是否还有其他人对浮动屏障有问题？

Question

如果我使用\FloatBarrier来维持文档的期望顺序，我会得到以下错误，并且无法编织PDF (特别是在PDF中发生)。大概六个月前起作用了。

! Undefined control sequence.
l.128 \FloatBarrier
                    \#\# Of Officer Initiated Stops, how does the race of the 

Error: LaTeX failed to compile more_effective_policing.tex. See https://yihui.org/tinytex/r/#debugging for debugging tips. See more_effective_policing.log for more info.

一个可重复的例子：*注意:我只是打开一个默认的Rmarkdown，然后在其中添加\FloatBarrier。然后我试着编织成PDF格式。

---
title: "knit"
author: "James Ades"
date: "6/9/2021"
output:
  pdf_document: default
  html_document: default
---

{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)


## R Markdown

This is an R Markdown document...

{r cars}
summary(cars)


## Including Plots

You can also embed plots, for example:


{r pressure, echo=FALSE}
plot(pressure)

Note that the `echo = FALSE` parameter was added to the code chunk to prevent printing of the R code that generated the plot.

\FloatBarrier

Answer 1

如果要使用其宏之一，则必须加载placeins包：

---
title: "knit"
author: "James Ades"
date: "6/9/2021"
output:
  pdf_document: 
    keep_tex: true
  html_document: default
header-includes:
  \usepackage{placeins}
---

{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)


## R Markdown

This is an R Markdown document...

{r cars}
summary(cars)


## Including Plots

You can also embed plots, for example:


{r pressure, echo=FALSE}
plot(pressure)

Note that the `echo = FALSE` parameter was added to the code chunk to prevent printing of the R code that generated the plot.

\FloatBarrier