\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:
\documentclass{minimal}
\renewcommand{\vec}[1]{\mathbf #1}
\newcommand{\hallo}{hallo}
\begin{document}
\[\vec{x_1} \qquad \vec{\hallo_1} \qquad \vec{x^1} \qquad \vec{\hallo^1}\]
\end{document}
ciao
Tobias
On 31.10.2012 01:16, Zdenek Wagner wrote:
2012/10/30 Michaël Cadilhac <mich...@cadilhac.name>:On Tue, Oct 30, 2012 at 10:53 AM, Zdenek Wagner <zdenek.wag...@gmail.com> wrote:2012/10/30 Michaël Cadilhac <mich...@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@vec#1_\do@vec} \def\do@vec#1_#2\do@vec{\ifcat$#2$\mathbf{#1}\else\vec@subscript#1_#2\vec@subscript\fi} \def\vec@subscript#1_#2_\vec@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@vec#1\do@vec} \def\do@vec#1#2\do@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@vec#1#2\do@vec{\mathbf{#1}\ifcat$#2$\else#2\fi}Thanks again! M. -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
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