Rounding integers in table with siunitx

Question

My problem is to round numbers that are integers so, for example, I have 123456789 but I only want to have 123 * 10^6 in the table cell.

example code:

\begin{table}
\caption{Table} \label{tab:tab}
\begin{center}
\begin{tabular}{l S}
\hline
 Name & {number} \\
\hline
 a & 18799382 \\
 b & 16492855 \\
\hline
\end{tabular}
\end{center}
\end{table}

I want to round the second column to have an output of something like:

\begin{table}
\caption{Table} \label{tab:tab}
\begin{center}
\begin{tabular}{l S}
\hline
 Name & {number} \\
\hline
 a & 188e5 \\
 b & 165e5 \\
\hline
\end{tabular}
\end{center}
\end{table}

Welcome to TeX.SX! Is Converting numbers to scientific notations helpful or are you looking for an automatic solution? — Bobyandbob, Jun 01 '18 at 11:53
Actually, that is useful, I just didn't know that the same controls work for tabular, but now it is obvious as I see the solution of @JosephWright. — mani, Jun 02 '18 at 10:37

score 7 · Accepted Answer · answered Jun 01 '18 at 11:46

You need to do two things:

Turn on rounding with appropriate settings
Turn on fixed exponents with appropriate settings

Thus something like

\begin{tabular}
{
  l
  S[round-mode = figures,
   round-precision = 3,
   scientific-notation = fixed,
   fixed-exponent = 5]
}

Rounding integers in table with siunitx

1 Answers1