I have a column vector multiplies by a row vector. I want to align the row vector with the first entry of the column vector.
I would appreciate any feedback.
[Tex/LaTex] How to align a row vector and column vector such that the row align to the first entry of the column
matrices
Related Solutions
You can use an array to create a vector. See section 3 of the Not so Short Guide to LaTeX for more details.
\documentclass{article}
\begin{document}
\[
\mathbf{U}_I =
\left[
\begin{array}{c}
\mathrm{d}x \\
\mathrm{d}y \\
\mathrm{d}\theta
\end{array}
\right]
\]
\end{document}
The spacing around between the elements and the brackets can be reduced by replacing {c} with {@{}c@{}}. You could also consider using the bmatrix environment from the amsmath package. Note that \[ and \] create an equation that is not numbered. If you need a numbered equation you should use \begin{equation} and \end{equation} instead.
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).
Best Answer
This should work for simple vectors, but you may need
\vphantominstead of\mathstrutfor larger entries.