Writing Matrices on One Row & Labeling - LaTeX

[ladil123]

Hello!

I know how to do a matrice in latex like this:
\[
\begin{bmatrix}
a & b & c \\
d & e & f \\
g & h & i
\end{bmatrix}
\]

How do I write severell matrices on one row like : "matrix_A times another matrix_B = answer "

And how can I label the matrices so I can refer to them later on ?
Thanks

 

[Hootenanny]

Hello!

I know how to do a matrice in latex like this:
\[
\begin{bmatrix}
a & b & c \\
d & e & f \\
g & h & i
\end{bmatrix}
\]

How do I write severell matrices on one row like : "matrix_A times another matrix_B = answer "

And how can I label the matrices so I can refer to them later on ?
Thanks

Like this,

\[
 \begin{bmatrix}
  a & b & c \\
  d & e & f \\
  g & h & i
 \end{bmatrix}
 \begin{bmatrix}
  a & b & c \\
  d & e & f \\
  g & h & i
 \end{bmatrix}
=
 \begin{bmatrix}
  a & b & c \\
  d & e & f \\
  g & h & i
 \end{bmatrix}
\]

With respect to the labelling, do you mean label them by given them a tex label such as \label{matrix1} or simply calling them matrix "A"?

 

[ladil123]

Yes I mean such as \label{matrix1}

Thanks you!

 

[Hootenanny]

Yes I mean such as \label{matrix1}

Thanks you!

As far as I'm aware, there are no macros available for numbering terms within a single equation.

The best you could do would be to label the matrices A,B,C using something like \underbrace and then give the equation a label using \label{matrices}. You could then reference the matrices using something of the form:

"see matrix A in \eqref{matrices}"​

 

[ladil123]

If I have the three matrices that you wrote, then I want to refer to all three at the same time, not only the first matrix or the second.
I don´t know how to use \underbrace..

 

[Hootenanny]

If I have the three matrices that you wrote, then I want to refer to all three at the same time, not only the first matrix or the second.

That's fine then. Simply give the over all equation a label using \label{matrices} and then you can refer to the equation using \eqref{matrices}.

Does that answer your question?

 

[ladil123]

Yes, kind of.
I have written \label{matrix1} after \end{bmatrix} but it doesn't work, where should I write \label{matrix1} in my code ?

 

[Hootenanny]

Yes, kind of.
I have written \label{matrix1} after \end{bmatrix} but it doesn't work, where should I write \label{matrix1} in my code ?

Instead of using the \[ delimiters, which correspond to the displaymath environment, you need to use the equation environment:

\begin{equation}
equation goes here
\label{equation name goes here}
\end{equation}

This will then give your equation a number, which can be referred to using the \eqref{equation name goes here} command.

 

[ladil123]

Thank you very much!

 

[Artemida]

Hello!
I have matrices in my LaTex document. LaTex automatically gives order number to all equations, but it doesn’t numerate matrices. Could you help me and say how I could automatically numerate matrices as equations. Beforehand thank you.