[R] Round down numeric values with decimals

[Bert Gunter]

This is *not* "rounding down."

But this should do it I think:
## (see ?floor)

x <- 3.896e09
k <- floor(log10(x))

> floor(x*10^(-k))*10^k
[1] 3e+09

There may be even slicker ways, but this is as slick as I can muster...

Cheers,
Bert



Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Tue, Sep 4, 2018 at 9:33 AM Nelly Reduan <nell.redu using hotmail.fr> wrote:

> Hello,
>
>
>
> How can I round down numeric values with decimals? For example,
>
>
>
> > signif(3.896037e+09, digits = 1)
>
> [1] 4e+09
>
>
>
> The expected result is 3e+09 (and not 4e+09).
>
>
>
> > signif(8.68542378e-10, digits = 1)
>
> [1] 9e-10
>
>
>
> The expected result is 8e-10 (and not 9e-10).
>
>
>
> Thank you very much for your time.
>
> Have a nice day
>
> Nell
>
>
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>
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