnr0))
> stopifnot(identical(length(printed), 3L))
> 
> ################################################################################
> #                                 End of File                                  #
> ################################################################################
> 
> proc.time()
   user  system elapsed 
   5.12    0.87    5.98