[NTG-context] odd behaviour of mp odd function in lmtx

Hans Hagen j.hagen at xs4all.nl
Fri Jan 8 00:46:11 CET 2021


On 1/7/2021 8:03 PM, Damien Thiriet wrote:
> Hi,
> 
> 
> I may have found the bug that broke my metafun
> file. Looks like it is connected to odd function.
> 
> This snippet of code:
> 
> \starttext
> 
> \startMPpage
> path p;p:=origin--(20,20);
> draw p;
> draw p reflectedabout ((10,10),(10,-10)) withcolor red;
> for i=1 upto 2:
>     if odd i:
>        draw p yshifted 20 withcolor green;
>     else:
>        draw p xshifted 20 withcolor blue;
>     fi;
> endfor;
> 
> 
> \stopMPpage
> 
> \stoptext
> 
> does not compile as I would expect (no green
> line drawn). I noticed such behaviour in
> 2020.12.30 16:45
> version. I updated a few minutes ago and have
> the same output.
for now use this:

  let odd = relax;
  vardef odd expr n = ((abs(n) mod 2) == 1) enddef ;

I got it fixed (scaled, double and decimal) but no upload now

Hans


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