Aligning a row matrix near a column matrix

Question

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation} A =  \begin{matrix}\begin{pmatrix}
  A_{00} \\
  A_{01} \\
  A_{10} \\
  A_{11}
\end{pmatrix}\end{matrix} \begin{pmatrix}
  A^*_{00} & A^*_{01} & A^*_{10} & A^*_{11}
\end{pmatrix}
\end{equation}
 \end{document}

I want to align the row matrix near the first row of the column vector. How can I do that?

Answer 1

I would recommend against doing this: your readers will be quite puzzled and probably mistake the row vector as an exponent to the column vector.

\documentclass{article}
\usepackage{amsmath}
\usepackage{delarray} % for the wrong kind of alignment

\begin{document}
\begin{equation}
A = \begin{pmatrix}
  A_{00} \\
  A_{01} \\
  A_{10} \\
  A_{11}
\end{pmatrix}
\begin{pmatrix}
  A^*_{00} & A^*_{01} & A^*_{10} & A^*_{11}
\end{pmatrix}
\end{equation}

\begin{equation}
A =
\begin{gathered}
\begin{array}[t]({@{}c@{}})
  A_{00} \\
  A_{01} \\
  A_{10} \\
  A_{11}
\end{array}
\begin{array}[t]({@{}cccc@{}})
  A^*_{00} & A^*_{01} & A^*_{10} & A^*_{11}
\end{array}
\end{gathered}
\end{equation}

\end{document}

The typesetting in equation (1) is the standard (and non confusing one).

Answer 2

For example:

$$
  A = \pmatrix{A_{00}\cr A_{01}\cr A_{02}\cr A_{03}}
      \matrix{\pmatrix{A^*_{00} & A^*_{01} & A^*_{10} & A^*_{11}}\cr\cr\cr\cr}
  \eqno (1)
$$

Answer 3

Like this?

\documentclass{article}
\usepackage{mathtools}

\begin{document}

\begin{equation}
A =\begin{pmatrix} A_{00} \\ A_{01} \\ A_{10} \\ A_{11} \end{pmatrix} \begin{matrix} \begin{pmatrix}  A_{00}^* & A_{01}^* & A_{10}^* & A_{11}^* \end{pmatrix}\\[2.8ex] \\ \\\end{matrix}
\end{equation}

\end{document}