Following up on the work-around, here is my improved code for xtable. What doesn’t work is:

* alignment on the decimal separator takes place only in the first column with decimals (i.e. B), not on the following one; this is independent of R1 having a decimal value in this column or not * row spanning is now tricky since the width of the header column is taken for the first of the three rows spanned, which becomes even more complicated with option=stretch, I guess if I right align the second column and would phantomize the hsize of the header, this could work with a bit of optimization. What I like about this approach however is that one could read the two arguments from a CSV file, which would save a lot of typing (and to manually specify the padding). \def\mpm#1#2{ \doifsomethingelse{#2}{ \startxcell[align=left] \digits{#1} \stopxcell \startxcell ± \stopxcell \startxcell \digits{#2} \stopxcell }{ \startxcell[align=left] \digits{#1} \stopxcell \startxcell \stopxcell \startxcell \digits{#2} \stopxcell } } \startxtable[split=repeat, aligncharacter=yes, alignmentcharacter={.}] \startxtablehead \startxrow[topframe=on, foregroundstyle=bold] \startxcell A \stopxcell \startxcell[align=left, nx=3] Bla bla bla bla bla bla bla bla \stopxcell \startxcell C \stopxcell \stopxrow \stopxtablehead \startxtablebody \startxrow[topframe=on] \startxcell R1 \stopxcell \mpm{12.3}{}%{1.5} \startxcell one \stopxcell \stopxrow \startxrow \startxcell R2 \stopxcell \mpm{0.01}{0.023} \startxcell two \stopxcell \stopxrow \startxrow \startxcell R3 \stopxcell \mpm{2.3}{0.1} \startxcell three\stopxcell \stopxrow \stopxtablebody \stopxtable > On 7 May 2020, at 21:22, Benjamin Buchmuller <benjamin.buchmul...@gmail.com> > wrote: > > Hi Wolfgang, > > you are (of course) right again. I realised that I wouldn’t get the expected > behaviour after checking the snippet isolated from my document’s context, > where it is embedded in a \startplacetable[…]{}{}. I’m still learning to get > the gist of the \doifs, the curly and square bracketed arguments and so on. > Thanks for the hint! > > Seems like I’m going to make three cells and span the header column for now, > though I guess it would be a nice feature to have the padding working in the > other cases. > > I’ll write a feature request for no 4. > > Thanks! > > >> On 7 May 2020, at 20:00, Wolfgang Schuster >> <wolfgang.schuster.li...@gmail.com> wrote: >> >> Benjamin Buchmuller schrieb am 07.05.2020 um 19:41: >>> Hi Wolfang, >>> Thank you for your reply. I have indeed not explained my intended result >>> very clearly. >>> 1. >>> Primarily, I need to get the two values aligned at the digit separator of >>> the first and second number respectively and overall at the ± sign. I’m >>> working in an xtable, where I have entries such as >>> \startxcell \mpm{14.0==}{_1.5==} \stopxcell >>> \startxcell \mpm{_0.034}{_0.013} \stopxcell >>> and defined >>> \def\mpm#1#2{ >>> \ifsecondargument >>> \digits{#1}\,±\,\digits{#2}% >>> \else >>> \digits{#1}% >>> \fi >>> } >> >> Is there something missing in here because the \ifsecondargument check here >> makes non sense because the second argument is mandatory and not optional. >> >> Is this what you want? >> >> \define[2]\mpm >> {\digits{#1}% >> \doifsomething{#2}{\,±\,\digits{#2}}} >> >>> Since I was hoping that I could exploit the zeropadding of \digits to get >>> the format right. Indeed, it would save a lot of typing, if I wouldn’t have >>> to specify the padding manually and I vaguely recall that there is >>> somewhere a ConTeXt solution that can make such alignments, but I simply >>> can’t find it any more … >> >> You can align number on the decimal point (comma) but this works only when >> you have only one number in a cell. >> >> \starttext >> >> \startxtable[aligncharacter=yes,alignmentcharacter=±] >> \startxrow >> \startxcell >> \digits {14.0} ± \digits {1.5} >> \stopxcell >> \stopxrow >> \startxrow >> \startxcell >> \digits {0.034} ± \digits {0.013} >> \stopxcell >> \stopxrow >> \stopxtable >> >> \stoptext >> >>> 2. + 3. >>> Absolutely right, this is my bad. I have badly mixed from Hans’ solution to >>> a similar problem, >>> https://www.mail-archive.com/ntg-context@ntg.nl/msg00724.html >>> which was actually \def\zeroamount{-} and the example in the source, I >>> didn’t read properly. Just skip that part. :) >> >> The message is from 2003! >> >>> 4. >>> Indeed, >>> \startxcell \mpm{14.==}{_1.5=} \stopxcell >>> \startxcell \mpm{_0.03}{_0.01} \stopxcell >>> aligns properly. But sometimes, I have the first digit specified, but not >>> the second and unfortunately this doesn’t work >>> \startxcell \mpm{14.5=}{_1.5=} \stopxcell >>> \startxcell \mpm{_0.03}{_0.01} \stopxcell >>> because = is not immediately preceded by . >> >> Can you write another mail with a request for this. >> >> Wolfgang > ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________