R Under development (unstable) (2024-04-23 r86473 ucrt) -- "Unsuffered Consequences"
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> library(sfsmisc)
> expo <- -3:4
> stopifnot(exprs = {
+     all.equal(pretty10exp(10^expo, drop.1=TRUE, sub10 = c(-2, 2)),
+               expression(10^-3, 0.01, 0.1, 1, 10, 100, 10^3, 10^4))
+ 
+     identical(pretty10exp(10^expo, drop.1=TRUE, sub10 = c(-2, 2), lab.type="latex"),
+               c("$10^{-3}$", "0.01", "0.1", "1", "10", "100",
+                 "$10^{3}$", "$10^{4}$"))
+     ## gave exponential format for "latex" case.
+ })
> 
> proc.time()
   user  system elapsed 
   0.14    0.09    0.17