[R] round() and negative digits

[Carl Witthoft]

On 10/8/11 6:11 PM, (Ted Harding) wrote:

> Carl Witthoft's serendipitous discovery is a nice example
> of how secrets can be guessed by wondering "what if ... ?".
> So probably you don;t need to tell the secrets.
>
> Taking the "negative digits" to their logical extreme:
>
>    round(654.321,2)
>    # [1] 654.32
>    round(654.321,1)
>    # [1] 654.3
>    round(654.321,0)
>    # [1] 654
>    round(654.321,-1)
>    # [1] 650
>    round(654.321,-2)
>    # [1] 700
>    round(654.321,-3)
>    # [1] 1000
>    round(654.321,-4)
>    # [1] 0
>
> which is what you'd logically expect (but is it what you
> would intuitively expect?).
>
Oh, oh, somebody's going all metaphysical on us.


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