[R] two colors in one variable in legend

[Jim Lemon]

Hi Ani,
Have a look at legendg in the plotrix package.

Jim

On Thu, Jul 21, 2022 at 10:21 AM ani jaya <gaaauul using gmail.com> wrote:
>
> Dear R-Help,
>
> I need to plot two colors in legend in one variable. It is basically
> same as this:
>
> https://stackoverflow.com/questions/31004236/r-legend-boxes-with-more-than-one-colour
>
> but I am not confident enough to change the legend script. What I want
> to achieve is the color in legend is side by side or half by half, for
> example, for oni blue and red and pink and lightblue for dmi.
> Here is my script and data.
>
> >dput(head(oni,30))
> c(V11 = 0.55, V12 = 0.33, V13 = 0.09, V14 = 0.2, V15 = 0.13,
> V16 = 0.37, V17 = 0.02, V18 = -0.23, V19 = -0.12, V110 = -0.11,
> V111 = 0.1, V112 = 0.36, V21 = -0.45, V22 = -0.45, V23 = -0.02,
> V24 = -0.17, V25 = -0.11, V26 = -0.15, V27 = -0.43, V28 = -0.18,
> V29 = -0.07, V210 = -0.03, V211 = -0.27, V212 = 0.07, V31 = -0.04,
> V32 = -0.13, V33 = -0.02, V34 = 0.24, V35 = 0.65, V36 = 0.92)
>
>
> >dput(head(dmi,30))
> c(V11 = -0.093, V12 = -0.12, V13 = -0.317, V14 = -0.02, V15 = 0.014,
> V16 = -0.268, V17 = -0.564, V18 = -0.71, V19 = -0.639, V110 = -0.498,
> V111 = -0.294, V112 = -0.413, V21 = -0.136, V22 = 0.056, V23 = 0.127,
> V24 = 0.168, V25 = 0.062, V26 = -0.126, V27 = -0.463, V28 = -0.516,
> V29 = -0.651, V210 = -0.447, V211 = -0.204, V212 = 0.05, V31 = 0.209,
> V32 = 0.246, V33 = 0.154, V34 = 0.194, V35 = 0.302, V36 = 0.369
>
> #scriptplot(oni[1:30],ylim=c(-3,3),type="l", pch=3, col="white",
>      ylab=expression(bold("ONI3.4 & DMI (\u00B0C)")),
>      xlab=expression(bold("Year")),lwd=2)
> abline(h=0,lwd=2,col="black")
> polygon(c(1,1:30,30),c(0,ifelse(oni[1:30]>0,oni,0),0),col="red")
> polygon(c(1,1:30,30),c(0,ifelse(oni[1:30]<0,oni,0),0),col="blue")
> segments(c(1,1:30,30),0,c(1,1:30,30),c(0,ifelse(dmi[1:30]>0,dmi,0),0),col="pink",
> lwd=2)
> segments(c(1,1:30,30),0,c(1,1:30,30),c(0,ifelse(dmi[1:30]<0,dmi,0),0),col="lightskyblue",lwd=2)
> legend("bottomleft",legend=c("ONI3.4","DMI"), fill=c("red","lightpink"),
>        density=c(NA,NA))
>
> Any help is very welcome.
> Thank you.
>
> best,
> Ani
>
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