[R] Help with plotting a line that is multicoloured based on levels of a factor

Peter Ehlers ehlers at ucalgary.ca
Tue Mar 29 03:57:28 CEST 2011

On 2011-03-28 09:33, Pam Allen wrote:
> Thank you Jim and David for your help.
> The 'levels' call is not a misdirection, in my actual dataset it is
> necessary because the flows aren't symmetrical.   So while your solution is
> quite elegant David, it doesn't apply to my actual data, just the example.
> Too bad, it's quite nice!
> I do think that "color.scale.lines" can work, now I just need to figure out
> how!  Unfortunately when I tried your example Jim:
> date=c(1:300)
> flow=sin(2*pi/53*c(1:300))
> levels=c(rep(c("high","med","low"),100))
> data=cbind.data.frame(date, flow, levels)
> plot(data$date,data$flow,type="n")
> library(plotrix)
> color.scale.lines(data$date,data$flow,
>    col=color.scale(data$flow,extremes=c("blue","red")))
> I got this error:
> "Error in length(redrange) : 'redrange' is missing"

The code works just fine for me with plotrix_3.0-7.
It would help if you provided your sessionInfo().

Peter Ehlers

> But I do think the function is the way to go for my dataset.
> Thank you!
> -Pam
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