这已更新以符合tidyverse原则并改善对ggplot2的不良使用

每个SlowLeraner的评论我很容易做到这一点： $ b

  library（tidyverse）

 ## make data 
 dat  
 ##整形数据（tidy /高形式）
 dat2 >％
 tbl_df（）％>％
 rownames_to_column （'Var1'）％>％
 collect（Var2，value，-Var1）％>％
 mutate（
 Var1 = factor（Var1，levels = 1：10），
 Var2 = factor（gsub（V，，Var2），levels = 1：10）
）

 ##绘图数据
 ggplot（dat2， aes（Var1，Var2））+ 
 geom_tile（aes（fill = value））+ 
 geom_text（aes（label = round（value，1）））+ 
 scale_fill_gradient（low =白色，高=红色）
 

p>

I've seen heatmaps with values made in various R graphics systems including lattice and base like this:

I tend to use ggplot2 a bit and would like to be able to make a heatmap with the corresponding cell values plotted. Here's the heat map and an attempt using geom_text:

library(reshape2, ggplot2)
dat <- matrix(rnorm(100, 3, 1), ncol=10)
names(dat) <- paste("X", 1:10)
dat2 <- melt(dat, id.var = "X1")
p1 <- ggplot(dat2, aes(as.factor(Var1), Var2, group=Var2)) +
    geom_tile(aes(fill = value)) +
    scale_fill_gradient(low = "white", high = "red") 
p1

#attempt
labs <- c(apply(round(dat[, -2], 1), 2, as.character))
p1 +  geom_text(aes(label=labs), size=1)

Normally I can figure out the x and y values to pass but I don't know in this case since this info isn't stored in the data set. How can I place the text on the heatmap?

This has been updated to conform to tidyverse principles and improve poor use of ggplot2

Per SlowLeraner's comment I was easily able to do this:

library(tidyverse)

## make data
dat <- matrix(rnorm(100, 3, 1), ncol=10)

## reshape data (tidy/tall form)
dat2 <- dat %>%
    tbl_df() %>%
    rownames_to_column('Var1') %>%
    gather(Var2, value, -Var1) %>%
    mutate(
        Var1 = factor(Var1, levels=1:10),
        Var2 = factor(gsub("V", "", Var2), levels=1:10)
    )

## plot data
ggplot(dat2, aes(Var1, Var2)) +
    geom_tile(aes(fill = value)) + 
    geom_text(aes(label = round(value, 1))) +
    scale_fill_gradient(low = "white", high = "red")