[XeTeX] On an ugly hack to mathbf only in the local style.

Tobias Schoel liesdiedatei at googlemail.com
Wed Oct 31 07:19:14 CET 2012

I'm not quite sure, if I have understood the OP correctly. But if he 
wants just the first letter to be bold, than the following seems to 
works just ok:

\renewcommand{\vec}[1]{\mathbf #1}

As LaTeX only reads the next “thing” after a command as the argument, if 
not grouped by {}, then only the first letter of the argument is passed 
to \mathbf.

If more than one letter needs to be bold, than you can put that part 
into a command (but Ross' reply would be preferable in all cases):

So try this out:

\renewcommand{\vec}[1]{\mathbf #1}
\[\vec{x_1} \qquad \vec{\hallo_1} \qquad \vec{x^1} \qquad \vec{\hallo^1}\]



On 31.10.2012 01:16, Zdenek Wagner wrote:
> 2012/10/30 Michaël Cadilhac <michael at cadilhac.name>:
>> On Tue, Oct 30, 2012 at 10:53 AM, Zdenek Wagner <zdenek.wagner at gmail.com> wrote:
>>> 2012/10/30 Michaël Cadilhac <michael at cadilhac.name>:
>>>> Hi there folks,
>>> How about the following solution? I am writing it directly to the mail
>>> without testing, I hope I won't make any error.
>>> \def\vec#1{\do at vec#1_\do at vec}
>>> \def\do at vec#1_#2\do at vec{\ifcat$#2$\mathbf{#1}\else\vec at subscript#1_#2\vec at subscript\fi}
>>> \def\vec at subscript#1_#2_\vec at subscript{\mathbf{#1}_{#2}}
>> Zdeněk,
>> Thanks for your input!  However, I also have vectors such as \vec{x^i_j} (or
>> \vec{x_j^i}), and your solution does not seem to have a simple extension to
>> those cases.  The original hack I had had the advantage that no syntactic
>> manipulation had to be made on the argument, avoiding for sure those
>> problems.  If we have to do this syntactically, I'll think about it some
>> more.
> If the vector is always one letter with optional
> subscripts/superscript, a simpler solution can work:
> \def\vec#1{\do at vec#1\do at vec}
> \def\do at vec#1#2\do at vec{\ifcat$#2$\mathbf{#1}\else\mathbf{#1}#2\fi}
> I am not sure whether math atoms will be properly recognised if the
> second macro is defined just as
> \def\do at vec#1#2\do at vec{\mathbf{#1}\ifcat$#2$\else#2\fi}
>> Thanks again!
>> M.
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