Math & Science ⇒ Matrix with inclined dashed line and big 0

[BastienBastien]

Hi,

I need to make some Matrixes.
I can do simple matrix without any problem.
But, I failed at drawing an inclined, oblique dashed line in a matrix.
\ddots is not a good solution in my case.

On the following matrix, you can see that the dash line goes from the a_{2,1} (second line, first column) element, to the a_{n,n-1} element. This is what I want.

1.png (12.61 KiB) Viewed 9024 times

But on the below matrix, because the size of the two bigs '0' is higher, there is a shift between the dashed line and the "destination" '1' element.

2.png (9.25 KiB) Viewed 9024 times

First question : do you think it would be better to draw these bigs '0' by using Tikz ? If yes, how could I do it ?

Second question : do you know how to draw the dash line in a right way, without shift ? By using Tikz ? If yes, how could I do it ?

With best regards,
BastienBastien

[Stefan Kottwitz]

What is your current code for this matrix?

You could use the blkarray package. Sure, TikZ can be used to draw more freely. I would just check out blkarray and bigdelim before. Also, it could be easier sometimes to use \raisebox for small tweaks.

Stefan

[BastienBastien]

Hello,

Thanks for your answer.
I had a look on the packages you told me but I am not quite this could help.
Here is the code I did :

2.png (47.58 KiB) Viewed 8995 times

1.png (64.02 KiB) Viewed 6633 times

Thanks !!!!
BastienBastien

[Stefan Kottwitz]

It would be better if you would post your code as text, copy&paste. There's a code button above the edit field for automatic markup. We cannot copy code from images without typing every line, so I guess nobody tests long code from screenshots.

Stefan

[BastienBastien]

Hello,

Here is the preambule :

Code: Select all

\documentclass[10pt,a4paper,final]{report} 
\usepackage[utf8]{inputenc} 
\usepackage[francais]{babel} 
\usepackage[T1]{fontenc} 
\usepackage{amsmath} 
\usepackage{amssymb} 
\usepackage[]{hyperref}
\usepackage{moreverb}l'indentation) 
\usepackage{marvosym}
\usepackage{schemabloc}
\usepackage{steinmetz}
\usepackage{color} 
\usepackage{fancyhdr} 
\usepackage[squaren, Gray, cdot]{SIunits}
\usepackage{mathtools,mathrsfs} 
 
\usepackage[left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry} 
 
\begin{document}

Then the Matrix's code :

Code: Select all

$ \dot{x} = 
\begin{bmatrix} 
-a_1		& 	-a_2			&	\cdots	&\cdots				& -a_n\\ 
1			&       			&			&  					& 0\\ 
0			&       \ddots		&			&\text{\huge{0}}	& \vdots\\ 
\vdots		&       \text{\huge{0}}		&	\ddots	&		 			& \vdots\\ 
0  			& 		\cdots		&	0		&	1	 			& 0\\ 
\end{bmatrix} 
x+ 
\begin{bmatrix} 
1		\\ 
0		\\ 
\vdots	\\ 
\vdots	\\ 
0 	\\ 
\end{bmatrix} 
u$\\ \\ 
 
$ y = 
\begin{bmatrix} 
b_1	& 	b_2	&	\cdots	& \cdots	& b_n\\ 
\end{bmatrix} 
x+ 
\begin{bmatrix} 
0		\\ 
\end{bmatrix} 
u$\\

\end{document}

Thanks !
BastienBastien

[BastienBastien]

Hello dear LaTeX2e users !

No idea ?
Do not waste your time, but if one of you has an idea, a path which I could follow, investigate, or some keywords, it would be great.

Regards,
Enjoy sunday evening before going back to work... !