R Under development (unstable) (2024-08-28 r87069 ucrt) -- "Unsuffered Consequences"
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> suppressMessages(library("circular"))
> # ?median.circular
> 
> 
>   med <- median.circular(circular(c(0, pi/2, pi, 3/2*pi)))
> 
> ## expect:
> ## median is equal to NA
>   stopifnot(
+     is.na(med)
+   )
> 
> ## expect:
> ## all the points are minimizers of the function
>   stopifnot(
+     all.equal(attr(med, "medians"), c(0, pi/2, pi, 3/2*pi), tol = 2e-7)
+   )
> 
> 
> proc.time()
   user  system elapsed 
   0.20    0.09    0.28