Hi, thanks again for your help. I played around with your suggestions to change the appearance of my graph, but there is still a problem I could not fix. The vector, which I want to plot, contains 60 entries. After 3 bars I want to have a large gap between the next 3 bars. But what always happens is, that R took at the beginning just 2 bars and then always 3 bars ending up with one bar at the end. So I have created a new vector v <- c(0,0,vectorToPrint) plotting this vector with the following command: barplot(v, space=rep(c(0,0,2)) ). It works but getting always some warning messages. Instead of 0,0 I tried as well NA, NA but same result. So is there a way to achieve that without warning messages?
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