Align matrices in Texmaker

Question

I'm new to LaTeX and I wanna know how to make exactly this with LaTeX code.

I tried to use eqnarray to get the numbers but I get errors. Also, I tried to align the last 3 matrices but they all get centered and get appeared in a row one after another.

My code:

\[
\textbf{I=}\begin{pmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{pmatrix}
\]

\[
\textbf{I=}\begin{bmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{bmatrix}
\]

\[
\textbf{I=}\begin{Bmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{Bmatrix}
\]

\[
\textbf{I=}\begin{vmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{vmatrix}
\]

\[
\textbf{I=}\begin{Vmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{Vmatrix}
\]

[ \textbf{I=}\begin{pmatrix} 1&0&0&0 \ 0&1&0&0 \ 0&0&1&0 \ 0&0&0&1 \end{pmatrix} ]
[ \textbf{I=}\begin{bmatrix} 1&0&0&0 \ 0&1&0&0 \ 0&0&1&0 \ 0&0&0&1 \end{bmatrix} ]

[ \textbf{I=}\begin{Bmatrix} 1&0&0&0 \ 0&1&0&0 \ 0&0&1&0 \ 0&0&0&1 \end{Bmatrix} ]

[ \textbf{I=}\begin{vmatrix} 1&0&0&0 \ 0&1&0&0 \ 0&0&1&0 \ 0&0&0&1 \end{vmatrix} ]

[ \textbf{I=}\begin{Vmatrix} 1&0&0&0 \ 0&1&0&0 \ 0&0&1&0 \ 0&0&0&1 \end{Vmatrix} ] — Georgio3, Dec 18 '16 at 20:59

score 3 · Accepted Answer · edited Dec 19 '16 at 11:35

In general you should never have multiple display math environments (like \[ ... \] or \begin{equation} .. \end{equation}) after each other. The amsmath package provides several environments for multi-line displayed math. In this case, you want the gather environment I think.

After the first and the second matrix I added a linebreak with \\. After the third and the fourth, I added some horizontal space with \qquad.

Note also that you should have \mathbf{I}=.., not \textbf{I=}. With the latter you get the wrong spacing around the =.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{gather}
\mathbf{I}=\begin{pmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{pmatrix}
\\
\mathbf{I}=\begin{bmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{bmatrix}
\\
\mathbf{I}=\begin{Bmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{Bmatrix},
\qquad
\mathbf{I}=\begin{vmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{vmatrix},
\qquad
\mathbf{I}=\begin{Vmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{Vmatrix}
\end{gather}

\end{document}

Another possibility might be using align instead of gather, and add a & before selected =, to align those horizontally.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
\mathbf{I}&=\begin{pmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{pmatrix}
\\
\mathbf{I}&=\begin{bmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{bmatrix}
\\
\mathbf{I}=\begin{Bmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{Bmatrix},
\qquad
\mathbf{I}&=\begin{vmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{vmatrix},
\qquad
\mathbf{I}=\begin{Vmatrix}
1&0&0&0 \\
0&1&0&0 \\
0&0&1&0 \\
0&0&0&1
\end{Vmatrix}
\end{align}
\end{document}

score 1 · Answer 2 · edited Dec 19 '16 at 11:47

1

Here are two codes to do that:

\documentclass{article}
\usepackage{mathtools}
\usepackage{makecell}
\setcellgapes{2pt}

\begin{document}


\[ \makegapedcells \begin{matrix*}[l]   
  & \mathbf{I=}\begin{pmatrix} 1&0&0&0 \\ 0&1&0&0 \\ 0&0&1&0 \\ 0&0&0&1 \end{pmatrix}\\
  &  \mathbf{I=}\begin{bmatrix} 1&0&0&0 \\ 0&1&0&0 \\ 0&0&1&0 \\ 0&0&0&1 \end{bmatrix}\\
  \mathbf{I=}\begin{Bmatrix} 1&0&0&0 \\ 0&1&0&0 \\ 0&0&1&0 \\ 0&0&0&1 \end{Bmatrix},
  & \mathbf{I=}\:\begin{vmatrix}\, 1&0&0&0\, \\\, 0&1&0&0 \,\\\, 0&0&1&0\,\\ \,0&0&0&1 \,\end{vmatrix},
  &  \mathbf{I=}\begin{Vmatrix} 1&0&0&0 \\ 0&1&0&0 \\ 0&0&1&0 \\ 0&0&0&1 \end{Vmatrix}
  \end{matrix*} \]


