I tried this code but the border lines are not deleted:
\begin{tabular}{|p{0.6in}|p{0.3in}|p{0.9in}|p{0.9in}|p{0.8in}|} \hline
& & & $P_{mot}$ & \\ \hline
$P_{batt}$ & & S & M & H \\ \hline
& S & S & Z & VS \\ \hline
SOC & M & M & Z & H \\ \hline
& H & M & Z & H \\ \hline
\end{tabular}
How do I delete the border of cells?
With \multirow and \multicolumn you can reach what you need.
I have also created a new column type for centering the cell contents and redefined \arraystretch to have more vertical space between rows.
However, I would suggest you to get rid of the vertical rules and use booktabs.
\documentclass{article}
\usepackage{array}
\newcolumntype{C}[1]{>{\centering\arraybackslash}p{#1}}
\renewcommand{\arraystretch}{1.3}
\usepackage{multirow}
\usepackage{booktabs}
\begin{document}
Your table:\vspace{10pt}
\begin{tabular}{|p{0.6in}|C{0.3in}|C{0.4in}|C{0.4in}|C{0.4in}|} \hline
\multicolumn{2}{|c|}{\multirow{2}{*}{$P_{batt}$}}& \multicolumn{3}{c|}{$P_{mot}$} \\ \cline{3-5}
\multicolumn{2}{|c|}{} & S & M & H \\ \hline
& S & S & Z & VS \\ \cline{2-5}
SOC & M & M & Z & H \\ \cline{2-5}
& H & M & Z & H \\ \hline
\end{tabular}
\vspace{10pt}My suggestion:\vspace{10pt}
\begin{tabular}{lc*{3}{C{1.5em}}}
\toprule
\multicolumn{2}{c}{\multirow{2}{*}{$P_{batt}$}}& \multicolumn{3}{c}{$P_{mot}$} \\ \cmidrule{3-5}
\multicolumn{2}{c}{} & S & M & H \\ \midrule
& S & S & Z & VS \\ \cmidrule(l){2-5}
SOC & M & M & Z & H \\ \cmidrule(l){2-5}
& H & M & Z & H \\
\bottomrule
\end{tabular}
\end{document}
Welcome to TeX.SE! In order to merge rows or columns, you need to use \multirow (which requires the multirow package) or \multicolumn, respectively. And if you nest them, you need to do it in the right order.
\documentclass{article}
\usepackage{multirow}
\begin{document}
\begin{tabular}{|p{0.6in}|p{0.3in}|p{0.9in}|p{0.9in}|p{0.8in}|} \hline
\multicolumn{2}{|c|}{\multirow{2}{*}{$P_\mathrm{batt}$}} &
\multicolumn{3}{|c|}{$P_\mathrm{mot}$ } \\ \cline{3-5}
\multicolumn{2}{|c|}{} & S & M & H \\ \cline{1-5}
\multirow{3}{*}{SOC} & S & S & Z & VS \\ \cline{2-5}
& M & M & Z & H \\ \cline{2-5}
& H & M & Z & H \\ \hline
\end{tabular}
\end{document}
| in \multicolumn{3}{|c|}{$P_\mathrm{mot}$ } should be deleted, otherwise it is printed twice.
– CarLaTeX
Nov 20 '18 at 06:47
Whatever applies to each item in a column should go in the column header. Here's my proposal:
\documentclass[twocolumn]{article}
\usepackage{array,booktabs}
\usepackage{lipsum} % for context
\begin{document}
\lipsum[2]
\begin{table}[htp]
\centering
\begin{tabular}{ @{} *{4}{w{c}{3em}} @{} }
\toprule
$P_{\mathrm{batt}}$ & \multicolumn{3}{c}{$P_{\mathrm{mot}}$} \\
\cmidrule(r){1-1} \cmidrule(l){2-4}
SOC & S & M & H \\
\midrule
S & S & Z & VS \\
M & M & Z & H \\
H & M & Z & H \\
\bottomrule
\end{tabular}
\caption{Rule based of fuzzy logic control}
\end{table}
\lipsum
\end{document}
booktabs. Something like this? – Werner Nov 20 '18 at 06:17\documentclass{...}, the required\usepackage's,\begin{document}, and\end{document}. That may seem tedious to you, but think of the extra work it represents for TeX.SX users willing to give you a hand. Help them help you: remove that one hurdle between you and a solution to your problem. – Martin Schröder Nov 20 '18 at 12:34