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anonymous

  • 5 years ago

How do I enter a matrix in the equation editor?

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  1. anonymous
    • 5 years ago
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    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).

  2. anonymous
    • 5 years ago
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    Next, do you want big parentheses around the matrix ( ) or big square brackets [ ]?

  3. anonymous
    • 5 years ago
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    If you want ( ) you start each matrix with \left( and end it with \right). Alternately, you would use \left[ and \right]

  4. anonymous
    • 5 years ago
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    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.

  5. anonymous
    • 5 years ago
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    then in each row, a11&a12&a13\\ and so on the last row doesn't use \\ then at the end we use \end{array}

  6. anonymous
    • 5 years ago
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    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 \

  7. anonymous
    • 5 years ago
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    testing... \[ \left[ \begin{array}{cc} a & b \\ c & d \end{array} \right] \] Nice. Thanks!

  8. anonymous
    • 5 years ago
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    You're welcome.

  9. anonymous
    • 5 years ago
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    Glad to help.

  10. anonymous
    • 5 years ago
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    wait, why's that "a" not line the others?

  11. anonymous
    • 5 years ago
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    I don't know. It seems to do that on the first one for some reason.

  12. anonymous
    • 5 years ago
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    Huh. and it's not doing it in the preview. weird.

  13. shadowfiend
    • 5 years ago
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    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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