R Under development (unstable) (2023-11-07 r85491 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  i n t e r p 1 . R Test suite
> ##
> 
> 
> interp1 <- pracma::interp1
> 
> x <- c(0.0, 0.5, 1.0, 1.5)
> y <- x^2
> xi <- c(0.25, 0.75, 1.25)
> 
> identical(interp1(x, y, xi, method="constant"), c(0.0, 0.25, 1.0))
[1] TRUE
> identical(interp1(x, y, xi, method="linear"),   c(0.125, 0.625, 1.625))
[1] TRUE
> identical(interp1(x, y, xi, method="nearest"),  c(0.25, 1.00, 2.25))
[1] TRUE
> identical(interp1(x, y, xi, method="spline"),   c(0.0625, 0.5625, 1.5625))
[1] FALSE
> 
> # Not yet implemented
> # identical(interp1(x, y, xi, method="cubic"),    c(0.0781, 0.5547, 1.5547))
> 
> proc.time()
   user  system elapsed 
   0.10    0.06    0.15