R Under development (unstable) (2024-02-14 r85901 ucrt) -- "Unsuffered Consequences"
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> library(cpr)
> 
> ################################################################################
> # test that matrix rank is as expected
> set.seed(42)
> mat <- matrix(rnorm(25000 * 120), nrow = 25000)
> stopifnot(identical(matrix_rank(mat), 120))
> 
> ################################################################################
> # test that matrix rank of a full rank bspline basis is as expected
> x <- runif(100, 0, 1)
> bmat <- bsplines(x = x, bknots = c(0, 1), df = 15)
> stopifnot(identical(matrix_rank(bmat), 15))
> 
> ################################################################################
> # test that matrix rank of a rank-deficient bspline basis
> bmat <- bsplines(x, bknots = c(0, 1), iknots = c(0.5, 0.5, 0.5, 0.5, 0.5))
> stopifnot(identical(ncol(bmat), 9L))
> stopifnot(identical(matrix_rank(bmat), 8))
> 
> ################################################################################
> ##                                End of File                                 ##
> ################################################################################
> 
> proc.time()
   user  system elapsed 
   1.14    0.04    1.18