[Tex/LaTex] \noalign without line break / additional spacing

alignline-breaking

I need a non-breaking version/redefinition of \noalign to use it at the end of an environment (in this case align). So far I searched for the standard definition of \noalign to write a redefinition based on it, but I didn't find anything so far.

It would be great, if somebody could provide a definition for \noalign without creating a newline automatically (instead done by \noalign{}\\).

More clearly: If you define a \noalign-row within an align-environment and close the environment immediately after it without any lines filled with content (math), some space/skip will result in the document. I don't want this space at all and would be glad for a workaround. 😉

Minimal:

\documentclass{article}
\usepackage{amsmath}

\begin{document}
\section{minimal}
lipsum
\begin{align*}
\eta_D &= \eta_0 \cdot \eta_R \cdot \eta_H
\end{align*}
normal spacing above
new round
\begin{align*}
\noalign{\centering $\eta_D = \eta_0 \cdot \eta_R \cdot \eta_H$}
\end{align*}
extended spacing below the align-env.
\end{document}

Best Answer

\noalign is not a companion for the align environment.

It is a TeX primitive that has some affects but none of them planned in this case. As @egreg already suggested in this case why not simply put the text after the alignment?

If you really want to do this then you can do

\noalign{\hbox{some content}\kern-\baselineskip}

But I wouldn't recommend it.

Related Solutions

[Tex/LaTex] Title in subfloat without line-break

You can make the figure a little wider by using some spaces to its left and right (I removed some spurious blank spaces from your code):

\documentclass{article}
\usepackage{subfig}
\usepackage{graphicx}

\begin{document}

\begin{figure}[!ht]
\centering
\subfloat[Subgraph]{%
  \label{fig:subg}
  \includegraphics[width=0.2\textwidth]{example-image-a}
}\qquad
\subfloat[Induced subgraph]{%
  \hspace*{4pt}%
  \includegraphics[width=0.2\textwidth]{example-image-b}
  \hspace*{4pt}%
}
\caption{Subgraph and induced subgraph.}
\label{fig:ind}
\end{figure}

\end{document}

enter image description here

Another option is to use the width option for \captionsetup:

\documentclass{article}
\usepackage{subfig}
\usepackage{graphicx}

\begin{document}

\begin{figure}[!ht]
\centering
\captionsetup[subfigure]{width=80pt}%
\subfloat[Subgraph]{%
  \label{fig:subg}
  \includegraphics[width=0.2\textwidth]{example-image-a}
}\qquad
\captionsetup[subfigure]{width=80pt}%
\subfloat[Induced subgraph]{%
  \includegraphics[width=0.2\textwidth]{example-image-b}
}
\caption{Subgraph and induced subgraph.}
\label{fig:ind}
\end{figure}

\end{document}

enter image description here

[Tex/LaTex] How to break lines in tables without vertical spacing

Don't reinvent the wheel: the makecell package is done for that, and a common formatting of such cells, with its \thead and \makecell (and some others).

Another solution, to have the multiline cells in the second column centred (while the lines in each cell are left-aligned) is to use the \eqparbox command from the homonymous package. It uses a system of tags that ensures all \parboxes with the same tag have the width of the widest content. Note it may require two compilations to measure the widest box.

In addition, I suggest to use the rule commands from booktabs, which will set some vertical padding above and below horizontal rules:

\documentclass{article}

\usepackage[english]{babel}

\usepackage{makecell, booktabs}
\renewcommand\theadfont{\bfseries}
\renewcommand\theadalign{lc}
\renewcommand\cellalign{tl}

\usepackage{eqparbox}

\begin{document}

\begin{tabular}{ccp{8cm}}
  \toprule
  \thead{Command} & \thead{Declaration} & \thead{Output}\\
  \midrule
  \verb|\textrm| & \makecell{First one\\foobar\\again} & small test example\\
  \midrule
  \verb|\textrm| & \makecell[tl]{First one\\foobar\\again} & small test example\\
  \midrule
  \verb|\textrm| & \makecell[tl]{First one\\foobar\\again} & small test example\\
  \bottomrule
\end{tabular}
\vskip 1cm

\begin{tabular}{ccp{8cm}}
  \toprule
  \thead{Command} & \thead{Declaration} & \thead{Output}\\
  \midrule
  \verb|\textrm| & \eqparbox{Col}{First one\\foobar\\again} & small test example\\
  \midrule
  \verb|\textrm| & \eqparbox{Col}{First}% 
  & small test example\\
  \midrule
  \verb|\textrm| & \eqparbox{Col}{First one\\foobar\\again} & small test example\\
  \bottomrule
\end{tabular}

\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Title in subfloat without line-break

[Tex/LaTex] How to break lines in tables without vertical spacing

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