【569】LaTex, arrows over letters

　　There are two ways to implement this effect.

1. \overleftarrow, \overrightarrow

　　This method is easy to use, but it always makes a big spacing between two lines and different letters.

2. \vec

　　This method can create a small right arrow, but it cannot generate the left arrow over letters

3. improved method

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1 2	\usepackage{graphicx} \newcommand{\cev}[1]{\reflectbox{\ensuremath{\vec{\reflectbox{\ensuremath{#1}}}}}}

　　Then use \cev to create a small left arrow

 

　　An example is illustrated here.

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\documentclass{article} \usepackage{graphicx} \newcommand{\cev}[1]{\reflectbox{\ensuremath{\vec{\reflectbox{\ensuremath{#1}}}}}} \begin{document} \[ h_t = [\overrightarrow{h}_t, \overleftarrow{h}_t], [\vec{h}_t, \cev{h}_t] \] \end{document}