[Tex/LaTex] Pagewide (single column) footnote in double column document

footnotesmulticoltwo-column

I am trying to write a long equation in footnote in a double column document (IEEEtran) similar to the attached image. I have tried using "multicols" command but the footnote is starting from the right column and extending out of the page.

I have also tried including the equation in float environment but in that case the figure is placed in the next page and not in the page where I want it be, even though there is enough space.

Please help.

enter image description here

Best Answer

It seems 1-in-2.sty can do the job, which can be used for One-Column Abstract and Footnote in the Two-Column Documents. It has the function:

\mathfootnote{..}

A minimal working example:

\documentclass[twocolumn]{article}
\usepackage{1-in-2}


\title{Title}
%
\author{Author}

\begin{document}

\maketitle

\section{A section}

Blablabla.

An example
\begin{quote}\begin{verbatim}
\mathfootnote{%
 \begin{equation}
 \left\{\begin{array}{c}
  x \\ ...
..........
\end{equation}}
\end{verbatim}\end{quote}
will output an equation in the footnote of this page.

\newcommand{\fat}[1]{\mbox{\boldmath{$#1$}}}
\mathfootnote{
\begin{equation}
\left\{\begin{array}{c} x \\ y \\ z \end{array}\right\}=
\left(\begin{array}{ccc}
 a+b/r                   & c-d/s  & e/f-g \\
                         & h+k/t  & m/n+p \\
 \multicolumn{2}{l}{\mbox{Symm.}} & q-u/v
 \end{array}\right)
\left\{\begin{array}{c} \alpha \\ \beta \\ \gamma \end{array}\right\},
\qquad\mbox{or}\qquad \fat{x}=\fat{C}\,\fat{\lambda}\label{eq:foot}
\end{equation}}

\begin{center} [Eq.(\ref{eq:foot}) is in the footnote.] \end{center}
where $\alpha$ and $\cdots$.


\end{document}

The output:

Update

Having said the above, I couldn't resist the challenge to implement at least a trivial implementation of this. The idea is simple: we offer a command that takes 3 arguments: a page number, a column number, and a float body, e.g.

\multicolfloat{1}{2}{\centering
                     \includegraphics{cat.eps}
                     \captionof{figure}{A test}
                    }

The above is using \captionof from the caption package as this isn't really a float so \caption would complain unless it gets modified which I didn't do.

This command can be used inside a multicols environment and asks for this float to be placed on top column 2 on page 1. So a lot of manual work if the amount of text is changing or the multicols environment is moved. This could be done differently and better, but that is more than I had time for.

So here is the code and a test file, a mixture of patching some hooks into multicol and implementing the new functionality as a LaTeX3 property list.

\begin{filecontents}{multicol-floats.sty}
% Author Frank Mittelbach, 2012, License LPPL
%
% Providing column floats for multicol (proto-type implementation)
%
% Document Interface:   
%
%   \multicolfloat <page-num> <col-num> <float-body>
%
% To be used inside a multicols environment. 
% Can only place floats on full pages not balanced pages.
% Should probably be an environment but didn't do that this time around.
%
% Subject to change and ... No support :-)

\RequirePackage{etoolbox}
\RequirePackageWithOptions{multicol}

% Patching multicol to get a few hooks in as needed

\patchcmd{\multi@column@out}%
  {\setbox\count@ \vsplit\@cclv to\dimen@}%
  {\create@split@column \count@ \dimen@}%
  {\typeout{*** SUCCESS ***}}{\typeout{*** FAIL ***}}

\patchcmd{\multi@column@out}
  {\setbox\mult@rightbox \vsplit\@cclv to\dimen@}
  {\create@split@column \mult@rightbox \dimen@}
  {\typeout{*** SUCCESS ***}}{\typeout{*** FAIL ***}}

\patchcmd\endmulticols
  {\output}{\mc@check@unset@floats\output}
  {\typeout{*** SUCCESS ***}}{\typeout{*** FAIL ***}}

\newcount\mc@column

\patchcmd\process@cols
  {\relax}{\relax\mc@column\@ne}
  {\typeout{*** SUCCESS ***}}{\typeout{*** FAIL ***}}

\patchcmd\process@cols
  {\advance}{\advance\mc@column\@ne\advance}
  {\typeout{*** SUCCESS ***}}{\typeout{*** FAIL ***}}

% Implementation of new functionality

\RequirePackage{xparse}

\ExplSyntaxOn

\DeclareDocumentCommand \multicolfloat { m m m }
   {
     \mc_float:nnn {#1} {#2} {#3} 
   }


% Implementation

\cs_generate_variant:Nn \prop_gpop:NnNT { NxNT }
\cs_generate_variant:Nn \prop_get:NnNTF { NxNTF }

\prop_new:N \__g_mc_float_prop
\tl_new:N   \__l_mc_float_tl

\cs_new:Npn \mc_float:nnn #1#2#3 {
% safe a float body under the property key "page,col"
% if there already exist a float, combine them
   \prop_get:NxNTF \__g_mc_float_prop {#1,#2} \__l_mc_float_tl
       {
         \prop_gput:Nno \__g_mc_float_prop {#1,#2}
            {\__l_mc_float_tl
             \vskip \floatsep
             \vbox{\hsize\columnwidth #3}
            }
       }
       {
         \prop_gput:Nnn \__g_mc_float_prop {#1,#2}
            {\vbox{\hsize\columnwidth #3}}
       }
}

