[R] Regular Expressions in grep - Solution and function to determine significant figures of a number

[Bert Gunter]

...

On Wed, Aug 22, 2012 at 12:46 PM, Dr. Holger van Lishaut
<H.v.Lishaut at gmx.de> wrote:
> Dear all,
>
> regmatches works.
>
> And, since this has been asked here before:
>
> SignifStellen<-function(x){
>     strx=as.character(x)
>     nchar(regmatches(strx, regexpr("[1-9][0-9]*\\.[0-9]*[1-9]",strx)))-1
> }
>
> returns the significant figures of a number. Perhaps this can help someone.

except that ?signif already does this, no?

-- Bert

>
> Thanks & best regards
> H. van Lishaut



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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