长表单元格宽度问题

Question

编辑： 我玩了一下你的表格。首先，我添加了包makecell-- 从中我使用宏\multirowcell和thead-- 和包siunitx来更好地形成第 13 列。thead我用替换定义的命令specilacell

然后，我为了更简洁的书写定义了三个新命令：\mc作为的简写\multicolumn，mrc作为的简写并将multirowcell单元格内容居中以及mrcR作为的简写multirowcell并将单元格内容右对齐。

除此之外，我还删除了表格中的垂直线，并将其缩小tabcolsep到4.5pt，将使用的字体从更改为footnotesize。\small我将第一行和第二行之间的水平线替换为一系列\cmidrule。

最后我清理了你的代码。得到的结果是：

在 MWE 中，我还转义了第二个表头和表尾的定义。应该很容易添加，就像定义第一个表头一样。

\documentclass[journal]{IEEEtran}
    \usepackage{array,booktabs,longtable,makecell,multirow}
\newcommand\mc[2]{\multicolumn{#1}{c}{#2}}
\newcommand\mrcR[2]{\multirowcell{#1}[0pt][r]{#2}}
\newcommand\mrc[2]{\multirowcell{#1}[0pt][c]{#2}}
    \usepackage{siunitx}

    \usepackage{lipsum}
%    \usepackage{showframe}

\begin{document}
    {\onecolumn
     \small
     \setlength{\tabcolsep}{4.5pt}
\begin{longtable}{c cr c crrcc cc rSc c}
    \caption{Summary of stuff.}
    \label{tab:big_table_over_margins}\\
    \toprule
\thead{Work}    &   \mc{2}{Parallelism} &   \mc{1}{Data}
    &   \mc{5}{LDPC Code}   &   \mc{2}{Decoding}
        &   \mc{3}{Perf.}   &   \mc{1}{Platform}    \\
    \cmidrule(r){1-1}\cmidrule(lr){2-3}\cmidrule(lr){4-4}
        \cmidrule(lr){5-9}\cmidrule(lr){10-11}\cmidrule(lr){12-14}
            \cmidrule(l){15-15}
    &   \mc{1}{Thread}  &   \mc{1}{Data}    &   \mc{1}{Width}
        &   \mc{1}{Code}    &   \mc{1}{q}   &   \mc{1}{N}   &   \mc{1}{Rate}
            &   \mc{1}{Tanner}  &   \mc{1}{Sched.}  &   \mc{1}{Alg.}
                &   \thead{Lat.\\(ms)}  &   {\thead{Thr.\\(Mbit/s)}}
                    &   \mc{1}{Iter.}   &   \mc{1}{Name}  \\
    \midrule
%
\mrc{5}{Work 1} & \mrc{5}{bpc} & \mrcR{3}{512} & \mrc{5}{6--8} & \mrc{5}{802.16e} & \mrcR{5}{2} & 768 & \mrc{5}{1/2} & \mrc{5}{Struct.} & \mrc{5}{TDMP} & \mrc{5}{MSA} & 2.62 & 150 & \mrc{5}{10} & \mrc{5}{GeForce\\9800 GTX+}
        \\
 &  &     &  &  &  & 1152 &  &  &  &  & 3.88  & 152 &  & \\
 &  &     &  &  &  & 1536 &  &  &  &  & 4.91  & 160 &  & \\
 &  & 384 &  &  &  & 1920 &  &  &  &  & 5.27  & 140 &  & \\
 &  & 256 &  &  &  & 2304 &  &  &  &  & 3.69  & 160 &  & \\
Work 2 & {cpc} & 128 & 8 & 802.16e & 2 & 2304 & 1/2 & Struct. & TDMP & MSA & 1.09 & 270 & 10 & \thead{Cell\\B.E.}
        \\
    \midrule
 \mrc{4}{Work 3} & \mrc{4}{tpn} & \mrcR{4}{1} & \mrc{4}{8} & \mrc{4}{802.16e}
    &  & 768 & \mrc{4}{xxx} & \mrc{4}{Struct.} & \mrc{4}{TPMP} & \mrc{4}{MSA}
        & 0.01 & 98.7 & \mrc{4}{10} & \mrc{4}{Nallatech\\PCI 385N D5} \\
  &  &  &  &  &  & 1152 &  &  &  &  & 0.01 & 103.9 &  & \\
  &  &  &  &  &  & 1536 &  &  &  &  & 0.02 & 81.4  &  & \\
  &  &  &  &  &  & 1920 &  &  &  &  & 0.02 & 81.0  &  & \\
 \mrc{4}{Work 4} & \mrc{4}{bpe}  & \mrcR{4}{4} & \mrc{4}{32} & \mrc{4}{Regular} & 32 & \mrc{4}{384} & \mrc{4}{1/3} & \mrc{4}{Sparse} & \mrc{4}{TPMP} & \mrc{4}{FFT-\\-SPA} & 14.93 & 0.82 & \mrc{4}{10} & \mrc{4}{Tesla\\C1060}
        \\
  &  &  &  &  & 64  &  &  &  &  &  & 31.55 & 0.39 &  & \\
  &  &  &  &  & 128 &  &  &  &  &  & 7.36  & 1.67 &  & \\
  &  &  &  &  & 256 &  &  &  &  &  & 10.28 & 1.20 &  & \\
    \midrule
 \mrc{6}{Work 5} & \mrc{2}{tpn} & \mrcR{6}{1} & \mrc{6}{8} & \mrc{2}{802.11n} & \mrcR{6}{2} & \mrc{2}{1944} & \mrc{2}{1/2} & \mrc{2}{Struct.} & \mrc{2}{TPMP} & \mrc{2}{MSA} & 0.12 & 16 & \mrc{6}{10} & \mrc{2}{Nallatech\\PCI 385N D5}
        \\
  &  &  &  &  &  &  &  &  &  &  & 0.09 & 21 &  & \\
  & \mrc{4}{N/A} &  &  & \mrc{4}{DVB-S2} &  & \mrc{4}{64800} & \mrc{4}{1/2} & \mrc{4}{Struct.} & \mrc{4}{TPMP\\TDMP} & \mrc{4}{MSA} & 0.28 & 234 &  & \mrc{2}{Virtex5 LX330T\\Max2 Board}
        \\
  &  &  &  &  &  &  &  &  &  &  & 0.05 & 1260 &  &
        \\
  &  &  &  &  &  &  &  &  &  &  & 0.28 & 234 &  & \mrc{2}{Virtex6 LX330T\\Max3 Boar}
        \\
  &  &  &  &  &  &  &  &  &  &  & 0.05 & 1296 &  & \\
 \bottomrule
\end{longtable}
\lipsum[1]
    \end{document}

类似地，您可以改进其他表格。最后，使用包showframe您可以查看表格是否适合文本宽度。

Answer 1