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I want to multiply a matrix with a letter, it looks like that:

\documentclass{report}

\usepackage{ngerman}
\usepackage{amsmath}
\begin{document}
 \[ \left( \begin{array}{ccc}
 | &  & |  \\
f_1 & \dots & f_n \\
 | &  & | \end{array}\right)  \mathcal{A} =
 \left( \begin{array}{ccc}
 | &  & |  \\
q_1 & \dots & q_n \\
 | &  & | \end{array} \right)\] 

\end{document}

Is there a chance, that the letter is not so small in comparison to the matrix, so that they have about the same size?

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2  
Via graphicx package, you can use {\raisebox{-1.5ex}{\scalebox{3}{$\mathcal{A}$}}} but the result would not look that nice I guess. –  percusse Dec 4 '12 at 18:16
    
hm true, it looks strange. But thanks anyway. Maybe I will stick to my old variant. –  Adam Dec 4 '12 at 18:20
    
It would maybe look better if you reduce the size of the matrices via smallmatrix variants. –  percusse Dec 4 '12 at 18:22
    
thanks! that does look much better!! –  Adam Dec 4 '12 at 18:26
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1 Answer

As percusse points out, you can resize it using the package graphicx:

{\raisebox{-1.5ex}{\scalebox{3}{$\mathcal{A}$}}}

However, I would say that it looks better "small" than "resized". That would be very inconsistent and weird. I recommend you to stuck with small $A$. However, there're few possible improvements of your code:

\documentclass{report}

\usepackage[ngerman]{babel}
\usepackage{amsmath}
\begin{document}
 \[ \begin{pmatrix}
 | &  & |  \\
f_1 & \cdots & f_n \\
 | &  & | \end{pmatrix}  \mathcal{A} =
 \begin{pmatrix}
 | &  & |  \\
q_1 & \cdots & q_n \\
 | &  & | \end{pmatrix}\] 

\end{document}
  • Do not use ngerman package, use babel with the appropriate option.
  • The package amsmath offers the environment pmatrix for matrices in parentheses, as well as bmatrix for [...], Bmatrix for {...}, vmatrix for |...| and Vmatrix for ||...||.
  • I'm not sure what the verical bars denote (probably a vector written in a column?) but I'm sure I would not understand it as a reader. However, I don't know how to improve it, since the context is missing. If the entries are really column vectors and you defined them properly before, I think that the reader would understand it even without the bars.
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