使用read_chunk('foo.R')进行Lyx + knitr代码外部化失败 [英] Lyx+knitr code externalization with read_chunk('foo.R') fails

问题描述

我正尝试使用read_chunk()从我的Lyx文件中分离我的R代码，如此处.

I am trying to use read_chunk() to separate my R code from my Lyx file as explained here.

我的Lyx设置从 knitr_minimal.lyx 编译了knitr_minimal.pdf没有任何问题.

My Lyx setup compiled the knitr_minimal.pdf from knitr_minimal.lyx without any issues.

但是后来我试图替换它:

But then I tried to replace this:

<<boring-random>>=
set.seed(1121)
(x=rnorm(20))
mx <- mean(x)
vx <- var(x)
@

x的第一个元素是\ Sexpr {x [1]}.它的平均值是\ Sexpr {mx}.

The first element of x is \Sexpr{x[1]}. Its mean is \Sexpr{mx}.

与此:

<<boring-random, cache=FALSE>>=
read_chunk('minimal.R')
@

x的第一个元素是\ Sexpr {x [1]}.它的平均值是\ Sexpr {mx}.

The first element of x is \Sexpr{x[1]}. Its mean is \Sexpr{mx}.

脚本minimal.R保存在同一目录中，并且仅由

The script minimal.R is saved in the same directory, and consists of just

set.seed(1121)
(x=rnorm(20))
mx <- mean(x)
vx <- var(x)

我将修改后的文件另存为knitr_minimal1.lyx并进行了编译.文件knitr_minimal1.pdf可以编译，但是可以代替

I saved the modified file as knitr_minimal1.lyx and compiled it. The file knitr_minimal1.pdf compiled alright, but instead of

x的第一个元素是0.145.平均值是0.3217.

The first element of x is 0.145. Its mean is 0.3217.

我知道

x的第一个元素是eval中的错误(expr，envir，enclos):找不到对象"x".其平均值是eval(expr，envir，enclos)中的错误:找不到对象"mx".

The first element of x is Error in eval(expr, envir, enclos) : object ’x’ not found. Its mean is Error in eval(expr, envir, enclos) : object ’mx’ not found.

如果有任何建议，我将不胜感激.

I'd be grateful for any advice.

推荐答案

您必须在minimal.R中的代码中添加与LyX文档中的块标签相对应的标签，否则knitr不知道在哪里插入代码.

You have to add a label to your code in minimal.R corresponding to the chunk label in your LyX document, otherwise knitr does not know where to insert the code.

## @knitr boring-random
set.seed(1121)
(x=rnorm(20))
mx <- mean(x)
vx <- var(x)

如果您在knitr 网页中打开R脚本，则会看到## @knitr label形式的多行注释.我将更新网页以澄清这一点. ?knitr::read_chunk中记录了另一种指定标签的方法.

If you open the R script in the knitr web page, you will see several lines of comments of the form ## @knitr label. I will update the web page to clarify this. There is an alternative approach to specify the labels, which is documented in ?knitr::read_chunk.

LyX文档的第二个问题是将read_chunk()放在boring-random块中，但是您确实需要先阅读代码 ，然后再将其插入到块中.

The second problem of your LyX document is you put read_chunk() in the boring-random chunk, but you really need to read the code before you insert it into a chunk.

<<setup>>=
read_chunk('minimal.R')
@
<<boring-random>>=
@

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