Re: [NTG-context] math: command for absolute value: `\define\abs[1]{\lvert #1 \rvert}` throws `\lvert ->\Udelimiter`.

2011-06-04 Thread Otared Kavian 
Hi 

I think the error comes from your way of using \define: you use
 \define\abs[1]{\lvert #1 \rvert}
instead of
\define[1]\abs{\lvert#1\rvert}

 the following works fine for me:

\starttext

%\define[1]\abs{|#1|} % this works

\define[1]\abs{\lvert#1\rvert} % this works too

$\abs{-1} = 1$
\stoptext

Best regards: OK

On 4 juin 2011, at 22:40, Paul Menzel wrote:

> Dear ConTeXt folks,
> 
> 
> I want to define `\abs` as the command for the absolute value. The
> following minimal example is also attached.
> 
>\define\abs[1]{\lvert #1 \rvert}
>\starttext
>$\lvert 2 \rvert$
> 
>$\abs{2}$
>\stoptext
> 
> This does not work though.
> 
>$ context abs
>[…]
>This is LuaTeX, Version beta-0.70.1-2011051923 (rev 4277) 
> \write18 enabled.
>(abs.tex
> 
>ConTeXt  ver: 2011.05.18 22:26 MKIV  fmt: 2011.5.27  int: 
> english/english
>[…]
>! Missing $ inserted.
> 
>system  > tex > error on line 1 in file abs.tex: Missing $ 
> inserted ...
> 
>1 >>  \define\abs[1]{\lvert #1 \rvert}
>2 \starttext
>3 $\lvert 2 \rvert$
>4 
>5 $\abs{2}$
>6 \stoptext
>7 
> 
> 
>$
> 
>   \Udelimiter 
>\lvert ->\Udelimiter 
> "4 "0 "7C 
>l.1 \define\abs[1]{\lvert
>  #1 \rvert}
>?
> 
> How should I do that correctly? I took that example from the user’s
> guide of the amsmath package (`texdoc amsldoc`).
> 
> 
> Thanks,
> 
> Paul
> ___
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Re: [NTG-context] math: command for absolute value: `\define\abs[1]{\lvert #1 \rvert}` throws `\lvert ->\Udelimiter`.

2011-06-04 Thread Peter Münster 
On Sat, Jun 04 2011, Paul Menzel wrote:

> I want to define `\abs` as the command for the absolute value. The
> following minimal example is also attached.
>
> \define\abs[1]{\lvert #1 \rvert}

Don't ask me why "\define" doesn't work (certainly related to
expansion), but "\def" does the job:

\def\abs#1{\lvert #1 \rvert}

-- 
   Peter
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[NTG-context] math: command for absolute value: `\define\abs[1]{\lvert #1 \rvert}` throws `\lvert ->\Udelimiter`.

2011-06-04 Thread Paul Menzel 
Dear ConTeXt folks,


I want to define `\abs` as the command for the absolute value. The
following minimal example is also attached.

\define\abs[1]{\lvert #1 \rvert}
\starttext
$\lvert 2 \rvert$

$\abs{2}$
\stoptext

This does not work though.

$ context abs
[…]
This is LuaTeX, Version beta-0.70.1-2011051923 (rev 4277) 
 \write18 enabled.
(abs.tex

ConTeXt  ver: 2011.05.18 22:26 MKIV  fmt: 2011.5.27  int: 
english/english
[…]
! Missing $ inserted.

system  > tex > error on line 1 in file abs.tex: Missing $ 
inserted ...

1 >>  \define\abs[1]{\lvert #1 \rvert}
2 \starttext
3 $\lvert 2 \rvert$
4 
5 $\abs{2}$
6 \stoptext
7 

 
$
 
   \Udelimiter 
\lvert ->\Udelimiter 
 "4 "0 "7C 
l.1 \define\abs[1]{\lvert
  #1 \rvert}
?

How should I do that correctly? I took that example from the user’s
guide of the amsmath package (`texdoc amsldoc`).


Thanks,

Paul
\define\abs[1]{\lvert #1 \rvert}
\starttext
$\lvert 2 \rvert$

$\abs{2}$
\stoptext


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