numeric.md

c(1.5, -32.43)
#> [1]   1.50 -32.43
1.234567
#> [1] 1.234567
-2e34
#> [1] -2e+34
as.numeric(c("12", "3.45"))
#> [1] 12.00  3.45

Inf
#> [1] Inf
NaN
#> [1] NaN

NA_real_
#> [1] NA

^{Created on 2020-03-03 by the reprex package (v0.3.0)}