R help - Feb 2010 - Rounding like in finances

Hello,

I need to have a "kaufmaennisches Runden" function.

Is there already something like that?

It means: rounding up the 5, instead of rounding it down.

So, 245.455 would give 245.46

I found no option for this.
Maybe there is a package for it?


Oliver

round(245.455, 2) ?

On Mon, Feb 22, 2010 at 11:06 AM, Oliver <oliver at first.in-berlin.de>
wrote:
> Hello,
>
> I need to have a "kaufmaennisches Runden" function.
>
> Is there already something like that?
>
> It means: rounding up the 5, instead of rounding it down.
>
> So, 245.455 would give 245.46
>
> I found no option for this.
> Maybe there is a package for it?
>
>
> Oliver
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O

Oh strange...

> round(108.275 , 2)
[1] 108.28
> round(208.275 , 2)
[1] 208.28
> round(308.275 , 2)
[1] 308.27
> 

looks not like what one should expect...


R version 2.9.2 (2009-08-24)



Ciao,
   Oliver

On 22/02/2010 9:06 AM, Oliver wrote:
> Hello,
>
> I need to have a "kaufmaennisches Runden" function.
>
> Is there already something like that?
>
> It means: rounding up the 5, instead of rounding it down.
>
> So, 245.455 would give 245.46
>
> I found no option for this.
> Maybe there is a package for it?
This is a little tricky, because 245.455 is not a representable number 
in base R.  If x is represented as x+epsilon, it will tend to round up, 
if it is x-epsilon, it will tend to round down.  (I say tend to because 
R tries to do banker's rounding, and the math routines attempt to do 
exact calculations even when they are not really possible, so it is hard 
to predict exactly what will happen for a particular number.) There are 
packages for handling rational numbers that could handle it exactly; I 
don't know how flexible they are about rounding.

Duncan Murdoch

same result with R2.10.1 on Windows...

Le 2/22/2010 15:34, Oliver a ?crit :
> Oh strange...
>
>
>    
>> round(108.275 , 2)
>>      
> [1] 108.28
>    
>> round(208.275 , 2)
>>      
> [1] 208.28
>    
>> round(308.275 , 2)
>>      
> [1] 308.27
>    
>>      
>
> looks not like what one should expect...
>
>
> R version 2.9.2 (2009-08-24)
>
>
>
> Ciao,
>     Oliver
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>    
-- 
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Institut und Museum
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra at uni-hamburg.de

**********
http://www.for771.uni-bonn.de
http://webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php

Hello,


which packages are you talking about?

And... are thoise packages using integer-based calculations?