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I'm new to latex and all of my matrices seem to be created on new lines, I can't seem to put them side by side. Here is what I am doing to make a matrix (with the 2d identity matrix as an example):

\[ \left( \begin{array}{cc}
1 & 0 \\
0 & 1
\end{array} \right) \]

Am I making it wrong? How can I place a second matrix directly beside this, as you would when doing matrix mathematics? Thanks

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3 Answers 3

up vote 14 down vote accepted

Don't enclose each array with \[ ... \]; instead, put all the arrays that you want together within one set of delimeters. Like this:

\[ \left( \begin{array}{cc}
1 & 0 \\
0 & 1
\end{array} \right)
%
\left( \begin{array}{cc}
1 & 0 \\
0 & 1
\end{array} \right)
\]

You should read the mathmode documentation. It should be part of your TeX Distribution, and has lots of examples to follow.

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This makes sense. However, does this still handle things like [Matrix][vector] = [vector] all one one line? –  user3231 Jan 29 '11 at 20:49
    
@bbel Sure. As long as they will fit on the same line, you can just put them one after another like this (no blank lines in between which is why I separated the two matrices in my example with a % (comment character)). –  Alan Munn Jan 29 '11 at 20:52

This is slightly tangential, but you might find it convenient to use the pmatrix environment (defined in amsmath.sty)

\[
\begin{pmatrix}
  1 & 0 \\ 0 & e^{i\pi/k}
\end{pmatrix}
\begin{pmatrix}
  u \\ v
\end{pmatrix}
=
\begin{pmatrix}
  u \\ -v
\end{pmatrix}
\]
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like this

\[ \left( \begin{array}{cc}
1 & 0 \\
0 & 1
\end{array} \right) \times \left( \begin{array}{cc}
1 & 0 \\
0 & 1
\end{array} \right) =\left( \begin{array}{cc}
1 & 0 \\
0 & 1
\end{array} \right)\] 

You need to place the matrices inside the math environment

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Inside the math environment by surrounding them with the dollar sign operator? Because that gives me errors in itself.. –  user3231 Jan 29 '11 at 20:45
1  
\[..\] is a math environment When you use this environment the math expression is written on a single line. Like Alan, I think you should read the mathmode.pdf documentation from Herbert Voss. –  Alain Matthes Jan 29 '11 at 21:18

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