3

I try to align a multiline equation, but im getting a large space.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{mathtools}
\begin{document}


\begin{align}
AAAAAA &\,  yyyyy &=& bbbbbb    \\
A    &\,     y  &=&    b  \notag
\end{align}
\end{document}

I would like the letters in the second line to be in the center of the above.

EDIT:

The first line stands for a Matrix equation. With Micos solution i now got:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
\begin{array}[t]{c @{\,} c @{{}={}} c}
 \begin{pmatrix}
  1 & 0  \\
  0 & 1  \\
  0 & 0 \\
\end{pmatrix} & 
\begin{pmatrix}
  x\\
  y\\
\end{pmatrix} & 
\begin{pmatrix}
  x\\
  y \\  
  0\\
\end{pmatrix} \\
A      & x     & d      \\
\end{array}
\end{equation}


\end{document}
4
  • for example the single letter 'A' in the second line should be center to 'AAAAA' from the first line. Nov 6 '14 at 16:35
  • Welcome to TeX.SE! Have you looked into using an array environment?
    – Mico
    Nov 6 '14 at 16:35
  • no i havent, but thats not a math environment, right Nov 6 '14 at 16:41
  • Actually, array is very much the math-mode equivalent of tabular.
    – Mico
    Nov 6 '14 at 16:46
4

You could try:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{mathtools}
\begin{document}
\begin{equation}
\begin{array}[t]{c @{\,} c @{{}={}} c}
AAAAAA & yyyyy & bbbbbb \\
A      & y     & b      \\
\end{array}
\end{equation}
\end{document}

Addendum, to address the OP's follow-up query: To typeset the two versions of the matrix equation you've added to your initial query, I would use nearly the same code as given above, with the exception that I would replace @{\,} with @{} as the separator between the first and second column of the array. This is because, in my not-so-humble opinion..., the spacing between matrix-like environment provided by the amsmath package (which provides the pmatrix environments) is a bit excessive, especially so for the case at hand. (If you do want the default spacing of the amsmath package, just keep the @{\,} inter-column specification as per the initial answer.)

enter image description here

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{mathtools}
\begin{document}
\begin{equation}
\begin{array}[t]{c @{} c @{{}={}} c}
  \begin{pmatrix}
    1 & 0  \\
    0 & 1  \\
    0 & 0 \\
  \end{pmatrix} & 
  \begin{pmatrix}
    x\\
    y\\
  \end{pmatrix} & 
  \begin{pmatrix}
    x\\
    y \\  
    0\\
  \end{pmatrix} \\[4ex]
  A & x & d\\
\end{array}
\end{equation}
\end{document}
3
  • Of course mathtools is not necessary.
    – egreg
    Nov 6 '14 at 16:46
  • thank you, that looks good. how can i change the vspace between first and second line? Nov 6 '14 at 16:56
  • @ArthurSpooner - I've provided an addendum to my answer to address your follow-up query about typesetting a more realistic set of equations.
    – Mico
    Nov 6 '14 at 18:35

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.