Use placeins for subsections

Question

I would like to place figures in my document in certain subsections. Normally I would achieve this with float using [H]. But this would mean, that the figures are at fixed points in my text and sometimes this just doesn't look good.

I already found this question: How do I ensure that figures appear in the section they're associated with?

How can I tell LaTeX use subsections as float barriers instead of sections.

My eyes keep wanting to pronounce placeins like proteins. :) — Kaz, Jun 11 '13 at 20:29

score 44 · Answer 1 · answered Jun 11 '13 at 12:28

44

If \subsection implicitely calls \FloatBarrier, then also \section should do it:

\usepackage[section]{placeins}

The following adds the implicit \FloatBarrier to \subsection:

\makeatletter
\AtBeginDocument{%
  \expandafter\renewcommand\expandafter\subsection\expandafter{%
    \expandafter\@fb@secFB\subsection
  }%
}
\makeatother

answered Jun 11 '13 at 12:28

Heiko Oberdiek

271,626

Don't you mean "If \section implicitely calls \FloatBarrier, then also \subsection should do it"? – StrawberryFieldsForever Nov 04 '17 at 21:01
2

@StrawberryFieldsForever No. – Heiko Oberdiek Nov 04 '17 at 21:17
I'm wondering whether or not we actually need all these expandafter commands... – Luc Evertzen Apr 24 '20 at 12:13
1

@LucEvertzen You will get an infinite recursion without \expandafter, when \subsection is called. – Heiko Oberdiek Apr 30 '20 at 20:44

egreg · Accepted Answer · 2013-06-11T13:04:47.750

24

The placeins package, with the section option, redefines \section. You might succeed with \usepackage{placeins} and

\makeatletter
\AtBeginDocument{%
  \expandafter\renewcommand\expandafter\subsection\expandafter
    {\expandafter\@fb@secFB\subsection}%
  \newcommand\@fb@secFB{\FloatBarrier
    \gdef\@fb@afterHHook{\@fb@topbarrier \gdef\@fb@afterHHook{}}}%
  \g@addto@macro\@afterheading{\@fb@afterHHook}%
  \gdef\@fb@afterHHook{}%
}
\makeatother

This will do the same the section option does, but for \subsection instead of \section.

Untested. On a side note, don't use [H]: it's a sure cause for problems in placing floats.

edited Jun 11 '13 at 13:04

answered Jun 11 '13 at 12:27

egreg

1,121,712

This solves my problem with the positioning, but it changes all my section/subsection numbering. – Jun 11 '13 at 13:00
@DaniWho Sorry, I missed doing a change. Fixed. The \section command should have been \subsection. – egreg Jun 11 '13 at 13:04
Note that this solution eliminates the \FloatBarrier in \section! It can happen that a float ends between a section title and its first subsection. To avoid this, you need to redefine both. – Luis Jul 29 '16 at 17:43
this can clearly be used also for subsubsection – Alessandro Cuttin Oct 10 '18 at 15:29
It produces this error: Command @fb@secFB already defined. \begin{document} – skan Aug 18 '20 at 18:36
1

@skan That happens if you call \usepackage[section]{placeins}. The answer tells you to call \usepackage{placeins}. – egreg Aug 18 '20 at 20:16
And what's the difference between you answer and Oberdiek's? – skan Aug 19 '20 at 14:46
@skan I wrote it first – egreg Aug 19 '20 at 15:18

Use placeins for subsections

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