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Math Help - Parenthesis in Matrices

  1. #1
    MHF Contributor Swlabr's Avatar
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    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...)
    Last edited by Swlabr; February 15th 2010 at 09:52 AM.
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  2. #2
    A riddle wrapped in an enigma
    masters's Avatar
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    Quote Originally Posted by Swlabr View Post
    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.

    \left(<br />
\begin{array}{ccccc}<br />
\delta & 0 & 0 & \ldots & 0 \\<br />
0 & \delta & 0 & \ldots & 0 \\<br />
0 & \ldots & 0 & \delta & 0 \\<br />
\end{array}<br />
\right)
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  3. #3
    MHF Contributor Swlabr's Avatar
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    Quote Originally Posted by masters View Post
    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

    \left(<br />
\begin{array}{ccccc}<br />
\delta & 0 & 0 & \cdots & 0 \\<br />
0 & \delta & 0 & \cdots & 0 \\<br /> <br />
\vdots & \vdots & \vdots & \vdots & \vdots \\<br /> <br />
0 & \cdots & 0 & 0 & \delta \end{array}<br />
\right)

    look nice? I would be much nicer to have some diagonal dots...
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  4. #4
    A riddle wrapped in an enigma
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    Quote Originally Posted by Swlabr View Post
    Ohh - that'll teach me just to copy and paste commands. Thanks!

    I suppose my next question is, how do I make

    \left(<br />
\begin{array}{ccccc}<br />
\delta & 0 & 0 & \cdots & 0 \\<br />
0 & \delta & 0 & \cdots & 0 \\<br /> <br />
\vdots & \vdots & \vdots & \vdots & \vdots \\<br /> <br />
0 & \cdots & 0 & 0 & \delta \end{array}<br />
\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.
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