R Under development (unstable) (2023-12-09 r85665 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(float))
> 
> ### Diag taker
> x = matrix(1:30, 10)
> y = matrix(1:10, 10, 2)
> z = matrix(1:5, 5, 3)
> 
> xs = fl(x)
> ys = fl(y)
> zs = fl(z)
> 
> 
> test = dbl(diag(xs))
> stopifnot(all.equal(test, diag(x)))
> 
> test = dbl(diag(ys))
> stopifnot(all.equal(test, diag(y)))
> 
> test = dbl(diag(zs))
> stopifnot(all.equal(test, diag(z)))
> 
> 
> 
> ### Diag maker
> tester = function(x, s)
+ {
+   truth = diag(x)
+   test = dbl(diag(s))
+   stopifnot(all.equal(test, truth))
+   
+   truth = diag(x, 3, 2)
+   test = dbl(diag(s, 3, 2))
+   stopifnot(all.equal(test, truth))
+   
+   truth = diag(x, 5, 5)
+   test = dbl(diag(s, 5, 5))
+   stopifnot(all.equal(test, truth))
+ }
> 
> 
> x = 1:4
> s = fl(x)
> tester(x, s)
> 
> x = c(3, 7)
> s = fl(x)
> tester(x, s)
> 
> proc.time()
   user  system elapsed 
   0.37    0.03    0.36