Insert n empty rows using tblr

Question

I just wanted to insert n empty rows using tlbr like this:

\documentclass[letterpaper]{article} \usepackage{expl3} \ExplSyntaxOn \cs_new_eq:NN \makerows \prg_replicate:nn \ExplSyntaxOff \usepackage{tabularray} \begin{document} With tabular: \begin{tabular}{|c|c|c|c|} \hline a & b & c & d \\\hline \makerows{5}{ & & & \\\hline} \end{tabular} With tblr: \begin{tblr}{|c|c|c|c|} \hline a & b & c & d \\\hline %\makerows{5}{ & & & \\\hline} %% Gives % ! Misplaced alignment tab character &. % <argument> & % & & \\\hline \end{tblr} \end{document}

Using tabular it works, using tblr it doesn't . How can I fix this?

See my answer to a question yesterday concerning a similar issue with tblr, tblr needs to see the & in advance, I tried using expand=\makerows in your question but it still doesn't work, hopefully someone else can help!: tex.stackexchange.com/a/691258/273733 — piJT
– piJT, Commented Jul 17, 2023 at 13:01
@JamesT: In the meantime I found some variations which work, see my answer below. But I don't really understand why some work and others don't. — student
– student, Commented Jul 17, 2023 at 18:55
The lua version is interesting how that works, will try that in the future, nice workaround — piJT
– piJT, Commented Jul 17, 2023 at 19:40

student · Accepted Answer · 2023-07-18 05:34:59Z

This seems to work:

\documentclass{article} \usepackage[T1]{fontenc} \usepackage{expl3,xparse} \usepackage{tabularray} \UseTblrLibrary{functional} \IgnoreSpacesOn \prgNewFunction \makerows {m} { \intReplicate {#1} {{} & & & \\\hline } } \IgnoreSpacesOff \begin{document} With tabular: \begin{tabular}{|c|c|c|c|} \hline a & b & c & d \\\hline \makerows{5} \end{tabular} With tblr: \begin{tblr}[evaluate=\makerows]{|c|c|c|c|} \hline a & b & c & d \\\hline \makerows{5} \end{tblr} \end{document}

Adapted from the example of the tabularray manual on page 46. However I am not quite sure why I need the empty {} in the definition of my empty row.

Nevertheless I want to understand why the initial latex3 approach didn't work. The problem seems to be related to the replicate function.

Edit

Using lualatex seems to work with the expand-key as mentioned by @JamesT in the comment above:

\documentclass{article} \usepackage{tabularray} \usepackage{luacode} \begin{luacode} function makerows(n) for i = 1, n do tex.sprint("& & & \\\\\\hline") end end \end{luacode} \begin{document} \begin{tblr}[expand=\directlua]{c|c|c|c} a & b & c & d \\\hline \directlua{makerows(10)} \end{tblr} \end{document}

Edit 2

I also tried pythontex which does not work even with the expand key:

\documentclass{article} \usepackage{tabularray} \usepackage[gobble=auto]{pythontex} \begin{pycode} def makerows(n): for i in range(0,n): print(r"& & & \\\hline") \end{pycode} \begin{document} \begin{tblr}[expand=\pyc]{c|c|c|c} a & b & c & d \\\hline \pyc{makerows(3)} \end{tblr} \end{document}

I guess it doesn't work, because

Printed content is saved in a file and then included via \InputIfFileExists. But \InputIfFileExists is not expandable

as described here.

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