[R] about histograms

[Petr Pikal]

Hi

On 23 Mar 2006 at 0:02, linda.s wrote:

Date sent:      	Thu, 23 Mar 2006 00:02:40 -0800
From:           	"linda.s" <samrobertsmith at gmail.com>
To:             	samrobertsmith at gmail.com
Copies to:      	R-help at stat.math.ethz.ch
Subject:        	[R] about histograms

> > x <- rnorm(1000)
> > hist(x)
> > hist(x,nclass=100)

>From help page

nclass numeric (integer). For S(-PLUS) compatibility only, nclass is 
equivalent to breaks for a scalar or character argument.

breaks one of: 
 a vector giving the breakpoints between histogram cells, 
 a single number giving the number of cells for the histogram, 
 ...

e.g. without breaks defined (or nclass) hist uses

hist(x, breaks = "Sturges", ...

I do not know details but number of breaks is definitely lower than 
100.

HTH
Petr



> The two histograms look different and check the help file but still
> confused... sorry if it is too simple. Linda
> 
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Petr Pikal
petr.pikal at precheza.cz