Looks like nobody answered so far?
If I understood it correctly, you want something like:
x <- 1:36
plot(x, log(x, 1.1), xlab="Number of months", ylab="Visits(1000)",
main="webpage visits")
helper.lines <- function(x, y, lty=2, col="red", text=TRUE){
segments(par("usr")[1], y, x, y, col=col, lty=lty)
mtext(paste("(", round(x), ", ", round(y), ")", sep=""), side=2,
at=y, las=2, outer=FALSE, col=col)
}
helper.lines(x=c(12, 24, 36), y=log(c(12, 24, 36), 1.1), lty=2,
col="red", text=TRUE)
Best,
Uwe Ligges
Andreas Christoffersen wrote:
This is a very basic question. I am just wondering if there is a function
where i can choose a vector of points, and them helper lines are drawn.
I am asking because lines seams to be a cumbersome way to do this.
E.g.
x <- 1:36
plot(log(x,1.1),xlab="Number of months", ylab="Visits(1000)",main="webpage
visits")
abline(h=log(12,1.1),col="red",lty=2)
mtext(round(log(12,1.1)),side=2,at=log(12,1.1),las=2,outer=F, col="red")
abline(h=log(24,1.1),col="red",lty=2)
mtext(round(log(24,1.1)),side=2,at=log(24,1.1),las=2,outer=F, col="red")
abline(h=log(36,1.1),col="red",lty=2)
mtext(round(log(36,1.1)),side=2,at=log(36,1.1),las=2,outer=F, col="red")
In this example ablines are easy - but not good because the extend beynd the
points.
What I would like is something like
helper.lines(x=c(12,24,36), lty=2, col="red",text=T)
If "text=True" the lines are annotated with the points corresponding x and y
value.
Is there something that doed this?
Hope my explanation makes sense.
Sincerely.
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