如何直接编织到R对象? [英] How to knit directly to R object?

问题描述

我想将knit() ted文档直接作为R对象作为字符向量存储在R中.

I'd like to store a knit()ted document directly in R as an R object, as a character vector.

我知道我可以通过knit()设置为tempfile()然后导入结果来做到这一点，就像这样:

I know I can do this by knit()ing to a tempfile() and then import the result, like so:

library(knitr)
library(readr)
ex_file <- tempfile(fileext = ".tex")
knitr::knit(text = "foo", output = ex_file)
knitted_obj <- readr::read_file(ex_file)
knitted_obj

返回

# [1] "foo\n"

按预期.

是否可以使用tempfile()而不通过直接将结果配管"到向量上来完成 的操作?

Is there a way to do this without using a tempfile() and by directly "piping" the result to a vector?

为什么，我到底要这个吗?

• *.tex字符串将以编程方式保存到光盘，并在以后呈现为PDF.在下游功能中从光盘读取渲染的*.tex会使代码更复杂.
• 缓存非常容易，并且将移动到另一台计算机上.
• 我真的很害怕一般的副作用，尤其是跨机器/OS的文件系统的恶作剧.我想将这些功能隔离到尽可能少的(print()，save()，plot())函数.

• *.tex string will be programmatically saved to disc, and rendered to PDF later. Reading rendered *.tex from disc in downstream functions would make code more complicated.
• Caching is just a whole lot easier, and moving this cache to a different machine.
• I am just really scared of side effects in general and file system shenanigans across machines/OSes in particular. I want to isolate those to as few (print(), save(), plot()) functions as possible.

这会使我成为一个糟糕的(或仅仅是OCD的)R开发人员吗?

Does that make me a bad (or just OCD) R developer?

推荐答案

它应该像这样的一行一样简单:

It should be as straightforward as a single line like this:

knitted_obj = knitr::knit(text = "foo")

您可能想再次阅读帮助页面?knitr::knit，以了解返回的信息.

You may want to read the help page ?knitr::knit again to know what it returns.

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