
Among the many solutions, here is the one using phenology package:

library("phenology")

plot_errbar(1:100, rnorm(100, 1, 2),
		xlab="axe x", ylab="axe y", bty="n", xlim=c(1,100),
		errbar.x=2, errbar.y=rnorm(100, 1, 0.1))


or

x <- 1:100
plot_errbar(x=1:100, rnorm(100, 1, 2),
                	xlab="axe x", ylab="axe y", bty="n", xlim=c(1,100),
             		x.minus=x-2, x.plus=x+2)



Sincerely

Marc Girondot


Le 12/08/13 15:41, Hedera a écrit :
> Hello,
>
> I really need help, I am completely new in using R and many things were
> possible to figure out but not my last problem.
> I created a  dotchart with the dotchart2 command. On the y axis are my 16
> groups and plotted is the mean of the data from each group. And now I want
> to add the SD for every mean data point. Sure, I can calculate the SD (with
> removing the NAs that are present in my data by na.rm=TRUE) but I don´t know
> how to combine the graph with the SD. I found the arrows function but it
> looks weird when I try to plot:
> arrows(x0=m,y0=c(1:16),y1=c(1:16)-1,x1=m+1 length=0)   -> "m" is the
> calculated mean of my data with removed NAs and 167 because of the 16
> treatments
> Has somebody please, please any (easy) suggestion how to do it?
>
> I hope to get some help.
> Thank you very much for reading this.
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/help-with-adding-SD-to-graph-tp4673558.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.


-- 
__________________________________________________________
Marc Girondot, Pr

Laboratoire Ecologie, Systématique et Evolution
Equipe de Conservation des Populations et des Communautés
CNRS, AgroParisTech et Université Paris-Sud 11 , UMR 8079
Bâtiment 362
91405 Orsay Cedex, France

Tel:  33 1 (0)1.69.15.72.30   Fax: 33 1 (0)1.69.15.73.53
e-mail: marc.girondot@u-psud.fr
Web: http://www.ese.u-psud.fr/epc/conservation/Marc.html
Skype: girondot


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