[texhax] A useful macro?
Philip TAYLOR
P.Taylor at Rhul.Ac.Uk
Sun Apr 23 18:51:18 CEST 2006
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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