R Under development (unstable) (2024-06-20 r86796 ucrt) -- "Unsuffered Consequences"
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> require(salad)
Loading required package: salad

Attaching package: 'salad'

The following object is masked from 'package:stats':

    dnorm

> x <- dual( 1:4 + 0.1 )
> A <- matrix( c(x[1], x[2], x[2], x[3]), 2 )
> 
> # mb <- microbenchmark::microbenchmark( A[1], A[,1, drop = FALSE], A[1,], A[1,1], A[1,2] <- x[4], A[,1] <- x[1:2], times = 1000 )
> # print(mb)
> 
> proc.time()
   user  system elapsed 
   0.29    0.03    0.26