At 10:31 PM 12/5/2001 +0100, Tobias Burnus wrote:
>Hi,
>
>I have a nice document where I need to perform small calculation (actually
>only calculating the average value):
> if((#1+#2+#3) != 0)
> (#1*1 + #2*2 + #3*3)/(#1+#2+#3)
> else
> "--"
>
>Now I was thinking where I could do so in TeX. (I think there are some
>macros in ConTeXt, but I cannot find them.)
You can play a bit with etex's \dimexpr and \numexpr (docu on tex live)
\def\Tobiased#1#2#3%
{\ifdim\dimexpr(#1pt+#2pt+#3pt)=\zeropoint
\else
\expandafter\withoutpt\the\dimexpr
(\dimexpr(1\dimexpr(#1pt) + 2\dimexpr(#2pt) + 3\dimexpr(#3pt))/
\dimexpr( #1pt + #2pt + #3pt))
\fi}
\Tobiased{10}{150}{310.2}
So, te numbers become dimens and are stripped afterwards
>The output should be of the form "1{,}4" (i.e. separator is a {,} and I
>get one figure after the separator).
How about:
\def\OneAfter#1%
{\expandafter\beforesplitstring#1\at.\to\Before
\expandafter\aftersplitstring#1\at.\to\After
\Before.\expandafter\AfterIndeed\After0000\relax}
\def\AfterIndeed#1#2#3\relax{#1}
\OneAfter{1.23}
\OneAfter{1}
\def\Oeps{1.234}
\OneAfter\Oeps
You can probably figure out the rest
Hans
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