I use the following custom function for such a result :
midpoint <- function(x, dx) {
y <- (round((x-dx/2)/dx))*dx+dx/2
y
}
It gives the corresponding midpoints of your data, based on equally spaced
classes (width = dx) starting at the origin of the x axis.
Hope this helped,
Y. Brostaux
At 04:01 19/11/02, you wrote:
Date: Mon, 18 Nov 2002 14:21:31 +0100 (CET) From: Fred Jean <Frederic.Jean at univ-brest.fr> Subject: [R] vector of center of Hello I have a vector gd of 279 values of diameter of limpets. Using 'hist(gd, breaks=seq(10,60,5),plot=F)' I can obtain a vector of 10 centers of size-class ($mids). But I'd like to work on a vector of 279 values being the mids (centers of size-classes) corresponding to the respective 279 values in gd. I looked in the different manuals and in archives of list but didn't find how to obtain such a vector... I looked around in the manual of functions such as levels, density, ... but didn't find a simple solution, which may exists I believe. thanks so much for taking time to answer this (naive/newbie) question. Fred
Ir. Yves Brostaux - Statistics and Computer Science Dpt. Gembloux Agricultural University 8, avenue de la Facult? B-5030 Gembloux (Belgium) T?l : +32 (0)81 62 24 69 E-mail : brostaux.y at fsagx.ac.be Web : http://www.fsagx.ac.be/si/ -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._