Error: Missing $ inserted when using kable

Question

我正在尝试使用 r markdown、kable 和 kableExtra 输出乳胶 table。我需要使用条件逻辑为 table 和 cell_spec 添加颜色。但是对于 pdf 输出，它显示乳胶代码如下；

pdf output with latex code

如果我在 kable() 中添加 escape = false，则会出现以下错误，

! Missing $ inserted. $ l.142 sepal_ length & sepal_width & petal_length & petal_width & Species\ Here is how much of TeX's memory you used: 14185 strings out of 492970 208670 string characters out of 3125261 323511 words of memory out of 3000000 17834 multiletter control sequences out of 15000+200000 23725 words of font info for 40 fonts, out of 3000000 for 9000 1141 hyphenation exceptions out of 8191 41i,9n,38p,1027b,272s stack positions out of 5000i,500n,10000p,200000b,50000s

我是 rmarkdown 和 latex 的新手，请帮助我解决问题。谢谢你。

这是我的 rmd 文件代码：

---
title: "Iris Data Table"
output: pdf_document
header-includes: \usepackage [table]{xcolor}
geometry: margin = 1cm
params:
  n: NA
  datafile: "//ad.monash.edu/home/User076/vbed0001/Documents/IRIS.csv" #always set the absolute full path
---

```{r, echo=FALSE, message=FALSE}

d <- read.csv(params$datafile, header = TRUE, sep = ",")

# this uses to remove the warning messages from the pdf file
library(memisc, warn.conflicts = FALSE, quietly=TRUE)

# the package order is important, always kableExtra at the top
#options(kableExtra.latex.load_packages = FALSE)
library(kableExtra)
library(magrittr)
library(formattable)
library(dplyr)
library(knitr) 
library(devtools)


options(knitr.table.format = "latex")

if(params$n == "set"){
dtset <- d %>% filter(Species == "setosa")

dtset <- d %>% filter(Species == "setosa")

dtset %>%
 mutate(
   sepal_length = cell_spec(sepal_length,format = "latex",background = (ifelse(sepal_length>4.5,"#D3D3D3","#ff0000")))

 )%>%
 kable(format = "latex",caption = "Setosa Table")%>%
   kable_styling(position = "center",bootstrap_options = "bordered")


}


```

Answer 1

此错误是由于您的数据框中包含下划线“_”造成的。在这种情况下，列名称包含下划线。在 TeX 中，此符号用于在数学环境中设置下标。这就是为什么在普通文本中使用时必须对其进行转义 (\_) 的原因。删除、转义或替换下划线，例如

names(data) <- gsub("_", "", names(data))    # remove
names(data) <- gsub("_", "\_", names(data)) # escape
names(data) <- gsub("_", " ", names(data))   # replace with space

Answer 2

在我的例子中，我需要从块名称中删除下划线。

例如，这个有效：

```{r summaryTableBaseline, results='asis', echo=FALSE}
summaryTableBaseline %>%
    kable(col.names = c("Docker Image", "Min", "Mean", "Median", "Max"),
          caption = "Baseline Benchmark") %>%
    kable_styling()
```

但这不起作用：

```{r summary_Table_Baseline, results='asis', echo=FALSE}
summaryTableBaseline %>%
    kable(col.names = c("Docker Image", "Min", "Mean", "Median", "Max"),
          caption = "Baseline Benchmark") %>%
    kable_styling()
```

Error: Missing $ inserted when using kable

Error: Missing $ inserted when using kable

r

latex

r-markdown

pdflatex

kable