Math & Science ⇒ How to write a code for this ?

[M.A]

Hello

How to write a LaTeX code to generate the matrix shown in the following image?

matrix.png (2.16 KiB) Viewed 3363 times

Regards

[localghost]

My first idea was to do this without any additional package.

Code: Select all

\[
%  \renewcommand{\arraystretch}{1.2}
  \left[
  \begin{array}{ccc}
    A_{11} & \multicolumn{1}{c|}{A_{12}} & 0 \\ \cline{2-3}
    A_{21} & \multicolumn{1}{|c|}{A_{22}} & A_{23} \\ \cline{1-2}
    0 & \multicolumn{1}{|c}{A_{32}} & A_{33}
  \end{array}
  \right]
\]

But perhaps there is a more elegant solution.


Best regards
Thorsten

[M.A]

Thanks for the response,
but your code doesn't produce the required result, it produces this:

matrix2.png (1.97 KiB) Viewed 3349 times

Nevertheless, using the same idea, a valid code is:

Code: Select all

\[
  \left[
  \begin{array}{ccc}
    A_{11} & \multicolumn{1}{c|}{A_{12}} & 0 \\ \cline{2-3}
    A_{21} & \multicolumn{1}{|c|}{A_{22}} & 0 \\ \cline{1-2}
    0 & \multicolumn{1}{|c}{A_{32}} & A_{33}
  \end{array}
  \right]
\]

Thanks !
but it doesn't look elegant as you said.

[localghost]

I corrected my code while you were answering. But you are right. Initially I forgot two vertical lines and did a copy & paste error. My sample code was only meant to be a basic structure you could build upon. Perhaps you will find more ideas in the "[url=http://ctan.org&pkg/voss-mathmode]Math mode[/url]" document.

[M.A]

Thanks for the math mode document, it is a comprehensive reference.
Regards,
M.A