Effortlessly Create a Matrix in Latex: Step-by-Step Guide

In summary, the conversation discusses producing a matrix in LaTeX using the code for \begin{bmatrix} and \left[\begin{array}. The conversation also addresses an error that occurs when creating the matrix and options for changing the maximum number of columns in a matrix. The conversation concludes with a discussion on the advantages of using \begin{bmatrix} over \left[\begin{array}.
  • #1
ryan88
42
0
Hi,

I am trying to produce a matrix in Latex with the following code:
Code:
\begin{bmatrix}
1 & 0 & 0 & 0 & 0 & 0 & 0 & -4 & 1 & 0 & 0 & 0 & 0 & 0 \\
0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 & 0 & 0 \\
0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 & 0 \\
0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 \\
0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 \\
0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 \\
0 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4
\end{bmatrix}
But I keep on getting the following error:
Extra alignment tab has been changed to \cr.<recently read> \endtemplate

This error occurs for each row in that matrix.

I would appreciate any help anyone can give,

Thanks,

Ryan
 
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  • #2
I create matrices like this

Code:
\begin{equation}

\left[
 \begin{array}{ccc}
   1 & 0 & 0\\
   0 & 1 & 0\\
   0 & 0 & 1
 \end{array}
\right]

\end{equation}
 
  • #3
I just copied your code into tex and it gives

[tex]\begin{bmatrix}
1 & 0 & 0 & 0 & 0 & 0 & 0 & -4 & 1 & 0 & 0 & 0 & 0 & 0 \\
0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 & 0 & 0 \\
0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 & 0 \\
0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 \\
0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 \\
0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 \\
0 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4
\end{bmatrix}[/tex]
Is there a maximum of 10 columns in a matrix?

If we try to do it "by hand" (using \begin{array})
[tex]\left[\begin{array}{cccccccccccccc}
1 & 0 & 0 & 0 & 0 & 0 & 0 & -4 & 1 & 0 & 0 & 0 & 0 & 0 \\
0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 & 0 & 0 \\
0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 & 0 \\
0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 \\
0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 \\
0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 \\
0 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4
\end{array}\right][/tex]

The code for that is
\left[\begin{array}{cccccccccccccc}
1 & 0 & 0 & 0 & 0 & 0 & 0 & -4 & 1 & 0 & 0 & 0 & 0 & 0 \\
0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 & 0 & 0 \\
0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 & 0 \\
0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 & 0 \\
0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 & 0 \\
0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4 & 1 \\
0 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & -4
\end{array}\right]

Notice that, using \begin{array}, you need to put in the braces (\left[ and \right]) yourself (so you could use ( ), { }, etc.). The {cccccccccccccc} (14 c's) tells LaTex there are 14 columns.
 
Last edited by a moderator:
  • #4
Thanks, that worked great.

Ryan
 
  • #5
(I believe) There is a default for the maximum number of columns in the matrix environments, and that it is possible to change it in your document.

I don't have the pertinent information at my fingertips now; perhaps a search of tug.org
or some other site would be fruitful.
Edit: spoke too soon: from AMS math documentation, footnote on page 10.

More precisely: The maximum number of columns in a matrix is determined by the
counter MaxMatrixCols (normal value = 10), which you can change if necessary using LATEX’s
\setcounter or \addtocounter commands.
 
  • #6
Thanks statdad.

Is there any advantage of using \begin{bmatrix} over \left[\begin{array}?

Ryan
 
  • #7
ryan88 said:
Thanks statdad.

Is there any advantage of using \begin{bmatrix} over \left[\begin{array}?

Ryan

That I can't say, as I use the "bmatrix" environment exclusively. As some other posters have shown, it is possible to control column alignment in arrays; I don't know of a similar feature with the matrix environments.
 
  • #8
Ok thanks
 

1. How do I create a matrix in Latex?

To create a matrix in Latex, you can use the "bmatrix" environment or the "array" environment. The "bmatrix" environment is recommended for simpler matrices, while the "array" environment allows for more customization.

2. How do I add elements and format my matrix in Latex?

To add elements to your matrix, use the "&" symbol to separate columns and "\\" to separate rows. You can use commands such as "\pmatrix" for parentheses or "\begin{vmatrix}" for vertical bars to format your matrix. Additionally, you can use commands like "\hline" to add horizontal lines for clarity.

3. How do I align my matrix in Latex?

To align your matrix, you can use the "align" environment. Within this environment, you can use the "&" symbol to indicate where to align the columns. For example, "&=" will align the columns at the equal sign. You can also use the "center" environment for centered alignment.

4. How do I label and reference my matrix in Latex?

To label your matrix, use the "\label" command after the "\begin{bmatrix}" or "\begin{array}" command. Then, to reference the matrix in your text, use the "\ref" command followed by the label name. This will automatically generate the correct number for your matrix.

5. How do I insert a matrix in an equation in Latex?

To insert a matrix within an equation, use the "array" environment within the "\begin{equation}" and "\end{equation}" commands. You can then use the "&" symbol to indicate where to align the columns, just like in the "align" environment. This will allow you to insert a matrix as part of a larger equation.

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