Writing matrices in Gummi LaTeX editor

[Stephen Tashi]

What are some examples of writing matrices in the Gummi latex editor? Something about the syntax used on the forum doesn't work for me when used in Gummi.

 

[DrClaude]

Can you show what you tried that doesn't work?

 

[Stephen Tashi]

This example doesn't work when the underlying LaTex is pasted into the Gummi editor:
\begin{pmatrix} 1 & 0 \\ -1 & 1 \end{pmatrix}

 

[DrClaude]

pmatrix is an extension from amslatex. In the preamble of your tex file, add

\usepackage{amsmath}

and it will work. There are many useful extensions in amsmath and I use it in almost all my documents. See the ftp://ftp.ams.org/pub/tex/doc/amsmath/amsldoc.pdf.

 

[Stephen Tashi]

Thank you DrClaude.
\usepackage{amsmath} in the preamble makes things behave as expected.