将单元格颜色映射到kableExtra中的数据值以创建热图表

Question

我下面有一张桌子，想应用ROW级的热图。

（1）知道如何吗？现在，下面一行中的两个值的热图都相同。

（2）有没有办法使组列的标题不成90度角？现在，所有标题都是有角度的，但对于group列，最好不使用angle = 90。

这是rmd文件。

---
title: "Untitled"
output: pdf_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)


library(dplyr)
library(kableExtra)
#d = data.frame(group= c("A","b"),cat1=c(2,50),cat2=c(100,2))
d = data.frame(group= c("A"),cat1=c(2),cat2=c(NA))

d = d %>%
    mutate_if(is.numeric, function(x) {
  cell_spec(x, "latex", bold = F, background = spec_color(x,option="C", begin=.5, end = 0.99))
}) 

```



```{r table , echo= FALSE, comment = FALSE, message= FALSE, warning = FALSE, fig.height=3, fig.width = 8} 

kable(
      d, format ="latex",
      caption = "",
      booktabs = T, 
      longtable = T,
      escape = F ,
      align = "c"
      ) %>% kable_styling(latex_options = c(
        "striped", 
        "repeat_header"
        )
       )%>% row_spec( 0,angle = 90)


```

注意：理想情况下，最好使用kableExtra功能来完成此操作，以便它们的配色方案与其他kableExtra表完全匹配。

Answer 1

我实际上不确定如何从spec_color获得所需的颜色映射。另外，在下面的代码中，我使用colorRamp函数和调色板生成函数生成了颜色映射，可以根据需要进行调整。该代码还通过将缺失值涂成浅灰色来处理缺失值。

---
output: pdf_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
library(viridis)
library(dplyr)
library(kableExtra)

set.seed(2)
d = data_frame(group = sample(LETTERS[1:5], 10, replace=TRUE), cat1=runif(10, 0, 100), cat2=runif(10, 0, 100))
d[5,2] = NA

max.val = max(d[ , sapply(d, is.numeric)], na.rm=TRUE)

#pal.fnc = colorRamp(viridis_pal(option="C")(2))
pal.fnc = colorRamp(c("red", "yellow", "green"))

d = d %>%
    mutate_if(is.numeric, function(x) {
  cell_spec(round(x,1), "latex", bold = F, color=grey(.3),
            background = rgb(pal.fnc(x/max.val) %>% replace(., is.na(.), 200), maxColorValue=255))
}) 

```

```{r table , echo= FALSE, comment = FALSE, message= FALSE, warning = FALSE, fig.height=3, fig.width = 8} 
kable(
      d, format ="latex",
      linesep="",
      caption = "",
      booktabs = T, 
      longtable = T,
      escape = F ,
      align = "c"
      ) %>% kable_styling(latex_options = c(
        "striped", 
        "repeat_header"
        )
       )
```