[Tex/LaTex] Change figure numbering

floatsnumberingsubfloats

I have a 6 subfigures in an figure environment and they are currently numbered a),b),c) etc. I would like to number them ai), bi), aii), bii) etc. Basically I'm looking for more control on the numbering, I've found stuff on how to change style of numbering but not to completely customise it. Can anyone help? Thanks Jack

Best Answer

Technically you can adjust sub-caption numbering in whichever way you like. If the structure is too fine-tuned to be described in an automated way, adjust them manually:

enter image description here

\documentclass{article}

\usepackage{graphicx,subcaption}

\begin{document}

\begin{figure}
  \centering
  \renewcommand{\thesubfigure}{ai}
  \subcaptionbox{1}{\includegraphics[width=.15\linewidth]{example-image-a}}
  \renewcommand{\thesubfigure}{bi}
  \subcaptionbox{2}{\includegraphics[width=.15\linewidth]{example-image-b}}
  \renewcommand{\thesubfigure}{aii}
  \subcaptionbox{3}{\includegraphics[width=.15\linewidth]{example-image-a}}
  \renewcommand{\thesubfigure}{bii}
  \subcaptionbox{4}{\includegraphics[width=.15\linewidth]{example-image-b}}
  \renewcommand{\thesubfigure}{aiii}
  \subcaptionbox{5}{\includegraphics[width=.15\linewidth]{example-image-a}}
  \renewcommand{\thesubfigure}{biii}
  \subcaptionbox{6}{\includegraphics[width=.15\linewidth]{example-image-b}}
  \caption{A caption}
\end{figure}

\end{document}

The format of the sub-captions can be adjusted independent from the numeration.

Another option would be to forego the help provided by subcaption and create your own layout using a tabular (say) inside the figure environment:

\documentclass{article}

\usepackage{graphicx}

\newcommand{\subcaptionstyle}{\small}
\begin{document}

\begin{figure}
  \centering
  \begin{tabular}{ *{6}{c} }
    \includegraphics[width=.15\linewidth]{example-image-a} &
    \includegraphics[width=.15\linewidth]{example-image-b} &
    \includegraphics[width=.15\linewidth]{example-image-a} &
    \includegraphics[width=.15\linewidth]{example-image-b} &
    \includegraphics[width=.15\linewidth]{example-image-a} &
    \includegraphics[width=.15\linewidth]{example-image-b} \\
    \subcaptionstyle (ai) 1 &
    \subcaptionstyle (bi) 2 &
    \subcaptionstyle (aii) 3 &
    \subcaptionstyle (bii) 4 &
    \subcaptionstyle (aiii) 5 &
    \subcaptionstyle (biii) 6
  \end{tabular}
  \caption{A caption}
\end{figure}

\end{document}

The former approach allows for cross-referencing like any other document element (like figure, or table). The latter doesn't, of course.

Related Question