\cs_new:Npn \create@split@column #1#2 {
% look up any saved floats for current page and current column and if they exist
% add them to the to the top of box 255 and then split  off a column
  \prop_gpop:NxNT \__g_mc_float_prop
        {\thepage, \the\mc@column }
        \__l_mc_float_tl
        { 
          \vbox_set:Nn \c_two_hundred_fifty_five
             { \__l_mc_float_tl
               \vskip \textfloatsep
               \vbox_unpack_clear:N \c_two_hundred_fifty_five
             }
        }
  \vbox_set_split_to_ht:NNn #1 \c_two_hundred_fifty_five {#2}
}

\cs_new:Npn \mc@check@unset@floats {
% if the property list is not empty we haven't typeset all floats for some reason
% give error message and a display of the property list content (crude ... but there you go)
  \prop_if_empty:NF \__g_mc_float_prop
     { \PackageError{xmulticol}{Unset~ column~ floats,~ details~ below}
                    { }
       \prop_show:N   \__g_mc_float_prop
       \prop_gclear:N \__g_mc_float_prop
     }
}

\ExplSyntaxOff

\end{filecontents}

\documentclass{article}

\usepackage{lipsum,caption,graphicx}

\usepackage{multicol-floats}

\begin{document}

\begin{multicols}{2}

\multicolfloat{1}{1}{TEST 1-1}

\multicolfloat{1}{2}{\centering
  \includegraphics{cat.eps}
 \captionof{figure}{A test}
}

\multicolfloat{1}{2}{TEST \captionof{figure}{Another test}}

\multicolfloat{2}{1}{TEST 2-1}

\lipsum %\lipsum

\end{multicols}
\end{document}

As a result one gets the following output on the first page with the three floats placed in column one and two:

enter image description here

With only one \lipsum in the test file, the multicols ends on the next page and thus the float for page 2 column one isn't typeset and we get the following error message as well:

! Package xmulticol Error: Unset column floats, details below.

See the xmulticol package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.136 \end{multicols}

? 
The property list \__g_mc_float_prop contains the pairs (without outer
braces):
>  {2,1}  =>  {\vbox {\hsize \columnwidth TEST 2-1}}.
<recently read> }

l.136 \end{multicols}

Not really great :-) but then this is just a proto-type anyway. In fact, if a multicols environment starts in the middle of a page then the float will appear on the top of the column of the multicol not at the top of the page. After all, the column sizes might differ, So that is rather a feature not a bug ... hey anything on this is a feature as I said totally unsupported in this shape --- enjoy nevertheless

[Tex/LaTex] How to get a double column verbatim in a single column table, in a double column document

Here's one possible solution using the twocolumn class option and figure* and two minipages to typeset the listings (since figure* was used, the listings will appear on the top of the next page):

\documentclass[twocolumn]{article}
\usepackage{listings}
\usepackage{lipsum}

\begin{document}

\lipsum[1-6]
\begin{figure*}
\begin{minipage}[t]{0.5\textwidth}
\begin{lstlisting}
if (i<=0) then i := 1;
if (i>=0) then i := 0;
if (i<>0) then i := 0;
\end{lstlisting}
\end{minipage}%
\begin{minipage}[t]{0.5\textwidth}
\begin{lstlisting}
if (i<=0) then i := 1;
if (i>=0) then i := 0;
\end{lstlisting}
\end{minipage}%
\caption{Two  side-by-side listings}
\label{fig:listings}
\end{figure*}
\lipsum[1-6]

\end{document}

enter image description here

And here's now another option: instead of using the twocolumn document option, the multicol package is used to produce the text in two-column mode; the multicols environment is ended, the side-by-side listings are typeset using simple minipages (the caption package was used to produce a possible caption using \captionof), and then another multicols environment begins:

\documentclass{article}
\usepackage{multicol}
\usepackage{listings}
\usepackage{caption}
\usepackage{lipsum}

\begin{document}

\begin{multicols}{2}
\lipsum[1-2]
\end{multicols}
\noindent\begin{minipage}{\textwidth}
\begin{minipage}[t]{0.5\textwidth}
\begin{lstlisting}
if (i<=0) then i := 1;
if (i>=0) then i := 0;
if (i<>0) then i := 0;
\end{lstlisting}
\end{minipage}%
\begin{minipage}[t]{0.5\textwidth}
\begin{lstlisting}
if (i<=0) then i := 1;
if (i>=0) then i := 0;
\end{lstlisting}
\end{minipage}%
\captionof{figure}{Two  side-by-side listings}
\label{fig:listings}
\end{minipage}
\begin{multicols}{2}
\lipsum[1-2]
\end{multicols}

\end{document}

In this last option, the usual restriction of multicol with floats apply.

enter image description here

Best Answer

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[Tex/LaTex] How to get a double column verbatim in a single column table, in a double column document

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