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I am suppressing some of my subindexes in some equations, and I am using a dot in order to signal which dimension is gone. Up to now, I have been using a \bullet symbol as a dot. Is this the "correct" what of doing it, or is there another symbol I am unaware of?

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align*}
\beta_{kn} &\sim \left(1\times 1\right) \\
\boldsymbol{\beta}_{k\bullet} &= \left(\beta_{k1},\dots,\beta_{kN}\right) \sim \left(N\times 1\right) \\
\boldsymbol{\beta}_{\bullet n} &= \left(\beta_{1n},\dots,\beta_{Kn}\right) \sim \left(1\times K\right)
\end{align*}
\end{document}

enter image description here

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  • 1
    \textperiodcentered, which might require \usepackage{textcomp}
    – MadyYuvi
    Commented Jan 13, 2023 at 13:52
  • 1
    @MadyYuvi that might end too small and easily overlooked
    – daleif
    Commented Jan 13, 2023 at 13:53
  • 3
    I'd probably use {\cdot} but no right and wrong, just whatever you prefer Commented Jan 13, 2023 at 14:20
  • Related: tex.stackexchange.com/questions/564408/…
    – Gaussler
    Commented Jan 13, 2023 at 18:35

1 Answer 1

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I like use _ instead of dot.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align*}
\beta_{kn}                & \sim \left(1\times 1\right)                                            \\
\boldsymbol{\beta}_{k\_}  & = \left(\beta_{k1},\dots,\beta_{kN}\right) \sim \left(N\times 1\right) \\
\boldsymbol{\beta}_{\_ n} & = \left(\beta_{1n},\dots,\beta_{Kn}\right) \sim \left(1\times K\right)
\end{align*}
\end{document}

enter image description here

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  • Is this the real answer for the OP's question?
    – MadyYuvi
    Commented Jan 13, 2023 at 14:44
  • @MadyYuvi I know what OP wants is a dot. It will be helpful if OP thinks the _ is better. If still like dot, then ignore my answer.
    – Clara
    Commented Jan 14, 2023 at 1:37

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