Using loops to create tables
First implementation:
\documentclass{article}
\usepackage{array,booktabs}
\usepackage{xparse}
\newcommand{\myhrule}{\rule{1cm}{0.4pt}}
\ExplSyntaxOn
\NewDocumentCommand{\makeruledtabular}{mm}
{% #1 = number of rows, #2 = header
\begin{tabular}{r w{c}{2cm} w{c}{2cm} @{}}
\toprule
#2 \\
\midrule
\int_step_function:nN {#1} \__hafid_ruledtabular_line:n
\bottomrule
\end{tabular}
}
\cs_new_protected:Nn \__hafid_ruledtabular_line:n
{
#1 & \myhrule & \myhrule \\
}
\ExplSyntaxOff
\begin{document}
\makeruledtabular{10}{\multicolumn{1}{c}{\(i\)} & \(P\) & \(y_{m}\) }
\end{document}
More general implementation: the number of columns is determined from the header.
\documentclass{article}
\usepackage{array,booktabs}
\usepackage{xparse}
\newcommand{\myhrule}{\rule{1cm}{0.4pt}}
\ExplSyntaxOn
\NewDocumentCommand{\makeruledtabular}{mm}
{% #1 = number of rows, #2 = header
\hafid_ruledtabular:nn { #1 } { #2 }
}
\seq_new:N \l__hafid_ruledtabular_header_seq
\tl_new:N \l__hafid_ruledtabular_first_tl
\cs_new_protected:Nn \hafid_ruledtabular:nn
{
% absorb the header as a sequence
\seq_set_split:Nnn \l__hafid_ruledtabular_header_seq { & } { #2 }
% split off the first item, which should be centered
\seq_pop_left:NN \l__hafid_ruledtabular_header_seq \l__hafid_ruledtabular_first_tl
% Define the auxiliary function based on the number of items in the header
% At the end, if the header is 'A & B & C & D`, the function will be
% defined to do '#1 & \myhrule & \myhrule & \myhrule \\', where #1 stands
% for the current index in the loop
\cs_set_protected:Nx \__hafid_ruledtabular_line:n
{
##1
\prg_replicate:nn { \seq_count:N \l__hafid_ruledtabular_header_seq }
{ & \exp_not:N \myhrule }
\exp_not:N \\
}
\begin{tabular}
{
r
*{ \seq_count:N \l__hafid_ruledtabular_header_seq } { w{c}{2cm} }
@{}
}
\toprule
\multicolumn{1}{c}{\tl_use:N \l__hafid_ruledtabular_first_tl} &
\seq_use:Nn \l__hafid_ruledtabular_header_seq { & } \\
\midrule
\int_step_function:nN {#1} \__hafid_ruledtabular_line:n
\bottomrule
\end{tabular}
}
\ExplSyntaxOff
\begin{document}
\makeruledtabular{10}{\(i\) & \(P\) & \(y_{m}\) }
\bigskip
\makeruledtabular{15}{A & B & C & D}
\end{document}
The idea is that loop of the form ..._function:...
will deliver the whole loop before anything else is processed, so in the case of a three column table with three rows we will get
\__hafid_ruledtabular_line:n { 1 }
\__hafid_ruledtabular_line:n { 2 }
\__hafid_ruledtabular_line:n { 3 }
and only after this TeX will start to process the first item, therefore getting
1 & \myhrule & \myhrule \\
2 & \myhrule & \myhrule \\
3 & \myhrule & \myhrule \\
yielding the full table body.
Here's a LuaLaTeX-based answer. No need for the pgffor
package.
% !TEX TS-program = lualatex
\documentclass{article}
\usepackage{array,booktabs}
\newcolumntype{C}[1]{>{\centering\arraybackslash}p{#1}}
\newcommand{\myhrule}{\rule{1cm}{0.5pt}}
\usepackage{luacode}
\begin{luacode}
function print_line (i)
tex.sprint(i.."&\\myhrule&\\myhrule&\\myhrule\\\\")
end
\end{luacode}
\begin{document}
\begin{tabular}{@{} p{0.5cm} *{3}{C{2cm}} @{}}
\toprule
\(i\) & \(m\) & \(P\) & \(y_{m}\) \\
\midrule
\directlua{ for i = 1 , 10 do print_line ( i ) end }
\bottomrule
\end{tabular}
\end{document}
Addendum: Suppose you wanted to generalize the Lua code so that it prints J
rather than always 3
copies of &\\myhrule
before forcing a line break. Assuming that J=5
, say, all you'd have to do is (a) replace
function print_line (i)
tex.sprint(i.."&\\myhrule&\\myhrule&\\myhrule\\\\")
end
with
function print_line (i,J)
tex.sprint(i)
for j=1,J do tex.sprint("&\\myhrule") end
tex.sprint("\\\\")
end
and (b) change the function call
print_line ( i )
to
print_line ( i , 5)
in the argument of the subsequent \directlua
directive in the tabular
environment.
A simple solution with pgfplotstable
.
I've created a table of the desired number of rows from scratch with \pgfplotstablenew
and then display it with \pgfplotstabletypeset
.
The column styles set with \pgfplotstableset
are fully customizable.
\documentclass{article}
\usepackage{array,booktabs,pgffor}
\newcommand{\myhrule}{\rule{1cm}{0.5pt}}
\usepackage{pgfplotstable}
\pgfplotsset{compat=1.14}
\begin{document}
%set the columns style and content
\pgfplotstableset{
create on use/new/.style={create col/expr={\pgfplotstablerow+1}},
columns/new/.style={column name={\(i\)},column type={p{0.5cm}}},
create on use/emme/.style={create col/set={\myhrule}},
columns/emme/.style={column name={\(m\)},string type, column type={>{\centering\arraybackslash}p{2cm}}},
create on use/pi/.style={create col/copy={emme}},
columns/pi/.style={column name={\(P\)},string type, column type={>{\centering\arraybackslash}p{2cm}}},
create on use/yup/.style={create col/copy={emme}},
columns/yup/.style={column name={\(y_{m}\)},string type, column type={>{\centering\arraybackslash}p{2cm}}},
}
%create a table with the desidered number of rows
\pgfplotstablenew[
columns={new, emme, pi, yup}
]{9}% <--- put here the number of rows you like
\loadedtable
%display the table
\pgfplotstabletypeset[
every last row/.style={after row=\bottomrule},
every head row/.style={before row=\toprule,after row=\midrule},
]\loadedtable
\end{document}