R Under development (unstable) (2024-02-14 r85901 ucrt) -- "Unsuffered Consequences"
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> library(cpr)
> 
> set.seed(42)
> x <- seq(0 + 1/5000, 6 - 1/5000, length.out = 100)
> bmat <- bsplines(x, iknots = c(1, 1.5, 2.3, 4, 4.5), bknots = c(0, 6))
> theta <- matrix(c(1, 0, 3.5, 4.2, 3.7, -0.5, -0.7, 2, 1.5), ncol = 1)
> DF <- data.frame(x = x, truth = as.numeric(bmat %*% theta))
> DF$y <- as.numeric(bmat %*% theta + rnorm(nrow(bmat), sd = 0.3))
> 
> initial_cp <-
+   cp(y ~ bsplines(x, iknots = c(1, 1.5, 2.3, 3.0, 4, 4.5), bknots = c(0, 6))
+      , data = DF
+      , keep_fit = TRUE # default is FALSE
+   )
> 
> cpr0 <- cpr(initial_cp)

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> s <- summary(cpr0)
> stopifnot(identical(nrow(s), 7L))
> stopifnot(identical(names(s), c("dfs", "n_iknots", "iknots", "loglik", "rss", "rse", "wiggle", "fdsc", "Pr(>w_(1))")))
> 
> stopifnot(isTRUE(
+   all.equal(summary(cpr0[[1]])
+             , s[1, c("dfs", "n_iknots", "iknots", "loglik", "rss", "rse", "wiggle", "fdsc")]
+             , check.attributes = FALSE
+ )))
> 
> stopifnot(identical(
+     attr(s, "elbow")
+     ,
+     structure(c(3, 3, 3, 3, 3, 3), dim = 2:3, dimnames = list(c("quadratic", "linear"), c("loglik", "rss", "rse")))
+     )
+ )
> 
> # verify that print returns the object
> printed <- print(s)
  dfs n_iknots       iknots    loglik       rss       rse    wiggle fdsc
1   4        0              -74.49596 25.977023 0.5201865  46.88727    2
2   5        1          4.5 -60.10762 19.481116 0.4528403  46.14794    2
3   6        2       1, 4.5 -22.06652  9.103178 0.3111950 113.07351    4
4   7        3    1, 3, 4.5 -19.96710  8.728863 0.3063637  99.28601    4
5   8        4 1, 1.5, .... -19.95694  8.727089 0.3079930  95.78576    4
6   9        5 1, 1.5, .... -19.79792  8.699377 0.3091885  92.01369    4
7  10        6 1, 1.5, .... -19.67424  8.677886 0.3105172  87.35118    4
  Pr(>w_(1))
1         NA
2 1.8203e-08
3 < 2.22e-16
4 9.6222e-05
5   0.630871
6   0.072342
7   0.066713

-------
Elbows (index of selected model):
          loglik rss rse
quadratic      3   3   3
linear         3   3   3
> stopifnot(identical(printed, s))
> 
> # only the first and last row:
> printed <- print(s, n = 1)
    dfs n_iknots       iknots            loglik              rss
1     4        0              -74.4959645891524 25.9770228656933
---                                                             
7    10        6 1, 1.5, .... -19.6742417303079 8.67788603091469
                  rse           wiggle fdsc Pr(>w_(1))
1   0.520186493658097 46.8872701952964    2         NA
---                                                   
7   0.310517239294459 87.3511819271172    4   0.066713

-------
Elbows (index of selected model):
          loglik rss rse
quadratic      3   3   3
linear         3   3   3
> stopifnot(identical(printed, s))
> 
> ################################################################################
> #                                 End of File                                  #
> ################################################################################
> 
> proc.time()
   user  system elapsed 
   1.98    0.14    2.10