R Under development (unstable) (2026-07-26 r90304 ucrt) -- "Unsuffered Consequences"
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> library(BCodifSIS)
> 
> n <- 30
> p <- 6
> grid <- seq_len(n)
> X <- vapply(seq_len(p), function(j) {
+   sin(grid / (j + 1)) + cos(grid * j / 9)
+ }, numeric(n))
> y <- X[, 1] + 0.25 * sin(grid / 4)
> 
> fast <- bcodif_score(X[, 1], y)
> slow <- bcodif_score_slow(X[, 1], y)
> stopifnot(isTRUE(all.equal(fast, slow, tolerance = 1e-10)))
> 
> fit <- bcodif_sis(X, y, d = 3)
> stopifnot(inherits(fit, "bcodif_sis"))
> stopifnot(length(fit$ix) == 3)
> stopifnot(all(is.finite(fit$scores)))
> 
> qc <- quick_check()
> stopifnot(is.list(qc))
> stopifnot(qc$score_difference < 1e-10)
> 
> proc.time()
   user  system elapsed 
   0.40    0.03    0.42