\overrightarrow not working in mathmode in Metapost?

\overrightarrow not working in mathmode in Metapost?

[Matthijs Kooijman]

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Hi,

I've been trying to use the \overrightarrow command within a metapost graphic,
but it doesn't work. Math mode does work, for example \vec works like
expected. Outside of metapost, \overrightarrow works as expected.

To illustrate the problem, I've created the following simple testcase:

  \starttext
  \startMPcode
  draw btex $\vec{foo}$ etex;
  draw btex $\overrightarrow{foo}$ etex;
  \stopMPcode
  \stoptext

This gives the following error output:

  ! Undefined control sequence.
  \dodosmash [#1]->\edef \@@smash 
                                  {#1}\futurelet \nexttoken \dododosmash
  \relbar ->\mathrel {\smash 
                             -}
  \mtharrowfill ...inmuskip \thickmuskip \relax #8#5
                                                    \mkern -#1mu \cleaders
  \hb...
  \dodohandlemathoverarrow ...{\ialign {##\crcr #2#3
                                                    \crcr \noalign {\kern
  #1\n...
  \mathpalette ...>\mathchoice {#1\displaystyle {#2}
                                                    }{#1\textstyle
  {#2}}{#1\sc...
  <argument> ...ex; draw btex $\overrightarrow {foo}
                                                    $ etex;
  ...
  l.5 \stopMPcode

It seems the \overrightarrow command uses \@@smash, which isn't defined when
running from metapost?

Is this expected? Is this a bug?

Gr.

Matthijs

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Re: \overrightarrow not working in mathmode in Metapost?

[Aditya Mahajan]

On Fri, 18 Sep 2009, Matthijs Kooijman wrote:

> Hi,
>
> I've been trying to use the \overrightarrow command within a metapost graphic,
> but it doesn't work. Math mode does work, for example \vec works like
> expected. Outside of metapost, \overrightarrow works as expected.
>
> To illustrate the problem, I've created the following simple testcase:
>
>  \starttext
>  \startMPcode
>  draw btex $\vec{foo}$ etex;
>  draw btex $\overrightarrow{foo}$ etex;
>  \stopMPcode
>  \stoptext
>
> This gives the following error output:
>
> It seems the \overrightarrow command uses \@@smash, which isn't defined when
> running from metapost?
>
> Is this expected? Is this a bug?

This is a bug in math-arr. All arrow macros should be unexpanded (but I 
could not figure out how). Here is a workaround

\let\normaloverrightarrow\overrightarrow
\unexpanded\def\overrightarrow{\normaloverrightarrow}

Aditya

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Re: \overrightarrow not working in mathmode in Metapost?

[Matthijs Kooijman]

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Hi Aditya,

> \let\normaloverrightarrow\overrightarrow
> \unexpanded\def\overrightarrow{\normaloverrightarrow}
I haven't got a clue what this means, but it worked! Thanks!

Gr.

Matthijs

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Re: \overrightarrow not working in mathmode in Metapost?

[Hans Hagen]

Aditya Mahajan wrote:

> \let\normaloverrightarrow\overrightarrow
> \unexpanded\def\overrightarrow{\normaloverrightarrow}

ok, i made them all unexpandable


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Re: \overrightarrow not working in mathmode in Metapost?

[Matthijs Kooijman]

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Hi all,

> >I've been trying to use the \overrightarrow command within a metapost graphic,
> >but it doesn't work. Math mode does work, for example \vec works like
> >expected. Outside of metapost, \overrightarrow works as expected.
This seems to broken for extensible math arrows like \xrightarrow as well.

> \let\normaloverrightarrow\overrightarrow
> \unexpanded\def\overrightarrow{\normaloverrightarrow}
And this fix helps there as well. Could this perhaps be fixed in general for
all extensible arrows?

Gr.

Matthijs

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Re: \overrightarrow not working in mathmode in Metapost?

[Taco Hoekwater]

Matthijs Kooijman wrote:
> Hi all,
> 
>>> I've been trying to use the \overrightarrow command within a metapost graphic,
>>> but it doesn't work. Math mode does work, for example \vec works like
>>> expected. Outside of metapost, \overrightarrow works as expected.
> This seems to broken for extensible math arrows like \xrightarrow as well.
> 
>> \let\normaloverrightarrow\overrightarrow
>> \unexpanded\def\overrightarrow{\normaloverrightarrow}
> And this fix helps there as well. Could this perhaps be fixed in general for
> all extensible arrows?

Have you tried the new current yet? There was a whole bunch of extra
\unexpanded-s  in it already.

Best wishes,
Taco
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Re: \overrightarrow not working in mathmode in Metapost?

[Matthijs Kooijman]

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Hi Taco,

> Have you tried the new current yet? There was a whole bunch of extra
> \unexpanded-s  in it already.
You're right, thanks! I had built the new context but forgot to install it on
this particular machine :-)

Sorry for the noise,

Matthijs

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