Dear all,

I have a simple question for which I cannot find the answer.

I need to make an easy plot, but for the x axis I need to be able to specify
by myself the division of x axis from x[,1] either every single observation,
or every 5th, or 10th or 20th

x <- matrix(data=NA, nrow=100, ncol=2)
x[,1]<-seq(1,100,1)
x[,2]<-rnorm(100)

Thanks a lot for your help!!!

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