[R] Errorbars

Hi, Does anyone know how i get rid of the marker point in my error bars? The bars default function (it seems) is to have a dot in the middle of the bar, however i don't want it there. I am using Hmis to draw my errorbars and code is a<-as.vector(tapply(Sporangia,list(Host,Isolate),mean)) b<-as.v

[R] Error bars

Hi, Can anyone help with plotting vertical error bars on a bar graph. I have tried following examples online and in the big R book and writing my own function but I have been unsuccessful and don’t really have an understanding of what it is I am doing. I have calculated my standard errors s