Weird Spacing of Square Brackets and added .00s in Table with siunitx

alignmentsiunitxtables

I use the siunitx package to align numbers in a table column at their "dot". This used to work fine. When I re-compile an old TeX file, square brackets around the numbers are suddenly weirdly spaced and numbers in the column titles (I use numbers to label the columns) are transformed from (1) to (1.00).

Below I show the current result of siunitx with the weird spacing of brackets and the artificially added .00s. I also show a table which does not use siunitx and looks normal (but does not align numbers in a column at their dot).

Question: Was there an update to siunitx that changed how it works? How can avoid the odd spacing of square brackets and the adding of zeros in the column titles while aligning numbers at their dot?

\documentclass{article}

\usepackage{booktabs}
\usepackage{siunitx}
\sisetup{output-exponent-marker = \text{e}, 
         exponent-product={}, 
         retain-explicit-plus, 
         input-open-uncertainty  = , 
         input-close-uncertainty = , 
         table-align-text-pre    = false,
         table-align-text-post = false, 
         round-mode=places, 
         round-precision=2, 
         table-space-text-pre = (, table-space-text-post   = )}

\begin{document}

\begin{table}
\begin{tabular}{l S @{} S @{} S @{} S @{} S @{} S @{} S @{} S @{} S} 
& (1) & (2) & (3) & (3)--(1) & & (4) & (5) & (6) & (6)--(4) \\ \midrule
Row 1 & 0.96  & 0.60  & 0.45  & -0.50 &       & 0.69  & 0.84  & 0.64  & -0.05 \\ \midrule
Row 2 & [3.93] & [2.75] & [1.93] & [-3.64] &       & [3.47] & [4.68] & [3.10] & [-0.59]
\end{tabular}
\end{table}


\begin{table}
\begin{tabular}{llllllllll}
& (1) & (2) & (3) & (3)--(1) & & (4) & (5) & (6) & (6)--(4) \\ \midrule
Row 1 & 0.96  & 0.60  & 0.45  & -0.50 &       & 0.69  & 0.84  & 0.64  & -0.05 \\ \midrule
Row 2 & [3.93] & [2.75] & [1.93] & [-3.64] &       & [3.47] & [4.68] & [3.10] & [-0.59]
\end{tabular}
\end{table}

\end{document}

Best Answer

Short answer: yes there have been many recent changes to siunitx. In this case, to avoid the decimalization of the top row, enclose the cell contents in braces.

\documentclass{article}

\usepackage{booktabs}
\usepackage{siunitx}
\sisetup{output-exponent-marker = \text{e}, 
         exponent-product={}, 
         retain-explicit-plus, 
         input-open-uncertainty  = , 
         input-close-uncertainty = , 
         table-align-text-pre    = false,
         table-align-text-post = false, 
         round-mode=places, 
         round-precision=2, 
         table-space-text-pre = (, table-space-text-post   = )}

\begin{document}

\begin{table}
\begin{tabular}{l S @{} S @{} S @{} S @{} S @{} S @{} S @{} S @{} S} 
& {(1)} & {(2)} & {(3)} & {(3)--(1)} & & {(4)} & {(5)} & {(6)} & {(6)--(4)} \\ \midrule
Row 1 & 0.96  & 0.60  & 0.45  & -0.50 &       & 0.69  & 0.84  & 0.64  & -0.05 \\ \midrule
Row 2 & [3.93] & [2.75] & [1.93] & [-3.64] &       & [3.47] & [4.68] & [3.10] & [-0.59]
\end{tabular}
\end{table}


\begin{table}
\begin{tabular}{llllllllll}
& (1) & (2) & (3) & (3)--(1) & & (4) & (5) & (6) & (6)--(4) \\ \midrule
Row 1 & 0.96  & 0.60  & 0.45  & -0.50 &       & 0.69  & 0.84  & 0.64  & -0.05 \\ \midrule
Row 2 & [3.93] & [2.75] & [1.93] & [-3.64] &       & [3.47] & [4.68] & [3.10] & [-0.59]
\end{tabular}
\end{table}

\end{document}

To specify the format of the brackets, use table-format option to S. Of course, if there are multiple rows in play, you only get one S[table-format...] per column.

