widehat incompatibility?

[andjorhanson]

Hi - I use \widehat and I also use my own bold "\Hat" macro defined as

%% \newcommand{\Hat}[1]{\hat{\bf #1}}
\renewcommand{\Hat}[1]{\hat{\bf #1}}

%% \newcommand{\Vec}[1]{{\bf #1}}
\renewcommand{\Vec}[1]{{\bf #1}}

\widehat works fine on all kinds of arguments, BUT when I use it this way

R(\theta, \Hat{n}) = R(\arccos{(\Hat{x}\cdot \Hat{y}) }, \widehat{\Hat{x}\times \Hat{y}} )

it WILL NOT COMPILE, always getting this error:

---

Underfull \hbox (badness 10000) in paragraph at lines 26--27
[83] <img2/2DMatch-a.eps> [84] [85]
./chapter2DRMSD.tex:268: Undefined control sequence.
\macc@adjust ->\dimen@ \macc@kerna
\advance \dimen@ \macc@kernb \kern -\dimen@
l.268 ...at{y}) }, \widehat{\Hat{x}\times \Hat{y}}
) \ ,
? r
OK, entering \nonstopmode.

However, if I PRECEDE it with \compositeaccents, as I must for \wideparen,
then it is fine:

\begin{equation} %
% R(\theta, \Hat{n}) = R(\arccos{(\Hat{x}\cdot \Hat{y}) }, \widehat{\Hat{x}\times \Hat{y}} )
R(\theta, \Hat{n}) = \times R(\arccos{(\Hat{x}\cdot \Hat{u} )},
\compositeaccents\widehat{\Hat{x} \times \Hat{u}} )
\label{Just2DRot.eq}
\end{equation}

The crazy thing is that this always worked without the \compositeaccents until
YESTERDAY, when I tried to compile the WHOLE book for the first time in
a month (getting close to submission!). Did something change in a LaTeX or
TeXShop update that broke \widehat? This ALWAYS worked, for years...

Or is my \Hat macro suddenly illegal as of yesterday? Should I change the
\Hat and \Vec macros ???

Thanks, Andy

[dgalcius]

Hi,
{yhmath} package redefines \widehat macro. With this version you have to use \compositeaccents with \widehat.
Alternatively, you could use unaltered version of \widehat: put \let\owidehat\widehat before loading {yhmath} and then use \owidehat instead of \widehat. Hope it helps, - deimi