R Under development (unstable) (2024-02-01 r85851 ucrt) -- "Unsuffered Consequences"
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> suppressMessages(library(cobs))
> 
> options(digits = 6)
> ## pdf("ex3.pdf")
> 
> data(women) # 15 obs.
> attach(women)
> 
> ## Interpolation! very easy problem,   BUT :
> try( ## gives  "ifl = 5" !!!!!
+ cobw <- cobs(weight, height, knots = weight, nknots = length(weight))
+ )
Warning message:
In cobs(weight, height, knots = weight, nknots = length(weight)) :
  The number of knots can't be equal to the number of unique x for degree = 2.
'cobs' has automatically deleted the middle knot.
> 
> cat('Time elapsed: ', proc.time(),'\n') # for ``statistical reasons''
Time elapsed:  1.62 0.26 1.85 NA NA 
> 
> proc.time()
   user  system elapsed 
   1.62    0.26    1.85