I'm trying to create entry similar to tables using array
begin{array}{*{20}{r}}
{}| & A |& B \\
\hline
A_1| & {one|} & {two} \\
B_2| & {three|} & {four} \\
\hline
\end{array}
Is there any way to draw continuous vertical lines? (something like hline for drawing horizontal lines?)
Certainly:
\documentclass{article}
\begin{document}
\[
%\begin{array}{*{20}{r}}
\begin{array}{|*{3}{r|}} % because later only 3 columns
% {}| & A |& B \\
{} & A & B \\
\hline
% A_1| & {one|} & {two} \\
A_1& {one} & {two} \\
% B_2| & {three|} & {four} \\
B_2 & {three} & {four} \\
\hline
\end{array}
\]
\end{document}
Every vertical line in the description of columns (r|'s here) produces a vertical line through the whole array. I understand that your one to four words are only artificial ones.
|into column argument, saybegin{array}{|*{20}{r|}}, and you will get what you want.