  \begin{alignat}{3}
      &   & \mathbf{I=}& \begin{pmatrix} 1 & 0 & 0 & 0 \\ 0&1&0&0 \\ 0&0&1&0 \\ 0&0&0&1 \end{pmatrix}\\
      &   & \mathbf{I=}& \begin{bmatrix} 1 & 0 & 0 & 0 \\ 0&1&0&0 \\ 0&0&1&0 \\ 0&0&0&1 \end{bmatrix}\\
    & \mathbf{I=}\begin{Bmatrix} 1&0&0&0 \\ 0&1&0&0 \\ 0&0&1&0 \\ 0&0&0&1 \end{Bmatrix},
    &\quad  \mathbf{I=}& \:\begin{vmatrix}\, 1&0&0&0\, \\\, 0&1&0&0 \,\\\, 0&0&1&0\,\\ \,0&0&0&1 \,\end{vmatrix},
    & \quad \mathbf{I=}& \begin{Vmatrix} 1&0&0&0 \\ 0&1&0&0 \\ 0&0&1&0 \\ 0&0&0&1 \end{Vmatrix}
  \end{alignat}

\end{document}

edited Dec 19 '16 at 11:47

Budo Zindovic

373

answered Dec 18 '16 at 21:35

Bernard

271,350

I think that the original image displays equation numbers on the right. – Budo Zindovic Dec 18 '16 at 21:39
I hadn't notice. In such a case you need the second solution, just unstarring alignat*. Please see my updated answer if it's OK. – Bernard Dec 18 '16 at 21:44
what's the purpose of including the = within the \mathbf scope? it has no effect. – barbara beeton Dec 18 '16 at 21:58
It was so in the OP. Don't know if there was a serious reason for this. – Bernard Dec 18 '16 at 21:59
There are a few commas missing in the solution. – Budo Zindovic Dec 19 '16 at 10:48
@Budo Zindovic: I know, but I removed them for consistency. The first two rows have no comma. Anyway, it's easy to add them. – Bernard Dec 19 '16 at 10:51
@Bernard: No problem, I was merely referring to the images posted by the OP. – Budo Zindovic Dec 19 '16 at 10:54

score 0 · Answer 3 · edited Apr 13 '17 at 12:35

0

Every matrix should be an element of a super-matrix. See the answer in this post.

You can also do it like this. Put \usepackage{amsmath} in your preamble and then put this in you document:

\begin{align}
&& FIRST MATRIX && \\
&& SECOND MATRIX && \\
THIRD MATRIX, && FOURTH MATRIX, && FIFTH MATRIX
\end{align}

Every row will have equation number on the right.

You can just fill the placeholders with your own matrices.

edited Apr 13 '17 at 12:35

Community

1

answered Dec 18 '16 at 20:52

Budo Zindovic

373

Which means what exactly? – Georgio3 Dec 18 '16 at 20:54
I've added an example from tex.stackexchange.com. – Budo Zindovic Dec 18 '16 at 20:56
Still dont get it – Georgio3 Dec 18 '16 at 20:58
In the {} i dont write anything right? In FIRST MATRIX, SECOND MATRIX etc position i onsert only the numbers with the &? – Georgio3 Dec 18 '16 at 21:13
You just write your first matrix instead of FIRST MATRIX, etc. Instead of FIRST MATRIX, you should put \textbf{I=}\begin{pmatrix} 1&0&0&0 \\ 0&1&0&0 \\ 0&0&1&0 \\ 0&0&0&1 \end{pmatrix} – Budo Zindovic Dec 18 '16 at 21:17

Align matrices in Texmaker

3 Answers3