在有线单元中添加箭头或图形？

Question

是否可以在带有pdf_output的有线单元中添加向上或向下箭头？有没有人幸运地将任何特殊数字添加到有线单元中？

Answer 1

您可以运行以下语句：

---
title: "kable arrow"
author: "Alessio Benedetti"
date: "17/11/2019"
output: html_document
---

```{r}
library(knitr)
df <- data.frame(
  stock = c('Apple','Amazon','Microsoft','Tesla'),
  value = c(300,200,150,250),
  difference = c(50,-10,20,-15)
)
df$trend <- ifelse(df$difference >0,
                   '![](https://www.picgifs.com/glitter-gifs/a/arrows/picgifs-arrows-110130.gif)',
                   '![](https://www.picgifs.com/glitter-gifs/a/arrows/picgifs-arrows-30184.gif)'
                  )

kable(df)
```