This question is redundant but I really don't know how to fix my code! In my following code, I want to span the table over the two-column paper format. However, the table moves to the next page!! How can I stop that and make it at the top of the same page?




\caption{Results} \label{xor-table}

\multirow{3}{*}{\textbf{Approach}}& \multirow{2}{*}{\textbf{\parbox[c]{2mm}{\multirow{2}{*}{\rotatebox[origin=c]{90}{Metric}}}}} & \multicolumn{4}{c|}{\textbf{XOR Gate}}\\ \cline{3-6} 
&& \multicolumn{2}{c|}{\textbf{\begin{tabular}[c]{@{}c@{}}Positive \end{tabular}}} & \multicolumn{2}{c|}{\textbf{\begin{tabular}[c]{@{}c@{}}Negative\end{tabular}}} \\ \cline{3-6} 
&& \textbf{K=512}& \textbf{K=1024}& \textbf{K=512}& \textbf{K=1024}\\  \Xhline{2\arrayrulewidth}

\multirow{4}{*}{\textbf{\begin{tabular}[c]{@{}c@{}}Method\\ A \end{tabular}}}
&$k$\tnote{\textasteriskcentered} &512&1024&512&1024 \\ \cline{2-6} 
& \emph{S} &&&& \\ \cline{2-6} 
& $T$(s) &&& &\\ \Xhline{2\arrayrulewidth}

\multirow{4}{*}{\textbf{\begin{tabular}[c]{@{}c@{}}Method\\ B \end{tabular}}} 
&$k$\tnote{\textasteriskcentered} &512 &1024&512&1024\\ \cline{2-6} 
& \emph{S}  &&&& \\ \cline{2-6} 
& $T$(s) & &&& \\ \hline

    \item[\textasteriskcentered] The number of partitions 

  • 1
    if something is already set on a two-column page, it is impossible to set a full-width float at the top of the page. the input for the float should be positioned before the start of the page on which it is to appear. – barbara beeton Aug 21 '17 at 15:50

Package placeins has macro \FloatBarrier to prevent floats from moving too far.

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