在RStudio中使用knitr markdown调用两个不同版本的R（2.15.3和3.0.2）

Question

我希望能够创建一个Knitr Markdown文档 从R studio中调用不同版本的R（2.15.3和3.0.2）。这可能吗？ 原因是一些已停产的包装可能只是 在较旧版本的R中工作

例如：

Title
========================================================

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I would like to run a package from
R version 2.15.3 (2013-03-01) -- "Security Blanket"
here:
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```{r}
summary(cars)
```

embed plots:

```{r fig.width=7, fig.height=6}
plot(cars)
```
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I would like to run a package from
R version 3.0.2 (2013-09-25) -- "Frisbee Sailing"

here:
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xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

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

 embed plots:

 ```{r fig.width=7, fig.height=6}
 plot(cars)

---

我在这里添加的输出对于评论框来说太大了 Rscript，exe在： C：\ Program Files \ R \ R-2.15.3 \ bin

```{r，engine ='Rscript'，engine.path ='C / Program Files / R / R-2.15.3 / bin / Rscript'} 版本

```

运行KNIT HTML时出现以下错误

系统错误（cmd，intern = TRUE）：   '“未找到C / Program Files / R / R-2.15.3 / bin / Rscript”

Answer 1

使用engine代码：

```{r,engine='Rscript', engine.path='PATH_TO/R/R-3.0.2/bin/Rscript'}
version
```

```{r,engine='Rscript', engine.path='PATH_TO/R/R-2.15.3/bin/Rscript'}
version
```

编辑添加针织预览的图片：