R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  f i n d i n t e r v a l s . R  Test suite
> ##
> 
> findintervals <- pracma::findintervals
> 
> identical(findintervals(0, zapsmall(sin(seq(0, 10*pi, len=100)))),
+           as.integer(c(1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100)))
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.18    0.03    0.15