R help - May 2003 - problems with hist()

Hi,
I try to compute the counts of a histogram of random numbers. But I
get different results depending on the limits (-10,10) or (-1000,1000)
although all numbers are in the interval (-10,10).

Have I done somthing wrong? 

> x<-rnorm(1e6)
> s1<-hist(x, br =c(-1000,-1,-0.5,0,0.5,1,1000),plot=FALSE)[[2]]
> s2<-hist(x, br =c(-10,-1,-0.5,0,0.5,1,10),plot=FALSE)[[2]]
> sum(s1)
[1] 1000000
> sum(s2)
[1] 1000000
>  s1                                                        
[1] 159035 149461 192003 191478 149789 158234
> s2
[1] 159009 149452 192004 191464 149805 158266

Thanks
G?nter

As a last resort, try read the help page:

     A numerical tolerance of 1e-7 times the range of the breaks is
     applied when counting entries on the edges of bins. 

If you use a silly range, this will affect your results.


On Tue, 20 May 2003, Guenter Tirler wrote:
> Hi,
> I try to compute the counts of a histogram of random numbers. But I
> get different results depending on the limits (-10,10) or (-1000,1000)
> although all numbers are in the interval (-10,10).
> 
> Have I done somthing wrong? 
> 
> 
> > x<-rnorm(1e6)
> > s1<-hist(x, br =c(-1000,-1,-0.5,0,0.5,1,1000),plot=FALSE)[[2]]
> > s2<-hist(x, br =c(-10,-1,-0.5,0,0.5,1,10),plot=FALSE)[[2]]
> > sum(s1)
> [1] 1000000
> > sum(s2)
> [1] 1000000
> >  s1                                                        
> [1] 159035 149461 192003 191478 149789 158234
> > s2
> [1] 159009 149452 192004 191464 149805 158266
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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