在rmarkdown中对齐方框内的方程

Question

我想在rmarkdown的框中获得对齐方程。我正在编织pdf。

框是必要的原因是因为我使用的YAML元数据自动左对齐所有的文本，但我想方程居中。

这是我的rmarkdown代码。正如您在运行时可以看到的那样，方程式居中，但第二组=符号未在两条线上对齐。

任何帮助非常感谢。

--- 
title: "Aligning equations in a box" 
output: 
    pdf_document: default 
    html_document: null 
    word_document: null 
toc: yes 
linestretch: 1.3 
classoption: fleqn 
header-includes: 
- \setlength{\mathindent}{0pt} 
- \setlength\parindent{0pt} 
--- 


\setlength{\abovedisplayskip}{-15pt} 
\setlength{\belowdisplayskip}{1pt} 
\setlength{\abovedisplayshortskip}{1pt} 
\setlength{\belowdisplayshortskip}{1pt} 

```{r global_options, include=FALSE, echo = FALSE} 

knitr::opts_chunk$set(fig.width=12, fig.height=8, fig.path='Figs/', 
         echo=FALSE, warning=FALSE, message=FALSE, dev = 'pdf') 
``` 

These words are automatically left-aligned by the YAML meta-data above so a box is necessary to centre equations. 

### Equation 11.6 

\[\large 
    \makebox[\linewidth]{$\displaystyle 
    \begin{aligned} 
       \text{when}\ PT &= 0:logit\ h(t_{j})\ &= [\alpha_{7}D_{7} + \alpha_{8}D_{8} + \cdots + \alpha_{12}D_{12}]\\ 
       \text{when}\ PT &= 1:logit\ h(t_{j})\ &= [\alpha_{7}D_{7} + \alpha_{8}D_{8} + \cdots + \alpha_{12}D_{12}] + \beta_{1} 
    \end{aligned} 
    $} 
\] 

Answer 1

不知道我明白了，但是有必要有一个大的空间吗？如果没有，你可以只取出&，

\[\large 
     \makebox[\linewidth]{$\displaystyle 
     \begin{aligned} 
        \text{when}\ PT =& 0:logit\ h(t_{j})\ = [\alpha_{7}D_{7} + \alpha_{8}D_{8} + \cdots + \alpha_{12}D_{12}]\\ 
        \text{when}\ PT =& 1:logit\ h(t_{j})\ = [\alpha_{7}D_{7} + \alpha_{8}D_{8} + \cdots + \alpha_{12}D_{12}] + \beta_{1} 
     \end{aligned} 
     $} 
    \] 

这给

如果你想有一个空间，你可以使用类似\qquad或\quad

\[\large 
     \makebox[\linewidth]{$\displaystyle 
     \begin{aligned} 
        \text{when}\ PT =& 0:logit\ h(t_{j})\ \qquad= [\alpha_{7}D_{7} + \alpha_{8}D_{8} + \cdots + \alpha_{12}D_{12}]\\ 
        \text{when}\ PT =& 1:logit\ h(t_{j})\ \qquad= [\alpha_{7}D_{7} + \alpha_{8}D_{8} + \cdots + \alpha_{12}D_{12}] + \beta_{1} 
     \end{aligned} 
     $} 
    \] 

这给我

编辑：

回答您的评论的问题。将这些块包裹在两个&之间。

\[\large 
     \makebox[\linewidth]{$\displaystyle 
     \begin{aligned} 
        \text{whenmoretext}\ PT &= 0:logit\ h(t_{j})\ & &= [\alpha_{7}D_{7} + \alpha_{8}D_{8} + \cdots + \alpha_{12}D_{12}]\\ 
        \text{when}\ PT &= 1:logit\ h(t_{j})\ & &= [\alpha_{7}D_{7} + \alpha_{8}D_{8} + \cdots + \alpha_{12}D_{12}] + \beta_{1} 
     \end{aligned} 
     $} 
    \]