Here's a version of the formula environment that works in LyX.
\newcounter{formula}
\newenvironment{Formula}%
{%
\begin{list}{\theformula}%
{%
\setlength{\labelwidth}{\leftmargin - \labelsep}%
\let\olditem=\item%
\renewcommand{\item}{\refstepcounter{formula}\olditem}%
\renewcommand{\makelabel}[1]{(##1)\hfil}%
}%
}
{%
\end{list}
}
%End Formula environment
Note that this does not include the optional argument for creating a
cross-reference, since that would not make so much sense in LyX. (The
crossref would not appear in the references menu.)
The issue in getting the formula environment to work in LyX is this. As
I originally designed the environment (see my previous note), it was a
one-item list. If you wanted more than one formula, you had to use the
environment multiple times. But, in LyX, if you have successive Formula
environments, where these are defined as List_Environments, they are
treated as a /single/ Formula environment with multiple items. Wrong
result, since LyX will then output a bunch of \item commands, whereas
what we wanted was a bunch of \begin{Formula} commands. If you instead
use "LatexType Environment", then you get a single environment with
multiple paragraphs. (I've filed an enhancement request to resolve this
issue.)
The obvious thing to do would seem to be this:
\newenvironment{Formula}[1][xxx]%
{%
\begin{list}{\theformula}%
{%
\setlength{\labelwidth}{\leftmargin - \labelsep}%
\renewcommand{\makelabel}[1]{\refstepcounter{formula}(##1)\hfil}%
}%
}
{%
\end{list}
}
%End Formula environment
So we're now stepping the counter /inside/ the \makelabel command, which
is called by \item, so the counter gets stepped each time.
Unfortunately, this simply doesn't work, because \refstepcounter doesn't
seem to do what it's meant to do here. The solution that does work is
the one above, where we redefine the \item command to step the counter
there.
Here's a layout, for those who are interested:
Style Formula
Margin First_Dynamic
LatexType List_Environment
LatexName Formula
NextNoIndent 1
LabelSep xxxxxx
LeftMargin MMM
ParSkip 0.4
ItemSep 0.2
TopSep 0.7
BottomSep 0.7
ParSep 0.3
Align Block
AlignPossible Block, Left
LabelType Counter
LabelCounter formula
LabelString "(\arabic{formula})"
LabelFont
Shape Up
Series Bold
EndFont
#define the environment
Preamble
\usepackage{calc}
\usepackage{prettyref}
\newcounter{formula}
\newenvironment{Formula}%
{%
\begin{list}{\theformula}%
{%
\setlength{\labelwidth}{\leftmargin - \labelsep}%
\let\olditem=\item%
\renewcommand{\item}{\refstepcounter{formula}\olditem}%
\renewcommand{\makelabel}[1]{(##1)\hfil}%
}%
}
{%
\end{list}
}
%End Formula environment
\newrefformat{For}{(\ref{#1})}
EndPreamble
End
Richard Heck
