问同时使用facet_wrap和geom_tile时改变填充比例

EN

library(tidyverse)

pp <- function (n,r=4) {
  x <- seq(-r*pi, r*pi, len=n)
  df <- expand.grid(x=x, y=x)
  df$r <- sqrt(df$x^2 + df$y^2)
  df$z <- cos(df$r^2)*exp(-df$r/6)
  df
}
tmp <- pp(20)
tmp$type <- rep(1:4,each=nrow(tmp)/4)
tmp$z <- tmp$z*(10^(tmp$type))

plot_func <- function(df, name) {
  ggplot(data = df, aes(x = x, y = y, fill = z)) +
    geom_tile() +
    scale_fill_continuous(name = name)
}

nested_tmp <- tmp %>% 
  group_by(type) %>% 
  nest() %>% 
  mutate(plots = map2(data, type, plot_func)) 

gridExtra::grid.arrange(grobs = nested_tmp$plots)

> nested_tmp
# A tibble: 4 × 3
     type               data    plots
    <int>             <list>   <list>
  1     1 <tibble [100 × 4]> <S3: gg>
  2     2 <tibble [100 × 4]> <S3: gg>
  3     3 <tibble [100 × 4]> <S3: gg>
  4     4 <tibble [100 × 4]> <S3: gg>    

library(dplyr)
tmp1 <- group_by(tmp,type) # grouping the data by type
tmp2 <- mutate(tmp1, z1 = (z-mean(z))/sd(z)) #groupwise standardization 
ggplot(tmp2,aes(x,y))+geom_tile(aes(fill=z1))+facet_wrap(~type,scales="free")