Is it okay to use floating-point numbers as indices or when creating factors in R?

Question

Is it okay to use floating-point numbers as indices or when creating factors in R?

I don\'t mean numbers with decimal parts; that would clearly be odd, but instead n

Answer 1

Constructs such as 1:3 are really integers:

> class(1:3)
[1] "integer"

Using a float as an index entails apparently some truncation:

> foo <- 1:3
> foo
[1] 1 2 3
> foo[1.0]
[1] 1
> foo[1.5]
[1] 1