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Here is the code:

\documentclass{article}
\usepackage{booktabs}
\usepackage{longtable}
\usepackage[table]{xcolor}
\begin{document}

a

b

c

d

e

f

g


\rowcolors{2}{white}{gray!6}

\begin{longtable}{lrrrrrrrrrrr}
\caption{\label{tab:unnamed-chunk-1}My table}\\
\hiderowcolors
\toprule
  & mpg & cyl & disp & hp & drat & wt & qsec & vs & am & gear & carb\\
\midrule
\endfirsthead
\caption[]{My table \textit{(continued)}}\\
\toprule
  & mpg & cyl & disp & hp & drat & wt & qsec & vs & am & gear & carb\\
\midrule
\endhead
\showrowcolors
Mazda RX4 & 21.0 & 6 & 160.0 & 110 & 3.90 & 2.620 & 16.46 & 0 & 1 & 4 & 4\\
Mazda RX4 Wag & 21.0 & 6 & 160.0 & 110 & 3.90 & 2.875 & 17.02 & 0 & 1 & 4 & 4\\
Datsun 710 & 22.8 & 4 & 108.0 & 93 & 3.85 & 2.320 & 18.61 & 1 & 1 & 4 & 1\\
Hornet 4 Drive & 21.4 & 6 & 258.0 & 110 & 3.08 & 3.215 & 19.44 & 1 & 0 & 3 & 1\\
Hornet Sportabout & 18.7 & 8 & 360.0 & 175 & 3.15 & 3.440 & 17.02 & 0 & 0 & 3 & 2\\
\addlinespace
Valiant & 18.1 & 6 & 225.0 & 105 & 2.76 & 3.460 & 20.22 & 1 & 0 & 3 & 1\\
Duster 360 & 14.3 & 8 & 360.0 & 245 & 3.21 & 3.570 & 15.84 & 0 & 0 & 3 & 4\\
Merc 240D & 24.4 & 4 & 146.7 & 62 & 3.69 & 3.190 & 20.00 & 1 & 0 & 4 & 2\\
Merc 230 & 22.8 & 4 & 140.8 & 95 & 3.92 & 3.150 & 22.90 & 1 & 0 & 4 & 2\\
Merc 280 & 19.2 & 6 & 167.6 & 123 & 3.92 & 3.440 & 18.30 & 1 & 0 & 4 & 4\\
\addlinespace
Merc 280C & 17.8 & 6 & 167.6 & 123 & 3.92 & 3.440 & 18.90 & 1 & 0 & 4 & 4\\
Merc 450SE & 16.4 & 8 & 275.8 & 180 & 3.07 & 4.070 & 17.40 & 0 & 0 & 3 & 3\\
Merc 450SL & 17.3 & 8 & 275.8 & 180 & 3.07 & 3.730 & 17.60 & 0 & 0 & 3 & 3\\
Merc 450SLC & 15.2 & 8 & 275.8 & 180 & 3.07 & 3.780 & 18.00 & 0 & 0 & 3 & 3\\
Cadillac Fleetwood & 10.4 & 8 & 472.0 & 205 & 2.93 & 5.250 & 17.98 & 0 & 0 & 3 & 4\\
\addlinespace
Lincoln Continental & 10.4 & 8 & 460.0 & 215 & 3.00 & 5.424 & 17.82 & 0 & 0 & 3 & 4\\
Chrysler Imperial & 14.7 & 8 & 440.0 & 230 & 3.23 & 5.345 & 17.42 & 0 & 0 & 3 & 4\\
Fiat 128 & 32.4 & 4 & 78.7 & 66 & 4.08 & 2.200 & 19.47 & 1 & 1 & 4 & 1\\
Honda Civic & 30.4 & 4 & 75.7 & 52 & 4.93 & 1.615 & 18.52 & 1 & 1 & 4 & 2\\
Toyota Corolla & 33.9 & 4 & 71.1 & 65 & 4.22 & 1.835 & 19.90 & 1 & 1 & 4 & 1\\
\addlinespace
Toyota Corona & 21.5 & 4 & 120.1 & 97 & 3.70 & 2.465 & 20.01 & 1 & 0 & 3 & 1\\
Dodge Challenger & 15.5 & 8 & 318.0 & 150 & 2.76 & 3.520 & 16.87 & 0 & 0 & 3 & 2\\
AMC Javelin & 15.2 & 8 & 304.0 & 150 & 3.15 & 3.435 & 17.30 & 0 & 0 & 3 & 2\\
Camaro Z28 & 13.3 & 8 & 350.0 & 245 & 3.73 & 3.840 & 15.41 & 0 & 0 & 3 & 4\\
Pontiac Firebird & 19.2 & 8 & 400.0 & 175 & 3.08 & 3.845 & 17.05 & 0 & 0 & 3 & 2\\
\addlinespace
Fiat X1-9 & 27.3 & 4 & 79.0 & 66 & 4.08 & 1.935 & 18.90 & 1 & 1 & 4 & 1\\
Porsche 914-2 & 26.0 & 4 & 120.3 & 91 & 4.43 & 2.140 & 16.70 & 0 & 1 & 5 & 2\\
Lotus Europa & 30.4 & 4 & 95.1 & 113 & 3.77 & 1.513 & 16.90 & 1 & 1 & 5 & 2\\
Ford Pantera L & 15.8 & 8 & 351.0 & 264 & 4.22 & 3.170 & 14.50 & 0 & 1 & 5 & 4\\
Ferrari Dino & 19.7 & 6 & 145.0 & 175 & 3.62 & 2.770 & 15.50 & 0 & 1 & 5 & 6\\
\addlinespace
Maserati Bora & 15.0 & 8 & 301.0 & 335 & 3.54 & 3.570 & 14.60 & 0 & 1 & 5 & 8\\
Volvo 142E & 21.4 & 4 & 121.0 & 109 & 4.11 & 2.780 & 18.60 & 1 & 1 & 4 & 2\\
\bottomrule
\end{longtable}
\rowcolors{2}{white}{white}

