1. ## Parenthesis in Matrices

How do you put a dot-dot-dot in matrices? My current attempt of

\left(
\begin{array}{ccc}
\delta & 0 & 0 & \ldots & 0 \\
0 & \delta & 0 & \ldots & 0 \\
0 & \ldots & 0 & \delta \end{array}
\right)

doesn't work...

Also, how would I make it go down the way too...?

(I meant to say "ellipsis" not "parenthesis" in the title...)

2. Originally Posted by Swlabr
How do you put parenthesis in matrices? My current attempt of

\left(
\begin{array}{ccc}
\delta & 0 & 0 & \ldots & 0 \\
0 & \delta & 0 & \ldots & 0 \\
0 & \ldots & 0 & \delta \end{array}
\right)

doesn't work...
Hi Swlabr,

I'm not sure of the contents of your matrix, but you didn't have enough columns indicated in your {ccccc} to match the elements in your matrix. And your third row only has 3 columns. Here's an example. See if you can work from this.

\left(
\begin{array}{ccccc}
\delta & 0 & 0 & \ldots & 0 \\
0 & \delta & 0 & \ldots & 0 \\
0 & \ldots & 0 & \delta & 0 \\
\end{array}
\right)

Hi Swlabr,

I'm not sure of the contents of your matrix, but you didn't have enough columns indicated in your {ccccc} to match the elements in your matrix. Your first row and second row have 5 columns each. Your third row only has 4. Here's an example. See if you can work from this.

$\displaystyle \left( \begin{array}{ccccc} \delta & 0 & 0 & \ldots & 0 \\ 0 & \delta & 0 & \ldots & 0 \\ 0 & \ldots & 0 & \delta & 0 \\ \end{array} \right)$

3. Originally Posted by masters
Hi Swlabr,

I'm not sure of the contents of your matrix, but you didn't have enough columns indicated in your {ccccc} to match the elements in your matrix. And your third row only has 3 columns. Here's an example. See if you can work from this.
Ohh - that'll teach me just to copy and paste commands. Thanks!

I suppose my next question is, how do I make

$\displaystyle \left( \begin{array}{ccccc} \delta & 0 & 0 & \cdots & 0 \\ 0 & \delta & 0 & \cdots & 0 \\ \vdots & \vdots & \vdots & \vdots & \vdots \\ 0 & \cdots & 0 & 0 & \delta \end{array} \right)$

look nice? I would be much nicer to have some diagonal dots...

4. Originally Posted by Swlabr
Ohh - that'll teach me just to copy and paste commands. Thanks!

I suppose my next question is, how do I make

$\displaystyle \left( \begin{array}{ccccc} \delta & 0 & 0 & \cdots & 0 \\ 0 & \delta & 0 & \cdots & 0 \\ \vdots & \vdots & \vdots & \vdots & \vdots \\ 0 & \cdots & 0 & 0 & \delta \end{array} \right)$

look nice? I would be much nicer to have some diagonal dots...
Take a look at this site. It should answer your questions. Use \ddots for diagonal dots.