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I'm trying to get images in my document in two different ways:

  1. On top of the entire page, centered
  2. On top of a single column

I tried it with both twocols and multicols. I ruled out twocols because it forces a new page every time you turn it on, because I need the abstract to be wide and the rest of the cover page to be two columns.

Here are some examples of both points (screenshot from a downloaded PDF): screenshot from a downloaded PDF

I want to achieve both, but somehow I can only solve the first point with:

\end{multicols}

\begin{figure}
  \centering
    \includegraphics[width=0.5\textwidth]{figure}
  \caption{Dataflow pipeline of the edge detector}
  \label{fig:workflowedge}
\end{figure}

\begin{multicols}{2}

Is it awkward to turn off multicols, then turn it back on again?

For my second point, I've tried everything, but almost always, the image doesn't show up at all! The only way I can get it to show at all is by specifying the H placement specifier, but that places the image inside the text where I defined it, not on top of the column.

This is my best try, but it hides the image and breaks all references to ??:

\begin{figure}[t!]
  \centering
    \includegraphics[width=0.25\textwidth]{figure}
  \caption{Dataflow pipeline of the edge detector}
  \label{fig:workflowedge}
\end{figure}

and I'm getting the warning:

Package multicol Warning: Floats and marginpars not allowed inside `multicols' environment!.

How can I make a figure a non-float?

I also tried the figure* environment, but that just creates an image centered on top of the page, like my first point.

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1  
Welcome to TeX.SX! Nice question, but I believe that the solution is just to stick to top or bottom page wide insertions: placing them in the middle would confuse your reader about what's the correct reading order. –  egreg May 29 '12 at 10:23
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4 Answers 4

The multicol environment is not designed to support column floats. The concept of balancing makes this next to impossible to automatically provide correct results in the general case and therefore I decided not to extend multicolin this direction for 2e.

For example, with multicol you can change the number of columns mid-page, how should that reflect on float placements, given that TeX can't re-break prargraphs so that they flow around floats that then not fit the column width any longer.

For the less general case, e.g., fixed 2-column layout with only a little bit of balancing, one could probably extend multicol to support this, but it would then break in the more generic cases, and as I said it isn't there.

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

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I'm a noob at latex so I don't even dare go anywhere near extending anything (what do you mean by 2e anyway?). I don't need general cases, but just 2 columns, starting in the middle of my title page (which rules out \twocolumn) –  Mark Jeronimus May 29 '12 at 14:46
    
2e is the current version of LaTeX (called LaTeX2e). I wasn't really suggesting you can extend it, It is rather close to impossible in the boundaries of the current LATeX release, so I what I was trying to say is really, LaTeX doesn't have a solution for you if you want both banacing and those floats automatically. –  Frank Mittelbach May 29 '12 at 15:02
    
How about, is there a way to specify that the figure should be on a specific page on a specific location? (in one of either column, but relative to the page rather than to text) That wouldn't mess with the flowing (of text), and if my figure ever becomes too far separated from the relevant text, I'll just move the figure to another spot. Is that possible? –  Mark Jeronimus May 30 '12 at 5:42
    
I was thinking about this too and spent this evening to provide a simple proto-type solution for this. Will update the answer to include this. –  Frank Mittelbach May 30 '12 at 19:30
    
Thanks, but today I found out that MiKTeX comes with IEEE Transactions template documents, which do exactly what I want, by way of using simple twocolumn document style, but placing the abstract in the title portion using a specialized command. –  Mark Jeronimus Jun 7 '12 at 8:33
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I recommend you use the twocolumn document class option instead of the multicol package. With the twocolumn option set, you can use figure and table environments to span a single column of text, and figure* and table* environment for floats to span both columns. With the starred environments, do note that you're restricted to placing floats at the top of the page (or at the very end).

In addition, as others have pointed out already, whenever a document is typeset in a two-columns-per-page format, it's best to only ever place floats at the top of a page; hence, use the [t] specifier for single-column floats.

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I tried, but the problem with \twocolumn is that it starts a new page, and the title page, including abstract, a single column, from there on two columns. (that PDF is too) –  Mark Jeronimus May 29 '12 at 14:42
    
the \twocolumn command has an optional argument where you can put your "title" stuff, see this question: tex.stackexchange.com/questions/57584/… –  tohecz May 30 '12 at 11:50
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Here is my code. it works for IEEE journal template (two columns journal template, bare_jrnl_compsoc, bare_jrnl, and so on). So one page-wide figure is in two columns setting paper.

\begin{figure*}

 \center

  \includegraphics[width=\textwidth]{AAA.eps}

  \caption{PRF and pulses number comparison with eigenwaveform.}

  \label{AAA}

\end{figure*}

Hope it works for you.

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up vote 0 down vote accepted

I solved my question myself.

I found an IEEE Transactions template from the IEEE society that has supports 2 columns with balancing, column figures and wide figures (the screenshot in the question is also an IEEE Transactions paper).

The Transactions templates can be found inside stock MiKTeX (for windows), or otherwise on this page.

I used the template called bare_jrnl_compsoc (computer society journal) as that's the only one allowing a wide abstract, and changed the document type back to journal (as in the bare_adv template)

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6  
What exactly do you mean by "balancing"? The IEEE templates do not do any text balancing whatsoever. If you mean that the columns align at the bottom, this is not traditionally called balancing but in the TeX world but in the TeX world this is called \flushbottom. Balancing would be when at the and of the document (or in the middle if explicitly requested) two columns are made equally high and leave the same amount of white space at the bottom. –  Frank Mittelbach Jul 1 '12 at 11:09
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