[texhax] A useful macro?
Michael Barr
mbarr at math.mcgill.ca
Sun Apr 23 19:00:49 CEST 2006
Looks just about perfect.
Thanks, Michael
On Sun, 23 Apr 2006, Philip TAYLOR wrote:
> Is this any use, Michael ?
>
> \def \seq #1{\innerseq #1,\sentinel}
>
> \def \innerseq #1,#2\sentinel%
> {%
> #1%
> \ifx \sentinel #2\sentinel
> \else
> ,\,\innerseq #2\sentinel
> \fi
> }
>
> \long \def \test #1{{\let \, = \relax \xdef \result {\seq {#1}}}{\tt \meaning \result}\par}
>
> \test {x,y,z}
> \test {x_1,x_2,\ldots,x_n}
> \test {x_1,x_2,x_3,\ldots}
>
> \end
>
> Philip Taylor
> --------
> Michael Barr wrote:
> > Could someone design a macro, say call it \seq, such that any comma inside
> > the parameter of \seq would expand to ,\, . So that \seq{x,y,z} would
> > give x,\,y,\,z, \seq{x_1,x_2,\ldots,x_n} would give
> > x_1,\,x_2,\,\ldots,\,x_n , and \seq{x_1,x_2,x_3,\ldots} would give
> > x_1,\,x_2,\,x_3,\,\ldots . You could try giving it mathcode 8000 and
> > defining it inside math mode to give ,\, but there is no way to just have
> > an ordinary comma then.
> >
> > Michael Barr
>
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