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？原因是一些已经停产的软件包可能只适用于旧版本的R

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)

---

我在这里添加了输出,因为注释框Rscript太大了,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

```

在运行KNIT HTML时出现以下错误

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

Answer 1

使用engine标签:

```{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knitr预览图片: