尊重Knitr中的全局选项

问题描述

在我的R Markdown文档中设置全局选项时遇到麻烦.下面是一个简单的示例.在这种情况下，我尝试设置global.par = TRUE.期望将我在一个卡盘中所做的任何par()规格都携带到后续块中.但是，这没有发生.

I am having trouble with setting global options in my R Markdown documents. A simple example follows. In this case I've attempted to set global.par = TRUE. The expectation is that any par() specifications I make in one chuck are carried into subsequent chunks. However, this is not happening.

```{r package_options, include=FALSE}
knitr::opts_knit$set(global.par = TRUE)
```

```{r}
lambda <- 0.2; n <- 1000
exp <- rexp(n, lambda)
par(cex = 0.7)
hist(exp)
```

```{r}
lambda <- 0.02; n <- 1000
exp <- rexp(n, lambda)
hist(exp)
```

规格:Max OS 10.11，R版本3.2.0(2015-04-16)，RStudio 0.98.1062，knitr 1.12.3

Specs: Max OS 10.11, R version 3.2.0 (2015-04-16), RStudio 0.98.1062, knitr 1.12.3

推荐答案

此问题已已修复在 knitr (> = v1.12.17)中，您可以测试当前的 Github上 knitr 的开发版本.我只是发现设置mfcol/mfrow会将cex重置为1，这是 knitr 无法正确恢复cex的根本原因.

This issue has been fixed in knitr (>= v1.12.17), and you may test the current development version of knitr on Github. I just discovered that setting mfcol/mfrow will reset cex to 1, and that was the root cause of knitr not being able to restore cex correctly.

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