[Tex/LaTex] How to create the following diagonal matrix in Latex

matrices

I want to write the above matrix in Latex. Please help.

Best Answer

You can get it by using the pmatrix environment and \dots commands of the mathtools package.

\documentclass{article}

\usepackage{mathtools} 

\begin{document}

\[
  \begin{pmatrix}
    a & 0 & \dots & 0 \\
    0 & 1 & \dots & 0 \\
    \vdots & \vdots & \ddots & \vdots \\
    0 & 0 & \dots & 1
  \end{pmatrix}
\]

\end{document}

Here is the output:

Related Solutions

[Tex/LaTex] How to write code for the following matrix

You can nest the matrix environment:

\documentclass{article}
\usepackage{amsmath}

\begin{document}
    \begin{equation}
        \mathop{\mathbf{adj}}
        \begin{pmatrix}
            a_{11} & a_{12} & a_{13} \\
            a_{12} & a_{22} & a_{23} \\
            a_{31} & a_{32} & a_{33}
        \end{pmatrix}
        =
        \begin{pmatrix}
            +
            \begin{vmatrix}
                a_{22} & a_{23} \\
                a_{32} & a_{33}
            \end{vmatrix} &
            -
            \begin{vmatrix}
                a_{12} & a_{13} \\
                a_{32} & a_{33}
            \end{vmatrix} &
            +
            \begin{vmatrix}
                a_{12} & a_{13} \\
                a_{22} & a_{23} \\
            \end{vmatrix} \\[1.5em]
            -
            \begin{vmatrix}
                a_{21} & a_{23} \\
                a_{31} & a_{33}
            \end{vmatrix} &
            +
            \begin{vmatrix}
                a_{11} & a_{13} \\
                a_{31} & a_{33}
            \end{vmatrix}&
            -
            \begin{vmatrix}
                a_{11} &  a_{13} \\
                a_{21} &  a_{23}
            \end{vmatrix} \\[1.5em]
            +
            \begin{vmatrix}
                a_{21} & a_{22} \\
                a_{31} & a_{32}
            \end{vmatrix} &
            -
            \begin{vmatrix}
            a_{11} & a_{12} \\
            a_{21} & a_{22}
            \end{vmatrix} &
            +
            \begin{vmatrix}
                a_{11} & a_{12} \\
                a_{21} & a_{22}
            \end{vmatrix}
        \end{pmatrix}
    \end{equation}
\end{document}

Diagonal matrix in Latex

I am sure there must be a better way, but you can combine a rotated rule with the brackets and a few hspaces and get kind of close. Note this won't scale vertically so don't try to put fractions (or something else tall) between the brackets. The expression with normal brackets is shown as well for comparison.

\documentclass{article}
\usepackage{rotating}
\newcommand\diagmatrix[1]{[\hspace{-1.6pt}\raisebox{7pt}{\rotatebox{-30}{\rule{1mm}{.15mm}}}\hspace{-1pt}#1\hspace{-1pt}\raisebox{-1pt}{\rotatebox{-30}{\rule{1mm}{.15mm}}}\hspace{-1.6pt}]}
\begin{document}
\[\diagmatrix{m_r}^{-1}\diagmatrix{k_r}\]
\[[m_r]^{-1}[k_r]\]
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] How to write code for the following matrix

Diagonal matrix in Latex

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