Dear ConTeXt folks,


looking for graphics example and therefore searching the list I found
the answer from David Arnold in the ntg-context list thread »OT: looking
for metapost/fun examples« [1].

It is for plain MetaPost and works fine with `mpost` after making sure
to remove the line breaks inserted by the mail program.

I then copied it into `\{start,stop}useMPgraphic`, removed the `end ;`
and `{begin,end}fig` and replaced `{e,b}tex` by `textext()` but still
get the following error.

        ! terminal: ! Redundant equation.
        <to be read again> 
                           ;
        <*> ...500; dt:=(tstop-tstart)/N; (b-a)*ux=1.75in;
                                                           (d-c)*uy=1.75in; q=(a,c)-...
        
        ! Redundant equation.
        <to be read again> 
                           ;
        <*> ...start)/N; (b-a)*ux=1.75in; (d-c)*uy=1.75in;
                                                           q=(a,c)--(b,c)--(b,d)--(a...
        
        
        .
        
        system          > tex > error on line 39 in file arnold-2005.tex: terminal: ! Redundant equation.
        <to be read again> 
                           ;
        <*> ...500; dt:=(tstop-tstart)/N; (b-a)*ux=1.75in;
                                                           (d-c)*uy=1.75in; q=(a,c)-...
        
        ! Redundant equation.
        <to be read again> 
                           ;
        <*> ...start)/N; (b-a)*ux=1.75in; (d-c)*uy=1.75in;
                                                           q=(a,c)--(b,c)--(b,d)--(a...

Does someone have an idea why this fails and how to fix it?


Thanks,

Paul


[1] http://www.ntg.nl/pipermail/ntg-context/2005/009928.html