Thank you everyone.
Try executing this:
replicate(100, length(hist(rnorm(100), nclass = 10)$counts))
I'm still not sure why the number of bins (classes) is not consistent. 
Thank in advance.

> Date: Wed, 4 Sep 2013 20:27:36 +0100
> From: ruipbarra...@sapo.pt
> To: pmassico...@hotmail.com
> CC: r-help@r-project.org
> Subject: Re: [R] Histogram
> 
> Hello,
> 
> See the arguments 'right' and 'include.lowest' of ?hist.
> To give what you want, try instead
> 
> h1 <- hist(1:10, 10)  # counts are 2, 1, 1, ...
> h2 <- hist(1:10, breaks = 0:10)  # all counts are 1
> 
> 
> and see the difference between h1 and h2, components 'breaks' and 'counts'.
> 
> Hope this helps,
> 
> Rui Barradas
> 
> Em 04-09-2013 19:34, philippe massicotte escreveu:
> > Hi everyone.
> > I'm currently translating some Matlab code into R. However, I realized that 
> > the hsit function produce different results in both languages.
> > in Matlab, hist(1:10, 10) will produce 10 bins with a count of 1 in each, 
> > but in R it will produce 9 classes with count of 2,1,1,1,1,1,1,1,1.
> > I'm a bit embarrassed to ask such question, but why R is not producing 10 
> > classes as requested?
> > Thanks in advance,Phil                                      
> >     [[alternative HTML version deleted]]
> >
> > ______________________________________________
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> > 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.
> >
                                          
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