\documentclass{article}

\usepackage{booktabs}
\usepackage{siunitx}
\sisetup{output-exponent-marker = \text{e}, 
         exponent-product={}, 
         retain-explicit-plus, 
         input-open-uncertainty  = , 
         input-close-uncertainty = , 
         table-align-text-pre    = false,
         table-align-text-post = false, 
         round-mode=places, 
         round-precision=2, 
         table-space-text-pre = (, table-space-text-post   = )}

\begin{document}

\begin{table}
\begin{tabular}{l S[table-format=2.2] @{} S[table-format=2.2] @{} 
  S[table-format=2.2] @{} S[table-format=3.2] @{} S[table-format=2.2] @{} 
  S[table-format=2.2] @{} S[table-format=2.2] @{} S[table-format=2.2] @{} 
  S[table-format=3.2]} 
& {(1)} & {(2)} & {(3)} & {(3)--(1)} & & {(4)} & {(5)} & {(6)} & {(6)--(4)} \\ \midrule
Row 1 & 0.96  & 0.60  & 0.45  & -0.50 &       & 0.69  & 0.84  & 0.64  & -0.05 \\ \midrule
Row 2 & [3.93] & [2.75] & [1.93] & [-3.64] &       & [3.47] & [4.68] & [3.10] & [-0.59]
\end{tabular}
\end{table}


\begin{table}
\begin{tabular}{llllllllll}
& (1) & (2) & (3) & (3)--(1) & & (4) & (5) & (6) & (6)--(4) \\ \midrule
Row 1 & 0.96  & 0.60  & 0.45  & -0.50 &       & 0.69  & 0.84  & 0.64  & -0.05 \\ \midrule
Row 2 & [3.93] & [2.75] & [1.93] & [-3.64] &       & [3.47] & [4.68] & [3.10] & [-0.59]
\end{tabular}
\end{table}

\end{document}

Related Solutions

[Tex/LaTex] Unit column in table with square brackets and siunitx

This can be done with the help of the collcell package (loads array).

Just define your column as

\newcolumntype{U}{>{$[\collectcell\si} l <{\endcollectcell]$}}

and you're done.

MWE

\documentclass[10pt,a4paper]{report}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{siunitx}
\usepackage{collcell} % loads array
    \newcolumntype{M}{>{$} l <{$}}
    \newcolumntype{U}{>{$[\collectcell\si} l <{\endcollectcell]$}}

\begin{document}

\begin{equation}
R = \sqrt{Q\: \frac{t}{\pi\: b\: n_{eff}}}
\end{equation}

Where:\bigskip

\begin{tabular}{M |l U}
    R & Radius for BNBO & \meter\\
    Q & Extraction rate & \cubic\meter\per\second\\
    t & Time frame for BNBO & \second\\
    b & Aquifer thickness & \meter\\
    n_{\textit{eff}} & Effective porosity & -\\
\end{tabular}
\end{document}

Output

enter image description here

Notice that the right way to add some spacing is not \\ but something like \bigskip. Also, usign align when there is nothing to align is not the best choice, use equation instead.

If you really want, but I would avoid it, you can even add \left and \right

\newcolumntype{U}{>{$\left[\collectcell\si} l <{\endcollectcell\right]$}}

Siunitx in table: unexpected spacing

I recommend explicitly marking up where you want tokens to be treated as \mathord: output-decimal-marker = \mathord{:}. This will work in both v2 and v3, and has the advantage that it retains the semantic information which using simply {...} does not. That is useful for example when switching to text mode, where {...} has no special meaning and where appropriate replacement of \mathord by a text mode equivalent can be used to retain important information.

The reason you see a change is rather technical, and will only show in tabular alignment. In v2, table cells were constructed by formatting each part of the number separately. This was rather slow and meant that there was a need to do this separately from 'normal' numbers, leading to some edge case bugs. For v3, I have picked up an idea from pgfplotstable: format using a marker between each part for alignment. For a normal number, the marker is empty and nothing is different. For an alignment, the marker is used to split out the various parts of the number, meaning alignment is faster and not using a different formatting path.

The issue arises as TeX removes braces if we match the entirety of a delimited argument in one go:

\def\foo#1X#2X#3\stop{\showtokens{#2}}
\foo stuffX{content}X\stop
\foo stuffX{content} X\stop

That means that a single extra set of braces around an entire numerical part will be dropped: usually not an issue but a problem if you are using {X} not \mathord{X} to make a symbol mathord. I could change the table setup to avoid this, but then I'd be back to a slower setup (there are lots of parts of a number I'd have to cover).

If you don't want to use \mathord, you can use an additional set of braces, which will deal with the issue. Or you could say add some space inside braces, which would be ignored in math mode but which would also prevent brace stripping.

Best Answer

Related Solutions

[Tex/LaTex] Unit column in table with square brackets and siunitx

Siunitx in table: unexpected spacing

Related Question