What is the difference between a tabular and an array environment? When should be used the former and when the latter?
[Tex/LaTex] Difference between tabular and array environment
arraystables
Related Solutions
For smaller (single column) inclusions of an array/tabular-style object in your table, you may also consider using the the makecell package in the following way:
\documentclass{minimal}
\usepackage{makecell}
\begin{document}
\begin{tabular}{ccc}
A & B & C \\
D & \makecell[c]{$E$ \\ F} & G \\
H & I & J
\end{tabular}
\end{document}
It's been a while since I played with NumPy, but I used to call the numpy.savetxt function to export my data as a .csv format:
import numpy
A = numpy.random.randn(4,4)
numpy.savetxt("mydata.csv", A)
The sample file mydata.csv was generated accordingly:
1.058690791897618361e-01 4.236767150069661314e-01 -9.871862191240249329e-02 1.896410657805123634e+00
-3.688082441801866507e-01 -6.185162583308108086e-01 7.779589745526608313e-01 -1.718082361568575633e+00
-2.750126418674324058e-01 1.636150392013778487e-01 -5.227282169549336555e-01 6.038835633452429574e-01
-1.113971762033877821e+00 -1.572603551712207670e+00 -6.206581544211196011e-01 -1.960843071998005893e+00
With the magic of pgfplotstable, we could do the following:
\documentclass{article}
\usepackage{pgfplotstable}
\usepackage{array}
\begin{document}
\begin{table}
\centering
\pgfplotstabletypeset[dec sep align,
fixed zerofill,
precision=4,
col sep=space]{mydata.csv}
\end{table}
\end{document}
I don't know if it's possible to remove the headers, but in any case I'll ask Christian Feuersänger about it. :)
My good friend percusse provided a nice way of removing those headers:
\pgfplotstabletypeset[%
fixed zerofill,
precision=4,
col sep=space,
dec sep align,
columns/0/.style ={column name=},
columns/1/.style ={column name=},
columns/2/.style ={column name=},
columns/3/.style ={column name=},
]{mydata.csv}
Another, well, "way" of doing it is by tricking numpy.savetxt to act as:
numpy.savetxt("mydata.csv", a, delimiter=' & ', fmt='%2.2e', newline=' \\\\\n')
which will give us the following output file:
1.21e+00 & 3.52e-01 & -5.53e-01 & 7.28e-01 \\
-1.61e+00 & 6.72e-01 & 5.75e-01 & -1.00e+00 \\
3.60e-01 & 1.68e-01 & -1.65e+00 & 2.10e-01 \\
5.73e-01 & -7.29e-03 & 1.65e+00 & -1.37e+00 You could remove the last `\\` and paste it inside a `tabular` enviroment. And thanks to `siunitx`, we get a nice formatting:
\documentclass{article}
\usepackage{siunitx}
\begin{document}
\begin{table}
\begin{center}
\begin{tabular}{SSSS}
1.21e+00 & 3.52e-01 & -5.53e-01 & 7.28e-01 \\
-1.61e+00 & 6.72e-01 & 5.75e-01 & -1.00e+00 \\
3.60e-01 & 1.68e-01 & -1.65e+00 & 2.10e-01 \\
5.73e-01 & -7.29e-03 & 1.65e+00 & -1.37e+00
\end{tabular}
\end{center}
\end{table}
\end{document}
At last but not least, datatool can also be used. Unfortunately, it seems that datatool does not recognize scientific notation as real values, so it treats like a string value. To fix it, I exported my .csv file with a comma as delimiter and with fixed-point values:
numpy.savetxt("mydata.csv", a, delimiter=',', fmt='%2.2f')
which will generate the following output:
1.24,-0.96,-1.51,-0.21
0.93,-1.37,0.30,-0.89
0.33,-0.16,-1.27,-0.02
1.08,1.22,0.29,0.15
Now, our LaTeX code, based on Alan's answer:
\documentclass{article}
\usepackage{datatool}
\usepackage{siunitx}
\begin{document}
\DTLloaddb[noheader, keys={0,1,2,3}]{db}{mydata.csv}
\begin{table}
\sisetup{%
parse-numbers=false,
table-number-alignment=left,
table-figures-integer=4,
table-figures-decimal=4,
input-decimal-markers={.}
}
\renewcommand*\dtlrealalign{S}
\centering
\DTLdisplaydb{db}
\end{table}
\end{document}
By using \DTLdisplaydb, headers are mandatory. If you don't want them, you can iterate through the values of the .csv value instead.
You can obtain more information on those packages by searching their tags: siunitx, datatool, pgfplotstable
Thanks to Jake, percusse and Alan. :)
Best Answer
The
arrayenvironment is formath modeand cell contents will be typeset in math mode (textstyleby default) andtabularis fortext mode.While array requires being in math mode, the
tabularenvironment can be used inmath mode, and its contents will be typeset intext mode. Inside anarray, the p, m or b specifiers also switch cell contents to text mode.