RMardkown预览和pdf输出之间的紧密性

Question

我在R studio的RMarkdown文件中有这个乳胶代码：

---
title: "matrix"
date: "November 2, 2016"
output:


pdf_document: default
---

$$
\mathbf{y} = \left[\begin{array}
{rrr}
y_{1,1} \\
y_{4,3} 

\end{array}\right]
\mathbf{X} = \left[\begin{array}
{rrr}
1 & 0 & 0 & 0 \\
1 & 0 & 0 & 0 
\end{array}\right]
$$

预览在Rstudio中显示正常： 但是，当我编写pdf时，我收到此错误消息：

! LaTeX Error: \mathbf allowed only in math mode.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.88 \$\$ \mathbf{y}

pandoc: Error producing PDF
Error: pandoc document conversion failed with error 43
Execution halted

我该如何解决？

Answer 1

如果您更改为显式数学环境，则可以正常工作：

---
title: "matrix"
date: "November 2, 2016"
output:
  pdf_document: default
---

\begin{equation}
\mathbf{y} = \left[\begin{array}
{r}
y_{1,1} \\
y_{4,3} 

\end{array}\right]
\mathbf{X} = \left[\begin{array}
{rrrr}
1 & 0 & 0 & 0 \\
1 & 0 & 0 & 0 
\end{array}\right]
\end{equation}

除了您还要修复数组对齐，否则

Extra alignment tab has been changed to \cr.

（第一个需要{r}，第二个需要{rrrr}