Vertical spacing of a table cell

I want to tabulate formulas, but I find that the lines of the table cells are too close together, and this is aesthetically unsatisfactory. Example (formulae copied from wikipedia):

\begin{tabular}{|c|c|}
\hline
Cylindrical & $\displaystyle{{1 \over \rho}{\partial \over \partial\rho}\left(\rho {\partial f \over \partial \rho}\right) + {1 \over \rho^2}{\partial^2 f \over \partial \phi^2} + {\partial^2 f \over \partial z^2}}$\\\hline
Spherical & $\displaystyle{{1 \over r^2}{\partial \over \partial r}\!\left(r^2 {\partial f \over \partial r}\right) \!+\!{1 \over r^2\!\sin\theta}{\partial \over \partial \theta}\!\left(\sin\theta {\partial f \over \partial \theta}\right) \!+\!{1 \over r^2\!\sin^2\theta}{\partial^2 f \over \partial \phi^2}}$\\\hline
\end{tabular}


gives this

and you see that the top of the formulas are chopped by the lines. Suggestions?

• See Column padding in tables on ways of adjusting both vertical and horizontal padding of cell entries in tabular or array. Apr 1 '12 at 14:18
• @Werner Since this is an answer, you should pose it as such. Jul 4 '14 at 15:17

I have solved this in the past by modifying the value of \arraystretch

{\renewcommand{\arraystretch}{1.2} %<- modify value to suit your needs
\begin{tabular}{|c|c|}
...
\end{tabular}
}


Edit:

Actually having researched this a bit more it seems that having equations in the cells has unexpected behaviour, where the space is increase disproportionally at the top (value set to 3 to start getting the space at the bottom):

more recently I have started to use the tabu package to replace all tables (from tabular to tabularx to longtable). It also provide a few more controls. in this case the \tabulinesep has a much more appropirate effect on the results:

\documentclass[preview]{standalone}
\usepackage{tabu}
\begin{document}
{\tabulinesep=1.2mm
\begin{tabu} {|c|c|}
\hline
Cylindrical & $\displaystyle{{1 \over \rho}{\partial \over \partial\rho}\left(\rho {\partial f \over \partial \rho}\right) + {1 \over \rho^2}{\partial^2 f \over \partial \phi^2} + {\partial^2 f \over \partial z^2}}$\\\hline
Spherical & $\displaystyle{{1 \over r^2}{\partial \over \partial r}\!\left(r^2 {\partial f \over \partial r}\right) \!+\!{1 \over r^2\!\sin\theta}{\partial \over \partial \theta}\!\left(\sin\theta {\partial f \over \partial \theta}\right) \!+\!{1 \over r^2\!\sin^2\theta}{\partial^2 f \over \partial \phi^2}}$\\\hline
\end{tabu}}
\end{document}


which produces the following result:

• Good advice! tabu is a really good package! Feb 26 '13 at 21:09

You may use a different table format, leaving out the vertical lines which are by no means necessary; you can also greatly simplify the input with a personal command for partial derivatives:

\documentclass{article}

\usepackage{booktabs,amsmath}

\newcommand{\dpder}[3][]{\dfrac{\partial^{#1}#2}{\partial #3}}

\begin{document}
\begin{tabular}{lc}
\toprule
Cartesian &
$\dpder[2]{f}{x^2}+\dpder[2]{f}{y^2}+\dpder[2]{f}{z^2}$
\\
\midrule
Cylindrical &
$\dfrac{1}{\rho} \dpder{}{\rho}{\left(\rho \dpder{f}{\rho}\right)} + \dfrac{1}{\rho^2} \dpder[2]{f}{\phi^2} + \dpder[2]{f}{z^2}$
\\
\midrule
Spherical &
$\dfrac{1}{r^2}\dpder{}{r}{\left(r^2 \dpder{f}{r}\right)} +\dfrac{1}{r^2\sin\theta}\dpder{}{\theta}{\left(\sin\theta \dpder{f}{\theta}\right)} +\dfrac{1}{r^2\sin^2\theta}\dpder[2]{f}{\phi^2}$
\\
\bottomrule
\end{tabular}
\end{document}


Notice how to avoid unwanted spaces in the "cylindrical" and "spherical" rows by using {\left(...\right)} (a couple of braces is sufficient instead of explicit backing up). Note also the usage of \dfrac in the definition of \dpder that avoids specifying \displaystyle (which is however not a command taking arguments, but a declaration).

With booktabs there's rarely the need to adjust the row spacing.

