Hi YiYao,
you need the `?panel.abline()' function, somehing like:
panel=function(x, breaks, equal.widths, type, ...){
panel.histogram(x, breaks, equal.widths, type, ...)
panel.abline(v=mean(singer$height))
}inside the `histogram()' function could do the trick.
I hope it helps.
Best, Dimitris
---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/16/396887 Fax: +32/16/337015 Web: http://www.med.kuleuven.ac.be/biostat/ http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm
----- Original Message ----- From: "YiYao_Jiang" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: "YiYao_Jiang" <[EMAIL PROTECTED]>
Sent: Monday, October 25, 2004 9:16 AM
Subject: [R] Multiple formula in one block
Hi Everybody:
I want to draw some chart using command "histogram" and add another curve in it.
Example:
require(stats)
data(singer)
library(lattice)
histogram( ~ height | voice.part, data = singer, nint = 17, endpoints = c(59.5, 76.5), layout = c(2,4), aspect = .5, xlab = "Height (inches)")
Now I got a chart of 8 blocks, then I need add :" abline(v=mean(singer$height), col=2, lwd=2) " or any other curve to every block.
How can I do to achieve it. Thanks.
Best Regards
YiYao Jiang
Product Division/ product Testing Department Semiconductor Manufacturing International Corporation 18 ZhangJiang Road, PuDong New Area, Shanghai ZIP: 201203 Tel:86-21-5080-2000 Ext. 15173
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