使用Knitr将绘图居中到页面中间 [英] Centre a plot to the middle of a page using Knitr

问题描述

我想将绘图与编织器生成的pdf文档的页面中心对齐.我可以使用fig.align='center'将绘图水平对齐到中心，但无法弄清楚如何使绘图垂直对齐中心.

I'd like to align a plot to the center of a page of a knitr-generated pdf document. I can horizontally align the plot to the center using fig.align='center' but can't figure out how to get the plot vertically aligned to the center.

我一直在使用以下代码:

I've been using the following code:

---
header-includes: \usepackage{graphicx}
output: 
  pdf_document
geometry:
  left=1in,right=1in,top=1in,bottom=1in
---


```{r,fig.align='center',out.extra='angle=90', echo=FALSE}

library(ggplot2)
ggplot(diamonds, aes(y=carat, x=price, colour=clarity))+geom_point()+
facet_wrap(~cut)

```

推荐答案

在LaTeX一侧，垂直居中的图形必须是 figure，位置为p .使用knitr如何实现此目标取决于:

On the LaTeX side, a vertically centered figure must be a figure with position p. How this can be achieved using knitr depends:

• 如果图形有标题，则将其放置在figure环境中(请参阅 fig.env ).然后，仅需要附加选项fig.pos = 'p'.

• 如果图形没有标题(通常很糟糕)，则可以手动添加figure环境:

• If the figure has a caption, it is placed in a figure environment (see fig.env). Then only the additional option fig.pos = 'p' is needed.

• If the figure has no caption (which is usually bad), you can manually add the figure environment:

\begin{figure}[p]

```{r,fig.align='center',out.extra='angle=90', echo=FALSE}

library(ggplot2)
ggplot(diamonds, aes(y=carat, x=price, colour=clarity))+geom_point()+
facet_wrap(~cut)

```
\end{figure}

请注意，这在编译为PDF时有效，但将您限制为PDF作为输出格式.

Note that this works when compiling to PDF but restricts you to PDF as output format.

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