RMarkdown代碼評估，直到命令

Question

我正在使用RMarkdown我在建立我的分析。最終的輸出將是一個html文檔。其實我有一個核心代碼，這將是最後的文件，並在結束後，我有很多代碼塊和句子目前沒有用，但可以包含在最終文件。

是否存在一條命令用於說明RMarkdown在此之前評估代碼？

不一樣eval=FALSE的塊（我也得到了純文本），但在的TeX像\end{document}。我不想僅僅評論純文本，並把eval=FALSE作爲塊選項。

我試圖谷歌和閱讀RMarkdown文件，但我什麼也沒找到。

謝謝大家！並原諒我爲我可憐的英語...

Answer 1

從knit_exit()文檔：

有時我們可能需要提前退出針織過程中，並完全忽略文檔的其餘部分。此功能提供了一種機制來終止knit()。

例子：

一切後 knit_exit()

Text. 

```{r} 
print(1) 
``` 

More text. 

```{r} 
knitr::knit_exit() 
``` 

Ignored. 

```{r} 
print("Ignored.") 
``` 

將被忽略。這適用於所有輸出格式。

上面的代碼產生：

Answer 2

我找不到一種方式來獲得這兩種文件類型。因此，如果您想創建PDF，請參閱第一個示例，並且不要使用<!-- -->。在HTML中，您可以在文檔中留下兩個註釋字符。

那這對PDF

title: "Untitled" 
author: "Mario Dejung <m.dejung@imb.de>" 
date: "28 Sep 2016" 
output: pdf_document 
header-includes: \usepackage{comment} 
--- 

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

## R Markdown 

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see <http://rmarkdown.rstudio.com>. 

When you click the **Knit** button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this: 

```{r cars} 
summary(cars) 
``` 

\begin{comment} 

## Including Plots 

You can also embed plots, for example: 

```{r pressure, echo=FALSE} 
plot(pressure) 
``` 

Note that the `echo = FALSE` parameter was added to the code chunk to prevent printing of the R code that generated the plot. 

\end{comment} 

而這對於HTML

--- 
title: "Untitled" 
author: "Mario Dejung <m.dejung@imb.de>" 
date: "28 Sep 2016" 
output: html_document 
header-includes: \usepackage{comment} 
--- 

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

## R Markdown 

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see <http://rmarkdown.rstudio.com>. 

When you click the **Knit** button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this: 

```{r cars} 
summary(cars) 
``` 

<!-- 

\begin{comment} 

## Including Plots 

You can also embed plots, for example: 

```{r pressure, echo=FALSE} 
plot(pressure) 
``` 

Note that the `echo = FALSE` parameter was added to the code chunk to prevent printing of the R code that generated the plot. 

\end{comment} 

-->