Math & Science ⇒ Diagonal Arrows in a Matrix

[elim]

I don't know how to name it but wonder if the following can be specified by latex?

d_grph.jpg (29.04 KiB) Viewed 7700 times

Thanks for your advise

[nlct]

You can use tikz (part of the pgf package) for that kind of thing.

Code: Select all

\documentclass{article}

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\matrix (M)
{
  \node (x11) {$x_{11}$}; & \node (x12) {$x_{12}$}; 
   & \node (x13) {$x_{13}$}; & \node (x14) {$x_{14}$}; 
   & \node {\ldots};\\
  \node (x21) {$x_{21}$}; & \node {$x_{22}$}; & \node {$x_{23}$};
   & \node {$x_{24}$}; & \node {\ldots};\\
  \node (x31) {$x_{31}$}; & \node {$x_{32}$}; & \node {$x_{33}$};
   & \node {$x_{34}$}; & \node {\ldots};\\
  \node (x41) {$x_{41}$}; & \node {$x_{42}$}; & \node {$x_{43}$};
   & \node {$x_{44}$}; & \node {\ldots};\\
  \node {\ldots}; & \node {\ldots}; & \node {\ldots};
   & \node {\ldots}; & \node {\ldots};\\
};
\draw[->] (x11.south west) -- (x11.north east);
\draw[->] (x21.south west) -- (x12.north east);
\draw[->] (x31.south west) -- (x13.north east);
\draw[->] (x41.south west) -- (x14.north east);
\end{tikzpicture}

\end{document}

Regards
Nicola Talbot

[Stefan Kottwitz]

Hi Elim!

Nicola already gave very good advice. Just a small addition, the code would be shorter and more readable if we would use the TikZ matrix library. Here's the code example of Nicola, using it:

Code: Select all

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{matrix}
\begin{document}

\begin{tikzpicture}
\matrix (m) [matrix of math nodes]
{
  x_{11} & x_{12} & x_{13} & x_{14} & \ldots \\
  x_{21} & x_{22} & x_{23} & x_{24} & \ldots \\
  x_{31} & x_{32} & x_{33} & x_{34} & \ldots \\
  x_{41} & x_{42} & x_{43} & x_{44} & \ldots \\
  \ldots & \ldots & \ldots & \ldots & \ldots \\
};
\draw[->] (m-1-1.south west) -- (m-1-1.north east);
\draw[->] (m-2-1.south west) -- (m-1-2.north east);
\draw[->] (m-3-1.south west) -- (m-1-3.north east);
\draw[->] (m-4-1.south west) -- (m-1-4.north east);
\end{tikzpicture}

\end{document}

And the output:

matrix.png (5.6 KiB) Viewed 7688 times

Stefan

[elim]

Thanks a lot nlct and Stefan_K! Very nice solution!