[Tex/LaTex] “Preamble” menu item does not appear in LyX

lyxpreamblexy-pic

I'm trying to use xy-pic in LyX to create diagrams and using this tutorial. It says on page 3 to go Layout->Document->Preamble to enable the xy-pic package. However, there is no "Layout" menu on my LyX installation. There is a "Document" menu, but it doesn't contain any option "Preamble."

When I type \xymatrix, the command appears in the autocomplete list. However, when I type \ar within the \xymatrix context to create an arrow, it does not appear. \ar causes compile errors, and both \ar and \xymatrix cause compile errors when used in an evil red text context (between dollar signs) rather than a LyX math context.

I'm using LyX 2.0.1 on a Mac OSX Lion machine. This issue has been a problem in the past as well, but I haven't been able to find any information on it. Any ideas?

Best Answer

Go to Document > Settings > LaTeX Preamble and in there you can type \usepackage[all]{xy}

Note that it doesn't matter whether you have 2.0.4 or 2.0.1 for this particular point but you might as well upgrade.

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[Tex/LaTex] Create new paragraph style in LyX

in the file stdlayouts.inc you can copy the definition for quotation to a part called "myquotation". In the file stdlists you can see at the end how additional preamble commands can be made which are hided from the normal user. After changing your layout file run reconfigure and restart lyx, there should now be a "myquoation" in all styles which support this kind of environment.

Here is an example for an LyX environment MyQuotation

Style MyQuotation
    Category              MainText
    Margin                Static
    LatexType             Environment
    LatexName             myquotation
    NextNoIndent          1
    LeftMargin            MMM
    RightMargin           MMM
    ParIndent             MM
    ParSkip               0
    ItemSep               0
    TopSep                0.5
    BottomSep             0.5
    ParSep                0
    Align                 Block
    AlignPossible         Block, Left, Right, Center
    Preamble
    \usepackage{mdframed}
    \usepackage{xcolor}
    \newenvironment{myquotation}
      {\begin{mdframed}[linecolor=red]\quotation}
      {\endquotation\end{mdframed}}
    EndPreamble
End

insert it into the file stdlayouts.inc and save the file in your local .lyx/layouts/ directory (don't know how it shopuld be on windows). Then run reconfigure and you shouöld see the paagraph layout MyQuotation which then gives a framed output. alt text

[Tex/LaTex] LyX: modify thesis.cls preamble

If you would like to change existing macros of a class file, you can use \renewcommand to redefine them.
If you see the character @ in the code, i.e. in macro names, use need to use \makeatletter before and \makeatother after. See why: What do \makeatletter and \makeatother do.
In LyX, use the menu and go to document settings, to modify the document preamble. Insert the lines for redefinition there. These may now look like
```
\makeatletter
\renewcommand*{\th@signature}[1]{%
  \begin{center}
  ...
  \end{center}%
}
\makeatother
```

An explanation for the star * is given here: What's the difference between \newcommand and \newcommand*. And for the percent signs: What is the use of percent signs at the end of lines.

Best Answer

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[Tex/LaTex] Create new paragraph style in LyX

[Tex/LaTex] LyX: modify thesis.cls preamble

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