[Tex/LaTex] Matrix change row or column background

backgroundscolorcolortblmatrices

I have a matrix shown below. I would like to have the whole row green rather than only the cells.

How can I do that?

\begin{equation}\label{eq:appendrow}
\newcommand\x{\times}
\newcommand\y{\colorbox{mygreen}{$1$}}
  \left(\begin{array}{cccc}
    \x  & \x  & \x & \x \\
    0   & \x  & \x & \x \\
    0   & 0   & \x & \x \\
    0   & 0   & 0  & \x \\
    \y  & \y  & \y & \y \\
  \end{array}\right)
\end{equation}

The output is:

enter image description here

Best Answer

You can use \rowcolor, \columncolor, and \cellcolor from the colortbl package, loaded in my example through the xcolor package:

\documentclass{article}
\usepackage{amsmath}
\usepackage[table]{xcolor}

\newcommand\x{\times}
\newcommand\y{\cellcolor{green!10}}

\begin{document}

\begin{equation}\label{eq:appendrow}
  \left(\begin{array}{cccc}
    \rowcolor{red!20}
    \x  & \x  & \x & \x \\
    0   & \x  & \x & \x \\
   \rowcolor{blue!20}
    0   & 0   & \x & \x \\
    0   & 0   & 0  & \x \\
    \y a  &  b  & \y c &  d\\
  \end{array}\right)
\end{equation}

\begin{equation}
  \left(\begin{array}{>{\columncolor{olive!20}}cc>{\columncolor{yellow!20}}cc}
    \x  & \x  & \x & \x \\
    0   & \x  & \x & \x \\
    0   & 0   & \x & \x \\
    0   & 0   & 0  & \x \\
    a  & b  & c & d \\
  \end{array}\right)
\end{equation}

\end{document}

enter image description here