anonymous
  • anonymous
How do I enter a matrix in the equation editor?
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
I don't even bother with the editor. It's a little tricky, but it's called LaTeX. The first thing you want to do is enclose everything in between \ [ and \ ] (no spaces).
anonymous
  • anonymous
Next, do you want big parentheses around the matrix ( ) or big square brackets [ ]?
anonymous
  • anonymous
If you want ( ) you start each matrix with \left( and end it with \right). Alternately, you would use \left[ and \right]

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anonymous
  • anonymous
To get the actual matrix, we use \begin{array}{cccc} where the number of c's we use is the same as the number of columns.
anonymous
  • anonymous
then in each row, a11&a12&a13\\ and so on the last row doesn't use \\ then at the end we use \end{array}
anonymous
  • anonymous
So for the matrix \[\left[\begin{array}{cccc} a_{11}&a_{12}&\ldots&a_{1n}\\ a_{21}&a_{22}&\ldots&a_{2n}\\ \vdots&\vdots&\ddots&\vdots\\ a_{n1}&a_{n2}&\ldots&a_{nn} \end{array}\right]\] I use \ [\left[\ begin{array}{cccc} a_{11}&a_{12}&\ldots&a_{1n}\\ a_{21}&a_{22}&\ldots&a_{2n}\\ \vdots&\vdots&\ddots&\vdots\\ a_{n1}&a_{n2}&\ldots&a_{nn} \end{array}\right]\] Where you take out the the spaces after the first and third \
anonymous
  • anonymous
testing... \[ \left[ \begin{array}{cc} a & b \\ c & d \end{array} \right] \] Nice. Thanks!
anonymous
  • anonymous
You're welcome.
anonymous
  • anonymous
Glad to help.
anonymous
  • anonymous
wait, why's that "a" not line the others?
anonymous
  • anonymous
I don't know. It seems to do that on the first one for some reason.
anonymous
  • anonymous
Huh. and it's not doing it in the preview. weird.
shadowfiend
  • shadowfiend
By the way, FYI -- you can leave off the \ on most LaTeX commands *in the editor*. Right now, that doesn't work in the reply box directly, though we *may* add that.

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