• Thanks. I usually use macros but in this case I compiled a list of useful formulas for my students, and just copy-pasted it from wikipedia. Can you explain what the second (empty) square braces do in the definition of \dpder? Apr 1 '12 at 20:22
• @yohbs With \newcommand{\dpder}[3][]{...} we say that the command has one optional argument and two mandatory ones; the default of the optional argument is empty (the exponent for the \partial in the numerator. Apr 1 '12 at 20:43
• I didn't knew about the spacingissue. Really nice, egreg! :) Nov 30 '13 at 15:36
• Can booktabs be used together with tabularx in order to have the X column type? Dec 10 '20 at 19:52
• @Andyc yes, certainly Dec 10 '20 at 20:04

I ended up here after googling "lyx extra space in tables for dfrac", so this is an answer for LyX, but it probably also applies to plain LaTeX code.

I use the arraystretch-command in my preamble, but if I use dfrac in a cell the vertical space will not reflect the needed hight increase.

\renewcommand*\arraystretch{1.3}


The "tabu" package seems like a good solution, but the package is not recommended by several people because the author didn't tried to maintain backward compability hard enough (as stated by jon here, but I don't know if this is true though). Also I had a hard time getting the "tabu" package to work in LyX.

Anyway,

• I found a solution to expand the vertical space in a table cell both upwards and downwards vertically by simply insering an empty box-control before the cell content.

Example code for a single 3-cell row:

\hline
Logarithms & $\ln\left(x\right)$ & %
\begin{minipage}[c][10mm][t]{0.1mm}%
%
\end{minipage}$\dfrac{1}{x}$\tabularnewline


Resulting PDF without box:

Resulting PDF with box:

I used the following settings in LyX for the box:

I hope this tip can help someone to expand their vertical cell white spaces in LaTeX!

As an alternative to the outdated tabu package, the new tabularray package provides rowsep option for tables:

\documentclass{article}

\usepackage{tabularray}

\begin{document}

\begin{tblr}{|c|c|}
\hline
Cylindrical & $\displaystyle{{1 \over \rho}{\partial \over \partial\rho}\left(\rho {\partial f \over \partial \rho}\right) + {1 \over \rho^2}{\partial^2 f \over \partial \phi^2} + {\partial^2 f \over \partial z^2}}$\\\hline
Spherical & $\displaystyle{{1 \over r^2}{\partial \over \partial r}\!\left(r^2 {\partial f \over \partial r}\right) \!+\!{1 \over r^2\!\sin\theta}{\partial \over \partial \theta}\!\left(\sin\theta {\partial f \over \partial \theta}\right) \!+\!{1 \over r^2\!\sin^2\theta}{\partial^2 f \over \partial \phi^2}}$\\\hline
\end{tblr}

\bigskip

\SetTblrInner{rowsep=4pt}

\begin{tblr}{|c|c|}
\hline
Cylindrical & $\displaystyle{{1 \over \rho}{\partial \over \partial\rho}\left(\rho {\partial f \over \partial \rho}\right) + {1 \over \rho^2}{\partial^2 f \over \partial \phi^2} + {\partial^2 f \over \partial z^2}}$\\\hline
Spherical & $\displaystyle{{1 \over r^2}{\partial \over \partial r}\!\left(r^2 {\partial f \over \partial r}\right) \!+\!{1 \over r^2\!\sin\theta}{\partial \over \partial \theta}\!\left(\sin\theta {\partial f \over \partial \theta}\right) \!+\!{1 \over r^2\!\sin^2\theta}{\partial^2 f \over \partial \phi^2}}$\\\hline
\end{tblr}

\end{document}


With {NiceTabular} of nicematrix, you can use \arraystretch and \extrarowheightofarraybut you have also a keycell-space-limits.

\documentclass{article}
\usepackage{nicematrix}

\begin{document}
\begin{NiceTabular}{cc}[hvlines,cell-space-limits=3pt]
Cylindrical & $\displaystyle{{1 \over \rho}{\partial \over \partial\rho}\left(\rho {\partial f \over \partial \rho}\right) + {1 \over \rho^2}{\partial^2 f \over \partial \phi^2} + {\partial^2 f \over \partial z^2}}$\\
Spherical & $\displaystyle{{1 \over r^2}{\partial \over \partial r}\!\left(r^2 {\partial f \over \partial r}\right) \!+\!{1 \over r^2\!\sin\theta}{\partial \over \partial \theta}\!\left(\sin\theta {\partial f \over \partial \theta}\right) \!+\!{1 \over r^2\!\sin^2\theta}{\partial^2 f \over \partial \phi^2}}$\\
\end{NiceTabular}
\end{document}