带有R Markdown的YAML中的错误 [英] Error in YAML with R Markdown

问题描述

我有以下名为test.Rmd的R Markdown脚本:

I have the following R Markdown script called test.Rmd:

---
params: 
  results: 
  value: !r mtcars
---

```{r setup, echo=FALSE, include=FALSE}
df <- params$results
knitr::kable(df)
```

当我在OpenCPU中运行以下命令时:

When I run the following in OpenCPU:

library(rmarkdown)
library(knitr)
rmarkdown::render("test.Rmd", output_format = "html_document")

yaml :: yaml.load中的错误(yaml，handlers = knit_params_handlers(evaluate = valuate)，: 未使用的参数(eval.expr = TRUE)

Error in yaml::yaml.load(yaml, handlers = knit_params_handlers(evaluate = evaluate), : unused argument (eval.expr = TRUE)

我安装了不同版本的YAML，但并没有解决问题.

I installed different versions of YAML and it didn't fix the problem.

推荐答案

我也花了一些时间来解决此问题.看来新的knitr需要yaml 2.2.0及更高版本.

I took a while to fix this as well. It seems the new knitr needs a version of yaml 2.2.0 and above.

@ScientificProgrammer在github上的帮助 https://github .com/viking/r-yaml/issues/56#issuecomment-441394840 帮助了我.解决方案是在标准R而非RStudio 中使用devtools安装新软件包.我确实收到了一些编译器错误消息，但它似乎可以正常工作.所以不要让那让你失望.

This help from @ScientificProgrammer on github here https://github.com/viking/r-yaml/issues/56#issuecomment-441394840 helped me. The solution was to install the new package using devtools from within standard R not RStudio. I did get some compiler error messages but it seemed to work. So don't let that put you off.

因此在标准R中，假设您拥有devtools包

So inside Standard R assuming you have the devtools package

library(devtools)
devtools::install_github("viking/r-yaml")

我在下面完整地复制了他们的答案，以帮助人们在链接断开的情况下:

I am copying their answer over in full below to help people in case the link breaks:

如果有帮助，我在遇到IndrajeetPatil时会遇到相同的问题 我试图从内部运行devtools :: install_github("viking/r-yaml") RStudio.如果我从内部运行install.packages("viking/r-yaml") RStudio，问题已解决.

In case it helps, I was having the same problem as IndrajeetPatil when I tried to run devtools::install_github("viking/r-yaml") from within RStudio. If I ran install.packages("viking/r-yaml") from within RStudio, the problem was resolved.

但是，当我退出RStudio并运行时 标准R中的devtools :: install_github("viking/r-yaml") 客户端，我仍然收到相同的编译器警告，但是问题 也走了.

However, when I exited RStudio and ran devtools::install_github("viking/r-yaml") from within the standard R client, I still received the same compiler warnings, but the problem also went away.

P.S.另一种对某些人有用的流行解决方案是完全删除yaml目录，例如使用Windows资源管理器.重新启动RStudio Ctrl + Shift + F10，然后重新安装yaml程序包.这对我不起作用，因为它一直只给我2.1.18版本.

P.S. Another popular solution that helped some people was to delete the yaml directory completely e.g. using Windows Explorer. Restart RStudio Ctrl + Shift + F10, and then re-install yaml package. That did not work for me as it kept giving me just 2.1.18 version.

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