[R] How to draw a rect() behind a hist() ?

Ivan Calandra ivan.calandra at uni-hamburg.de
Wed Dec 1 10:10:32 CET 2010

```Hi,
For your second question, take a look at ?clip. The example explains
really well what you can do and how.
HTH,
Ivan

Le 12/1/2010 04:42, Peter Ehlers a écrit :
> On 2010-11-30 17:27, Jason Edgecombe wrote:
>> Hi,
>>
>> I have the following code:
>>
>> hist(gps\$heartpercent, breaks=5)
>> rect(90, par("usr")[3], 100, par("usr")[4], col = "red")
>>
>> How do I get the rectangle to appear behind the histogram. Barring that,
>> how can I make certain bars of the histogram to be a certain color?
>>
> Here are a couple of ways:
> 1. using hist(); just plot the histogram twice.
>
>  x <- rnorm(1000, 100, 5)
>  hist(x)
>  rect(90, 0, 98, par('usr')[4], col = 'red')
>  hist(x, add = TRUE)
>
> For coloured bars, use a colour vector:
>
>  hist(x, breaks = 5, col = c(3,3,4,4,2))
>
> 2. using lattice;
>
>  histogram(x,
>   panel=function(...){
>     panel.rect(90,0,98,1000,col='bisque',border=NA)
>     panel.histogram(...,col='transparent',lwd=2)
>   }
>  )
>
> Again, you can define bar colours with a colour vector.
> Lattice is more customizable albeit a little harder
> to learn.
>
> Peter Ehlers
>
>> Thanks,
>> Jason
>>
>
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>

--
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. Säugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra at uni-hamburg.de

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