[R] Gradient plots in ggplot2

[Jeff Newmiller]

Perhaps scale_fill_gradientn() would be useful.

On March 8, 2021 8:05:52 PM PST, phil using philipsmith.ca wrote:
>I am having trouble with a gradient fill application in ggplot2, caused
>
>by outlier values. In my reprex, most of the values are between 2 and 
>-2, but there are two outliers, 10 and -15. The outliers stand out
>well, 
>which is good, but all the other numbers show almost no colour 
>variation. I would like to continue with bold colours for the outliers,
>
>while having a more variable gradient, perhaps but not necessarily in a
>
>different colour, for the values between 2 nd -2. Any ideas on how this
>
>can be done?
>
>
>library(ggplot2)
>a <- c(rep(1,6),rep(2,6),rep(3,6),rep(4,6))
>b <- c(0.1, 0.5,-0.3, 1.2,-0.4,-1.2,
>        0.7, 0.8,-1.2,-0.5,10.0, 0.3,
>        0.2,-0.4,-15.,-0.4,-0.9,  NA,
>        0.1, 1.3,-1.4, 0.5,-0.5, 0.1)
>c <- c(rep(c("a","b","c","d","e","f"),4))
>df <- data.frame(a,b)
>ggplot(df,aes(x=a,y=c,fill=b))+
>   geom_tile()+
>   geom_text(label=paste0(round(b,1),"%"),
>     size=10,colour="gold")+
>   scale_fill_gradient(low="red",high="blue",na.value="grey50")
>
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-- 
Sent from my phone. Please excuse my brevity.