我正在尝试在 ggplot 中生成热图。我希望每个组都有不同的颜色渐变,但不知道该怎么做。我当前的代码如下所示:
## dummy data -----------------------------------------------------------------------------
data <- data.frame(
group = sample(c("Direct Patient Care", "Indirect Patient Care", "Education", "Rounds", "Handoff", "Misce"), 30, replace = T),
pct = rnorm(30, mean = 50, sd = 8)
)
## generate group id
data <- data %>%
group_by(group) %>%
mutate(id = row_number())
data$grpid <- with(data, ifelse(group == "Direct Patient Care", 1, ifelse(group == "Indirect Patient Care", 2,
ifelse(group == "Education", 3,
ifelse(group == "Rounds", 4,
ifelse(group == "Handoff", 5,6 ))))))
## draw graph ------------------------------------------------------------------------------
library(ggplot2)
p <- ggplot(data, aes(x=id, y=group, fill = pct)) +
theme(panel.background = element_rect(fill = "white", colour = "grey50"), aspect.ratio = 0.4) +
theme(panel.grid.major = element_blank(),
panel.grid.minor = element_blank()
)+
# guides(fill = guide_legend("Time, %")) +
geom_tile() +
scale_x_continuous (name = " ", breaks = seq(1, 8, by = 1)) +
scale_y_discrete(name = " ") +
theme(axis.text.x = element_text(angle = 0,hjust = 1,vjust = 1), plot.title = element_text(hjust = 0.5) ) +
ggtitle("Heatmap of time spent doing activities across 194 shifts")
p + scale_fill_gradient2(low = "white", high = "red", limits = c(0, 80), breaks = c(0, 10, 20, 30, 40, 50, 60, 70), guide = guide_legend("Time, %")) ## change the color theme ##
如何更改每个组的颜色主题,例如“Rounds”为红色、“Misce”为蓝色、“Handoff”为绿色等...
非常感谢!
最佳答案
您可以通过在数据中创建自己的重新缩放值,然后稍微“破解” alpha
美学和 fill
美学来做到这一点:
library(tidyverse)
data %>%
group_by(group) %>%
mutate(rescale = scales::rescale(pct)) %>%
ggplot(., aes(x = factor(id), y = group)) +
geom_tile(aes(alpha = rescale, fill = group), color = "white") +
scale_alpha(range = c(0.1, 1))
首先我们创建一个名为 rescale
的新列,它 rescale
将 pct
从 0
到 1
然后你强制 scale_alpha(range = c(0, 1))
[注意,在这种情况下,我使用 c(0.1, 1)
这样你仍然可以“看到”零分。
最后,您可能想要删除指南:
data %>%
group_by(group) %>%
mutate(rescale = scales::rescale(pct)) %>%
ggplot(., aes(x = factor(id), y = group)) +
geom_tile(aes(alpha = rescale, fill = group), color = "white") +
scale_alpha(range = c(0.1, 1)) +
theme(legend.position = "none")
注意通过使用 aes(x = factor(id)...
您可以手动设置您的 x-axis
因为在这种情况下,您似乎想将其视为因子不是数字比例。
最后,如果你真的想要花哨,你可以将 axis.text.y
颜色双重编码为你的 factor
级别的颜色(即, data$group
) 变量:
data %>%
group_by(group) %>%
mutate(rescale = scales::rescale(pct)) %>%
ggplot(., aes(x = factor(id), y = group)) +
geom_tile(aes(alpha = rescale, fill = group), color = "white") +
scale_alpha(range = c(0.1, 1)) +
theme(legend.position = "none",
axis.text.y = element_text(color = scales::hue_pal()(length(levels(data$group)))),
axis.ticks = element_blank()) +
labs(x = "", y = "")
关于r - ggplot中的热图,每组不同的颜色,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50338361/