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in fact I want to have a good expression form. In the code below, when you compile it, the arrow isn't on the full term and also the exp is bigger than the H_x or H_y term ? How can I enhance the form of the expression

\documentclass[review]{elsarticle}
\DeclareGraphicsExtensions{.pdf,.gif,.jpg}

\usepackage{lineno}
\modulolinenumbers[5]
\usepackage{graphicx}
\usepackage{amssymb,amsmath,nccmath}
\usepackage{cclicenses}
\usepackage{makecell}
%%\usepackage{caption} % is loaded automatically by 'subcaption'
\usepackage{lscape,array}
\newcolumntype{C}[1]{>{\centering\arraybackslash}p{#1}} % centered 'p' col.
%%\usepackage{natbib} % is loaded automatically by elsarticle doc class
\usepackage{subcaption}
\usepackage{caption}
\usepackage{framed}  % Framing content
\usepackage{nomencl} % Nomenclature package
\usepackage[font=small,skip=0pt]{caption}
\makenomenclature
\setlength{\nomitemsep}{-\parskip}\usepackage{booktabs,multirow}
\renewcommand{\cellset}{\renewcommand{\arraystretch}{0.5}}

%% Load the next two packages *last*:
\usepackage[colorlinks]{hyperref}
\usepackage[nameinlink]{cleveref}

\journal{Journal of \LaTeX\ Templates}

\bibliographystyle{elsarticle-num}

\begin{document}
blablablablablablablabla
$\vec{V}_x$=$\frac{H_z}{3}$$\exp(jK)$  \: \: $\vec{V}_y$=$\frac{H_z}
{3}$$\exp(jm)$
\end[document}
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  • Instead of \vec there is \overrightarrow, but I think it looks ugly in this context (you almost need \overrightarrow{V}_{\!\!x} to correct for the subscript placement). To make fractions all of same size, there is \dfrac; however, that destroys the natural line spacing for inline math, such as you have provided. Nov 3 '17 at 19:50
  • 3
    please next time try to make a more minimal example, you could delete almost all of the packages here as they are unrelated to the question. Also you can not possibly get correct math typesetting if you do $x$=$y$ instead of the far more natural $x=y$ why are you setting the = in text mode and not in math mode? Nov 3 '17 at 19:54
  • What does = provides in math mode ??
    – twimo
    Nov 3 '17 at 19:57
  • 2
    @twimo "fast typing" isn't really an excuse, it means you didn't test the code before posting it (and you can still edit the question to fix it) Nov 3 '17 at 20:09
  • 1
    I am not sure what you mean by your question about = surely equality is the most canonical math operator, it should be set in math mode, using the math fonts, but you were setting it in text mode (which might sometimes accidentally use the correct font, but will never give it the correct spacing) Nov 3 '17 at 20:15
2

The cramped form is forced by the markup used, if you mark up the math expressions as intended you get more space, you can also use an expanding over-arrow and \dfrac to get display style fractions, but really such an expression is too tall to be set in inline math and looks better set in display math style as in the final version.

enter image description here

\documentclass{article}

\usepackage{amsmath}


\begin{document}
blablablablablablablabla
$\vec{V}_x$=$\frac{H_z}{3}$$\exp(jK)$  \: \: $\vec{V}_y$=$\frac{H_z}
{3}$$\exp(jm)$

\bigskip

blablablablablablablabla
$\vec{V}_x=\frac{H_z}{3}\exp(jK)$   \quad $\vec{V}_y=\frac{H_z}{3}\exp(jm)$

\bigskip

blablablablablablablabla
\renewcommand\vec[1]{\overrightarrow{#1}}
$\vec{V}_x=\frac{H_z}{3}\exp(jK)$   \quad $\vec{V}_y=\frac{H_z}{3}\exp(jm)$

\bigskip

blablablablablablablabla
\renewcommand\vec[1]{\overrightarrow{#1}}
$\vec{V}_x=\dfrac{H_z}{3}\exp(jK)$   \quad $\vec{V}_y=\dfrac{H_z}{3}\exp(jm)$

\bigskip

blablablablablablablabla
\renewcommand\vec[1]{\overrightarrow{#1}}
\[\vec{V}_x=\frac{H_z}{3}\exp(jK)  \qquad \vec{V}_y=\frac{H_z}{3}\exp(jm)\]

\end{document}
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2

I propose to use the esvect package, which defines 8 arrow tips for extensible arrows, and takes care of vectors with subscript, and the \mfrac command from nccmath. I took the opportunity to simplify your code: why does each element of a formula have its own pair of $?

\documentclass[review]{elsarticle}

\usepackage{amssymb, amsmath, nccmath}
\usepackage[b]{esvect}

\begin{document}

blablablablablablablabla\enspace 
$\vv*{V}{x} = \mfrac{H_z}{3}\exp(jK)$ \: \: $\vv*{V}{y} = \mfrac{H_z}
{3}\exp(jm)$

\end{document} 

enter image description here

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