How can I add a straight line form (5, 5) to infinity to this plot? I use abline but I do not want the line between 5 to 5, just I need after 5 to infinity.
x <- c(1:5); y <- x
plot(x, y, type="l")
abline(v= max(x), col="black", lwd=2, lty=2)
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thelatemail
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rose
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1How do you represent infinity in a plot? Why not just plot `[5, ymax]` – Ricardo Saporta Aug 02 '13 at 01:02
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2Really? Infinity on a plot? Please explain why this is a meaningful request. – IRTFM Aug 02 '13 at 01:08
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@Dwin - admittedly, you can use `Inf` and `-Inf` in `ggplot` - as in http://stackoverflow.com/questions/6801571/ggplot2-shade-area-above-line – thelatemail Aug 02 '13 at 01:13
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Amusing, ... but really not what was articulated. – IRTFM Aug 02 '13 at 02:08
1 Answers
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You can use segments and par('usr') to extract the existing axis limits. I've used lty=1 to show that it wil extend to the edge of the plotting area
plot(x,y,type = 'l')
segments(x0 = max(x), y0 = max(y), y1 = par('usr')[4], lwd=2)
mnel
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