在HTML和PDF输出中指定颜色 [英] Specifying colour in HTML and PDF output

问题描述

Nicholas Hamilton的答案指定如何使用R表达式在Markdown的PDF和HTML输出中使用彩色文本.

如果我创建一个RMarkdown文档，我不会感到高兴，警告消息是

colFmt("MY RED TEXT"，"red")中的错误:找不到对象'opts_knit'调用:... inline_exec-> hook_eval-> withVisible-> eval-> eval-> colFmt执行停止

我想念什么?

复制并粘贴以下RMarkdown:

  ---标题:测试色"作者:"mbn"输出:html_document---```{r setup，include = FALSE}knitr :: opts_chunk $ set(echo = TRUE)```## R降价这是R Markdown文件.```{r汽车}colFmt = function(x，color){outputFormat = opts_knit $ get("rmarkdown.pandoc.to")if(outputFormat =='乳胶')paste("\\ textcolor {"，color，} {"，x，}"，sep =")否则if(outputFormat =='html')paste(< font color ='"，color，'>"，x，</font>"，sep =")别的X}```##现在测试颜色`r colFmt(我的红色文字"，'红色') 

解决方案

将 opts_knit $ get 更改为 knitr :: opts_knit $ get ，您的代码应该可以正常工作.

请参见 https://stat.ethz.ch/R-manual/R-devel/library/base/html/ns-dblcolon.html

An answer by Nicholas Hamilton specifies how to use colour text in PDF and HTML output from Markdown using an R expression.

If I create an RMarkdown document, I get no joy, Warning message is

Error in colFmt("MY RED TEXT", "red") : object 'opts_knit' not found Calls: ... inline_exec -> hook_eval -> withVisible -> eval -> eval -> colFmt Execution halted

What am I missing?

Copy and paste of RMarkdown below:

---
title: "test colour"
author: "mbn"
output: html_document
---

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

## R Markdown

This is an R Markdown document. 

```{r cars}
colFmt = function(x,color){
  outputFormat = opts_knit$get("rmarkdown.pandoc.to")
  if(outputFormat == 'latex')
    paste("\\textcolor{",color,"}{",x,"}",sep="")
  else if(outputFormat == 'html')
    paste("<font color='",color,"'>",x,"</font>",sep="")
  else
    x
}
```

## Test colour now

`r colFmt("MY RED TEXT",'red')`

解决方案

Change opts_knit$get to knitr::opts_knit$get and your code should work.

See https://stat.ethz.ch/R-manual/R-devel/library/base/html/ns-dblcolon.html

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