r - How to set different scales for each group/factor in tile plot -


i have code given below

d = data.frame(sites=rep(paste("s", 1:31),each=12),                value=runif(31*12),                panel=c(rep("group 1",16*12), rep("group 2", 12*12),                        rep("group 3", 3*12)))   ggplot(d, aes(x = sites, y = factor(0))) +     geom_tile(aes(fill = value)) +     scale_fill_gradient(low = "green", high = "blue") +    facet_wrap(~ panel, ncol = 1)

enter image description here

now instead of single scale, want separate gradient scales each group.

there's no way within ggplot2, gridextra rescue!

library(ggplot2) library(gridextra)  n <- length(unique(d$panel)) l <- vector(mode = "list", length = n) (i in 1:n) {   dd <- d   dd[d$panel!=unique(d$panel)[i], "value"] <- na   l[[i]] <-      ggplot(dd, aes(x = sites, y = 0)) +        geom_tile(aes(fill = value)) +        scale_fill_gradient(low = "green", high = "blue", na.value = na) }  grid.arrange(grobs = l, ncol = 1)

enter image description here

to illustrate different scales, change d$value[d$panel == "group 3"] <- rnorm(36):

enter image description here


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