R Under development (unstable) (2023-11-28 r85645 ucrt) -- "Unsuffered Consequences"
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> library(cpr)
> 
> # test that knot_expr
> bmat <- bsplines(mtcars$hp, df = 8)
> ke <- cpr:::knot_expr.cpr_bs(bmat, digits = 1)
> 
> stopifnot(isTRUE(all.equal(ke$xi_expr[[4]], bquote(xi[7]))))
> 
> ################################################################################
> ##                                End of File                                 ##
> ################################################################################
> 
> proc.time()
   user  system elapsed 
   0.25    0.09    0.32