The intercept, a, is the value when x = 0. Thus if you want y = 6
when x = 1991 then the line is y = 6 - (x-1991) = 1997 - x so a = 1997:
abline(a=1997, b=-1, col="dark grey", lty="dashed")
On Sun, Aug 30, 2009 at 12:25 PM, Gábor Pozsgai wrote:
> Hi,
>
> Does anybody have a hint why this does
Very simple, look at the x-axis you are plotting with. If you want
the line, then use:
abline(a=1996, b=-1, col="dark grey", lty="dashed")
On Sun, Aug 30, 2009 at 12:25 PM, Gábor Pozsgai wrote:
> Hi,
>
> Does anybody have a hint why this does not work?
>
> plot(c(1991,2000), c(-1,10))abline(a=
Hi,
Does anybody have a hint why this does not work?
plot(c(1991,2000), c(-1,10))abline(a=6, b=-1, col="dark grey", lty="dashed")
It does not generate an error message, but the line does not turn up.
If b=0 it works fine. If I change the axes of the plot to
plot(c(1,10), c(-1,10)) it does work
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