[R] Handing significance digits

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Fri May 28 13:36:22 CEST 2010

You can use round(value, 2)

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek
team Biometrie & Kwaliteitszorg
Gaverstraat 4
9500 Geraardsbergen

Research Institute for Nature and Forest
team Biometrics & Quality Assurance
Gaverstraat 4
9500 Geraardsbergen

tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
~ John Tukey

> -----Oorspronkelijk bericht-----
> Van: r-help-bounces op r-project.org 
> [mailto:r-help-bounces op r-project.org] Namens Christofer Bogaso
> Verzonden: vrijdag 28 mei 2010 12:51
> Aan: R-help op stat.math.ethz.ch
> Onderwerp: [R] Handing significance digits
> Hi folks, recently I was trying evaluation of some complex 
> function having exactly same starting values as well as same 
> algorithm in both R and .Net environment. However at the end 
> point I notice that there are some differences in the 
> reported figures from those two applications (as much as 
> 0.10%). I feel this is basically due to consideration of 
> different significance digits in handling floating point
> numbers between R and .Net.
> Therefore I want to fix the number of digits that should be 
> there after "."
> in each and every calculations in R. For example suppose I am 
> multiplying two numbers : 18.456 and 20.345. Ideally it 
> should come as 375.48732.
> However I want R to consider only 2 significant digits i.e. 
> 18.46 & 20.35 and reports 375.66 and should consider this 
> trimmed value for subsequent calculations.It would be good if 
> there is any possibility to define such behavior once at the 
> beginning of my R-session.
> Is there any way to do that?
> Thanks,
> 	[[alternative HTML version deleted]]
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