R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  c o  n v . r  Test suite
> ##
> 
> 
> conv <- pracma::conv
> deconv <- pracma::deconv
> 
> all.equal(conv(c(1, 1, 1), 1), c(1, 1, 1))
[1] TRUE
> all.equal(conv(c(1, 1, 1), c(0, 0, 1)), c(0, 0, 1, 1, 1))
[1] TRUE
> all.equal(conv(c(-0.5, 1, -1), c(0.5, 0, 1)), c(-0.25, 0.5, -1, 1, -1))
[1] TRUE
> 
> b <- c(-0.25, 0.5, -1, 1, -1)
> a <- c(0.5, 0, 1)
> d <- deconv(b, a)
> all.equal(d$q, c(-0.5, 1, -1))
[1] TRUE
> all.equal(d$r, c(0, 0))
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.10    0.06    0.15