# [R] truehist and density plots

Cuvelier Etienne ecu at info.fundp.ac.be
Tue Apr 28 15:43:33 CEST 2009

```Perhaps like this :

temp =density(b[20:50])
truehist(b, ymax=max(temp\$y))
lines(temp)

Etienne

carol white a écrit :
> Consider a vector of 100 elements (attached files). then,
>
> truehist(b)
> lines(density(b[20:50]))
>
> How is it possible to have density plots of all subsets like b[20:50] within histogram (without exceeding the max of historgram on y axis)?
>
> Is it more clear?
>
> Best,
>
> --- On Tue, 4/28/09, Uwe Ligges <ligges at statistik.tu-dortmund.de> wrote:
> From: Uwe Ligges <ligges at statistik.tu-dortmund.de>
> Subject: Re: [R] truehist and density plots
> To: "carol white" <wht_crl at yahoo.com>
> Cc: r-help at stat.math.ethz.ch
> Date: Tuesday, April 28, 2009, 5:42 AM
>
>
> carol white wrote:
>> Hi,
>> I wanted to plot the histogram of a vector and then, plot the density
> function of subsets of the vector on the histogram. So I use truehist in MASS
> package and lines(density) as follows:
>> length(b) = 1000
>> truehist(b)
>> lines(density(b[1:100]))
>
>
> I do not undertsand what you mean. Can you please provide a *reproducible*
> example?
>
> Uwe Ligges
>
>
>> however the density plot of the first 100 points exceeds the max of y axis
> (see attached). how is it possible to make a graphics so that the density plot
> of the subsets doesn't go beyond the maximum of all points in the complete
> set?
>> Cheers,
>>
>> Carol
>>
>>
>>
>>
>>
>>
>>
>>
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>> and provide commented, minimal, self-contained, reproducible code.
>
>
>
>
>
>
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