\end{document}

And in the output, the second caption appears on the second page, while there's no more row to show:

enter image description here

In fact there's the line generated by \bottomrule on the second page. Can we prevent that?

(Similar but not identical issue: longtable extends unnecessarily to a second page)

  • Use it as foot (bottomrule). Then it should not be separated. – TeXnician Aug 3 '17 at 8:58
  • @TeXnician You mean using \endfoot? Could you give more details please? I don't master longtable. – Stéphane Laurent Aug 3 '17 at 9:02
  • 1
    @StéphaneLaurent - Wht TeXnician is suggesting is to (a) delete the bottomrule directive from the body of the table and (b) provide the instructions \bottomrule\endfoot immediately after \endhead. – Mico Aug 3 '17 at 9:04
  • 1
    Yeah, that's what I meant. Use \bottomrule\endfoot. And remove the last \bottomrule (keep the \\ ). – TeXnician Aug 3 '17 at 9:05
  • 1
    You can use \\*\bottomrule to prevent the pagebreak between the rule and the previous line. But in this case imho setting the rule with \endfoot is probably more logical. – Ulrike Fischer Aug 3 '17 at 11:54
1

You can utilize longtable's mechanisms. It will always keep the footer (which a bottomrule belongs to) adjacent to the row. So a solution uses the footer mechanism.

The following code should be added directly after \endhead:

\bottomrule\endfoot

Just a note (comment by Bernard): You may want to use \endlastfoot. That would only affect the very end of the table, whereas \endfoot affects also every break.

Then remove the \bottomrule from the document body, but keep \\.

  • Maybe \endlastfoot only, given the table? – Bernard Aug 3 '17 at 10:42
  • @Bernard You may be right. I'll add a note. – TeXnician Aug 3 '17 at 10:55
  • Thanks TeXnician. That doesn't work with \endlastfoot instead of \endfoot. Am I missing something ? – Stéphane Laurent Aug 3 '17 at 15:18

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