Is it possible to vertically center multiple columns in a table?

Question

I've found an example here but that only centers one column and I can't really adapt it to my needs. What I'd like is something like this:

Answer 1

You'll need \usepackage{array} to do this.

From what I can gather, you're looking at the m{} alignment, which wraps a paragraph at the specified point value, and vertically aligns the text to the middle of the field. For example, something like this:

\begin{tabular}{|m{2cm}|m{1ex}|m{1ex}|m{1ex}} \hline
           & x1 & x2 & x3 \\\hline
Long Label & 1  & 0  & 1  \\\hline
Long Label & 0  & 1  & 1  \\\hline
\end{tabular}