Hi Hans, On Fri, Jan 3, 2025 at 09:13 (+0100), Hans Hagen wrote:
> On 1/3/2025 1:56 AM, Jim wrote: >> Hi, >> I was perusing an update to >> https://wiki.contextgarden.net/index.php?title=Framed&diff=next&oldid=35583 >> and noticed that the grey math was not properly aligned on the wiki page. >> But then I tried it on my system, and, worse yet, I found out that >> \setuppapersize[A5] >> \setupcolors[state=start] >> \def\graymath{\mframed[frame=off, >> background=color, >> backgroundcolor=gray, >> backgroundoffset=3pt]} >> \starttext >> \startformula >> {x^3\over3} - 2 >> \stopformula >> \stoptext >> creates a fraction that I would expect from >> {x^3\over3 - 2} >> Is this just my (newly updated) context, or has the year 2025 started off >> with a \over problem? > It's been so for a while. In fact, using \over was never advocated OK, I'm not entirely surprised by that. But... as mentioned, I see it used in the wiki. And I know that the wiki isn't the same sort of official documentation as the manual, but (a) there it is, and (b) in the wiki it works. I know little about the wiki, is it using some other/older version of ConTeXt (e.g., Mk II or Mk IV) to generate the examples? If the answer is "yes", is that something that should be reconsidered? > For various reasons you should use: > \frac{x^3}{3} - 2 > Here are some: > - in lmtx we configure {} to as anywhere else in tex: grouping or argument > delimiters; if not it will always create atoms > - \over is a special but confusing case of parsing where, when it is seen, > tex will take the previous atom and pair that with an upcoming only case of > such parsing > - just try to predict what > {x} \over {y} > {x+1} \over {y} > x + {1} \over {y} > x + 1\over y > {x + {1} \over {y}} > {x + 1\over y} > etc etc are supposed to do especially when you also mix in > \scriptstyle, \red, \bf or alike in different places in or ourside these { } I will admit in my plain TeX documents I always used {<numer> \over <denom>} to let TeX know the extent of the numerator and denominator, and it always (?!) did The Right Thing (i.e., typeset a fraction with "numer" over "denom"), but I don't tend to use hugely complicated fractions, so maybe I could have run into problems if I tried trickier things. > - this means that when one wants to control rendering rather dirty tricks > have to be used to might not always work > - for that reason \frac is there (afaik not only in context): we can control > how the numerator and denominator are handled in more detail > - in lmtx (see the extended math manual) we've spend a lot (!) of time on > improving math rendering and spacing especially, so in our case fractions > are native classes > I'm sure Mikael can add some more arguments ... like different kind of > fractions, skrewed fraction etc, but maybe best read the quite extensive > mathincontext manual first. Thanks for your comments and the pointer to the manual. Back to the wiki: I have made some edits to the wiki here and there when I got (more or less) definitive statements from someone who I assumed is a ConTeXt "guru" (or higher), or when I was correcting some typo or grammar error, or when I added an example I thought was enlightening. In this case, the edit is major, and I would not want anyone to feel I was stepping on anyone's toes by rewriting the examples in the framed page. Has anyone who has read this far care to comment on the wiki questions: (1) Why does \over work correctly in the \framed wiki example, and (2) Should the example there be re-written to use preferred ConTeXt syntax? Cheers. Jim ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) archive : https://github.com/contextgarden/context wiki : https://wiki.contextgarden.net ___________________________________________________________________________________
