# [R] truncation and approximation

alfonso.carfora at uniparthenope.it alfonso.carfora at uniparthenope.it
Thu Jul 18 11:48:19 CEST 2013

```Maybe you can use "round" and "trunc" functions

For example if you have a vector like this:

x<- c(3.000 3.125 3.250 3.375 3.500 3.625 3.750 3.875 4.000)

and you want to round the numbers to 2 decimals you can use:

> round(x,2)
[1] 3.00 3.12 3.25 3.38 3.50 3.62 3.75 3.88 4.00

if you want a numeric vector containing the integers formed by
truncating the values in x

> trunc(x)
[1] 3 3 3 3 3 3 3 3 4

I'hope it'is useful to you
A.C.

> Hello,
>
> As for truncation, you can write a one line function:
>
> dec_trunc <- function(x, digits = 0) trunc(x * 10^digits)/10^digits
>
>
> As for approximation, maybe you're looking for ?signif.
>
> Hope this helps,
>
>
> Em 17-07-2013 18:41, Francesco Miranda escreveu:
>> What is the function to do the truncation to a certain decimal
>> digit of a number. And the function approximation?
>> Thanks.
>> Francesco M
>> 	[[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> and provide commented, minimal, self-contained, reproducible code.
>

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