# Make no content cells in a table to be full of parallel black lines

I have a table and I want to make two cells of it full of parallel lines to show that there is no content in them. How can I do that?

A MWE is the following:

\documentclass[12pt]{article}

\usepackage{setspace}
\setlength{\parindent}{0cm}

\usepackage{xltxtra}
\usepackage{xgreek}
\setmainfont[Mapping=tex-text]{GFSDidot.otf}
\setsansfont[Mapping=tex-text]{GFSDidot.otf}

\usepackage{amsmath}

\everymath{\displaystyle}

\usepackage{booktabs}

\begin{document}

\begin{tabular}{|l|l|l|l|l|}
\hline
{} & \multicolumn{2}{|c|}{Κινητήρας} & \multicolumn{2}{|c|} {Γεννήτρια}\\
\hline
{} & Y & Δ & Υ & Δ\\
\hline
Cell 1 & $2$ & 2 & $2$ & $2$\\
\hline
Cell 2 & $25.477$ & $25.477$ & {} & {}\\
\hline
Cell 3 & $0.9823$ & $0.9765$ & {} & {}\\
\hline
\end{tabular}

\end{document}


The cells in question are the ones with the {}

Edit I: I had forgotten some words in Greek having deleted the code regarding language. I have edited it with these lines of code.

-
are you missing inputenc? Or do you assume xelatex or ?? –  David Carlisle May 1 at 12:16
–  Henri Menke May 1 at 12:17
I use xelatex sorry. –  Adam May 1 at 12:17
@HenriMenke I want a lot of parallel black lines to mean no content not to cross out the cell. –  Adam May 1 at 12:18
@Mico that is the code I use and compile. –  Adam May 1 at 12:28

\documentclass[12pt]{article}

%% \usepackage[utf8]{inputenc}
\usepackage{setspace}
\setlength{\parindent}{0cm}
\usepackage{amsmath}

\everymath{\displaystyle}

\usepackage{booktabs}

\begin{document}

\begin{tabular}{|l|l|l|l|l|}
\hline
{} & \multicolumn{2}{|c|}{Κινητήρας} & \multicolumn{2}{|c|} {Γεννήτρια}\\
\hline
{} & Y & Δ & Υ & Δ\\
\hline
Cell 1 & $2$ & 2 & $2$ & $2$\\
\hline
Cell 2 & $25.477$ & $25.477$ & \zz & \zz\\
\hline
Cell 3 & $0.9823$ & $0.9765$ & \zz & \zz\\
\hline
\end{tabular}

\end{document}


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A standard technique for indicating that a table cell is either empty or can't have meaningful content is to gray it out, i.e., to fill it in completely with a shade of gray. To do so in XeLaTeX, you could load the colortbl and xcolor packages and apply the instruction \cellcolor{gray} in the cells in question. If "gray" isn't dark enough, you could employ "darkgray", say.

% !TEX TS-program = xelatex
\documentclass[12pt]{article}
\usepackage{setspace}
\setlength{\parindent}{0cm}
\usepackage{fontspec}
\usepackage{xgreek}
\setmainfont[Mapping=tex-text]{GFSDidot.otf}
\setsansfont[Mapping=tex-text]{GFSDidot.otf}
\usepackage{amsmath}
\everymath{\displaystyle}
\usepackage{booktabs}

\usepackage[table]{xcolor} % load colortbl and xcolor packages
\begin{document}
\begin{tabular}{|l|l|l|l|l|}
\hline
\cellcolor{gray} & \multicolumn{2}{c|}{Κινητήρας} & \multicolumn{2}{c|} {Γεννήτρια}\\
\hline
\cellcolor{gray} & Y & Δ & Υ & Δ\\
\hline
Cell 1 & $2$ & 2 & $2$ & $2$\\
\hline
Cell 2 & $25.477$ & $25.477$ & \cellcolor{gray} & \cellcolor{gray}\\
\hline
Cell 3 & $0.9823$ & $0.9765$ & \cellcolor{gray} & \cellcolor{gray}\\
\hline
\end{tabular}
\end{document}

-

Here is my first take. It's not ideal because the length of the lines is hard coded as 4em at the moment and I would prefer to have this done automatically. Mabybe some TeXpert can improve on this. Otherwise it's quite simple.

\documentclass[12pt]{article}

\usepackage{booktabs}

\begin{document}

\def\l{\hbox{\vrule width 4em height 0.4pt}\kern1.8pt}
\def\x{\vbox{\kern4pt\l\l\l\l\l}}

\begin{tabular}{|l|l|l|l|l|}
\hline
{} & \multicolumn{2}{|c|}{One} & \multicolumn{2}{|c|} {Two}\\
\hline
{} & Y & $\Delta$ & Υ & $\Delta$ \\
\hline
Cell 1 & $2$ & 2 & $2$ & $2$\\
\hline
Cell 2 & $25.477$ & $25.477$ & \x & \x\\
\hline
Cell 3 & $0.9823$ & $0.9765$ & \x & \x\\
\hline
\end{tabular}

\end{document}


-