MPdefinitions

MPdefinitions

[Vedran Miletić]

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Hi,

compiling example with quadriliterals and \startMPdefinitions{solvers}
\stopMPdefinitions from MetaFun manual, regardless of the code that is
commented out inside MPdefintions environment, gives:

! You can't use `\relax' after \the.

system          > tex > error on line 30 in file solvers.tex: You can't use
` ...

20     %  z1=0.5[z11,z13] ; z2=0.5[z21,z23] ;
21     %  z3=0.5[z31,z33] ; z4=0.5[z41,z43] ;
22     %  draw z1--z3 dashed evenly ; draw z2--z4 dashed evenly ;
23     %  z0=whatever[z1,z3]=whatever[z2,z4] ;
24     %  mark_rt_angle (z1,z0,z2);
25     %  if show_labels>0:
26     %  draw_problem_labels ;
27     %  fi;
28     %  endgroup ;
29     %  enddef ;
30 >>  \stopMPdefinitions
31
32     \starttext
33     %a
34     \stoptext

<recently read> \@MPF@::solvers

\dostartMPdefinitions ...er {\the \MPinstancetoks
                                                  #2}
l.30 \stopMPdefinitions

Is this a bug?

Vedran

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Re: MPdefinitions

[Wolfgang Schuster]

Am 23.05.2011 um 12:02 schrieb Vedran Miletić:

> Hi,
> 
> compiling example with quadriliterals and \startMPdefinitions{solvers} \stopMPdefinitions from MetaFun manual, regardless of the code that is commented out inside MPdefintions environment, gives:
> 
> ! You can't use `\relax' after \the.
> 
> system          > tex > error on line 30 in file solvers.tex: You can't use ` ...
> 
> 20     %  z1=0.5[z11,z13] ; z2=0.5[z21,z23] ;
> 21     %  z3=0.5[z31,z33] ; z4=0.5[z41,z43] ;
> 22     %  draw z1--z3 dashed evenly ; draw z2--z4 dashed evenly ;
> 23     %  z0=whatever[z1,z3]=whatever[z2,z4] ;
> 24     %  mark_rt_angle (z1,z0,z2);
> 25     %  if show_labels>0:
> 26     %  draw_problem_labels ;
> 27     %  fi;
> 28     %  endgroup ;
> 29     %  enddef ;
> 30 >>  \stopMPdefinitions
> 31     
> 32     \starttext
> 33     %a
> 34     \stoptext
> 
> <recently read> \@MPF@::solvers 
>                                 
> \dostartMPdefinitions ...er {\the \MPinstancetoks 
>                                                   #2}
> l.30 \stopMPdefinitions
> 
> Is this a bug?

Please send a complete example!

Wolfgang

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Re: MPdefinitions

[Vedran Miletić]

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2011/5/23 Wolfgang Schuster <schuster.wolfgang@googlemail.com>

> Please send a complete example!
>

Sure:

\startMPdefinitions{solvers}
\stopMPdefinitions

\starttext
Hello.
\stoptext
or this:

\startMPdefinitions{solvers}
def draw_problem (expr p, q, r, s, show_lables)=
begingroup ; save x, y, a, b, c, d, e, f, g, h ;
z11=z42=p ; z21=z12=q ; z31=z22=r ; z41=z32=s ;
a=x12-x11 ; b=y12-y11 ; c=x22-x21 ; d=y22-y21 ;
e=x32-x31 ; f=y32-y31 ; g=x42-x41 ; h=y42-y41 ;
z11=(x11, y11) ; z12=(x12, y12) ;
z13=(x12-b, y12+a) ; z14=(x11-b, y11+a) ;
z21=(x21, y21) ; z22= (x22, y22);
z23=(x22-s,y22+c) ; z24=(x21-d, y21+c) ;
z31=(x31, y31) ; z32=(x32, y32) ;
z33=(x32-f, y32+e) ; z34=(x31-f, y31+e);
z41=(x41, y41) ; z42=(x42, y42) ;
z43=(x42-h,y42+g) ; z44=(x41-h,y41+g) ;
pickup pencircle scaled .5pt ;
draw z11--z12--z13--z14--cycle ; draw z11--z13 ; draw z12--z14 ;
draw z21--z22--z23--z24--cycle ; draw z21—z23 ; draw z22—z24 ;
draw z31--z32--z33--z34--cycle ; draw z31—z33 ; draw z32—z34 ;
draw z41--z42--z43--z44--cycle ; draw z41—z43 ; draw z42—z44 ;
z1=0.5[z11,z13] ; z2=0.5[z21,z23] ;
z3=0.5[z31,z33] ; z4=0.5[z41,z43] ;
draw z1--z3 dashed evenly ; draw z2--z4 dashed evenly ;
z0=whatever[z1,z3]=whatever[z2,z4] ;
mark_rt_angle (z1,z0,z2);
if show_labels>0:
draw_problem_labels ;
fi;
endgroup ;
enddef ;
\stopMPdefinitions

\starttext
Hello.
\stoptext

Result is the same.

Vedran

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Re: MPdefinitions

[Wolfgang Schuster]

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Am 23.05.2011 um 17:37 schrieb Vedran Miletić:

> 2011/5/23 Wolfgang Schuster <schuster.wolfgang@googlemail.com>
> Please send a complete example!
> 
> Sure:
> 
> […]

Add

\defineMPinstance
  [solvers]
  [format=metafun,
   extensions=yes,
   initializations=yes]

before \startMPdefintions or omit the argument (i.e. “{solvers}”)
from the \startMPdefintions command.

Wolfgang


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___________________________________________________________________________________

Re: MPdefinitions

[Vedran Miletić]

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2011/5/23 Wolfgang Schuster <schuster.wolfgang@googlemail.com>

>
> Am 23.05.2011 um 17:37 schrieb Vedran Miletić:
>
> 2011/5/23 Wolfgang Schuster <schuster.wolfgang@googlemail.com>
>
>> Please send a complete example!
>>
>
> Sure:
>
> […]
>
>
> Add
>
> \defineMPinstance
>   [solvers]
>   [format=metafun,
>    extensions=yes,
>    initializations=yes]
>
> before \startMPdefintions or omit the argument (i.e. “{solvers}”)
> from the \startMPdefintions command.
>

Great, thanks.

Why does the code in attachment then produce "undefined"? It's an example
from MetaFun book.

Vedran

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