3

I have a problem with splitting this long equation . i tried aligned env and split of amsmath package but nothing worked !! Any help .

 $ Sym_{vertical} =  \frac { \mid X^{'}_{UL} - X^{'}_{UR}\mid 
+ \mid X^{'}_{LL} - X^{'}_{LR}\mid 
+ \mid Y^{'}_{UL} - Y^{'}_{UR}\mid             \\  
+\mid Y^{'}_{LL} - Y^{'}_{LR} \mid 
+ \mid H^{'}_{UL} - X^{'}_{UR} \mid 
+ \mid H^{'}_{LL} - H^{'}_{LR} \mid  \\
+\mid B^{'}_{UL} - B^{'}_{UR} \mid 
+ \mid B^{'}_{LL} - B^{'}_{LR} \mid 
+ \mid \Theta^{'}_{UL} - \Theta^{'}_{UR} \mid  \\
+ \mid \Theta^{'}_{LL} - \Theta^{'}_{LR} \mid 
+ \mid R^{'}_{UL} - R^{'}_{UR} \mid 
+ \mid R^{'}_{LL} - R^{'}_{LR} \mid}
{12}$ 

i want it to look this way :enter image description here

1
  • 6
    12 SYM_{\mathrm{horizontal}} = ... Apr 24 '17 at 15:08
5

I made the numerator a left-aligned \Longstack (in math mode). I also had to change a few \\+ to +\\ and made the left side of the equation in \mathrm.

Mico was right to point out that \mids should be replaced with \lvert, \rvert pairs, and ^{'} is redundant and should be just employed as '.

\documentclass{article}
\usepackage[usestackEOL]{stackengine}
\usepackage{amsmath}
\stackMath
\begin{document}
\[
\mathrm{Sym}_\mathrm{vertical} =  \frac 
{ \Longstack[l]{\lvert X'_{UL} - X'_{UR}\rvert 
+ \lvert X'_{LL} - X'_{LR}\rvert 
+ \lvert Y'_{UL} - Y'_{UR}\rvert             +\\  
\lvert Y'_{LL} - Y'_{LR} \rvert 
+ \lvert H'_{UL} - X'_{UR} \rvert 
+ \lvert H'_{LL} - H'_{LR} \rvert  +\\
\lvert B'_{UL} - B'_{UR} \rvert 
+ \lvert B'_{LL} - B'_{LR} \rvert 
+ \lvert \Theta'_{UL} - \Theta'_{UR} \rvert  +\\
 \lvert \Theta'_{LL} - \Theta'_{LR} \rvert 
+ \lvert R'_{UL} - R'_{UR} \rvert 
+ \lvert R'_{LL} - R'_{LR} \rvert}}
{12}
\]

\end{document}

enter image description here

If term alignment is useful, the a TABstack can be used, instead.

\documentclass{article}
\usepackage{tabstackengine}
\usepackage{amsmath}
\stackMath
\begin{document}
\[
\TABbinary
\mathrm{Sym}_\mathrm{vertical} =  \frac 
{ \tabbedLongstack[l]{\lvert X'_{UL} - X'_{UR}\rvert 
&+ \lvert X'_{LL} - X'_{LR}\rvert 
&+ \lvert Y'_{UL} - Y'_{UR}\rvert            & +\\  
\lvert Y'_{LL} - Y'_{LR} \rvert 
&+ \lvert H'_{UL} - X'_{UR} \rvert 
&+ \lvert H'_{LL} - H'_{LR} \rvert  &+\\
\lvert B'_{UL} - B'_{UR} \rvert 
&+ \lvert B'_{LL} - B'_{LR} \rvert 
&+ \lvert \Theta'_{UL} - \Theta'_{UR} \rvert  &+\\
 \lvert \Theta'_{LL} - \Theta'_{LR} \rvert 
&+ \lvert R'_{UL} - R'_{UR} \rvert 
&+ \lvert R'_{LL} - R'_{LR} \rvert&}}
{12}
\]

\end{document}

enter image description here

0
10

The mathtools package provides the macros \splitfrac and \splitdfrac for just your use case. You may prefer the solution with either four or three split lines.

enter image description here

\documentclass{article}
\usepackage{mathtools}
\DeclarePairedDelimiter{\abs}{\lvert}{\rvert}
\begin{document}
\[ \textit{Sym}_{\mathrm{vertical}} =  
\frac {% 
\splitdfrac{\abs{X'_{UL} - X'_{UR}}
+ \abs{X'_{LL} - X'_{LR}}
+ \abs{Y'_{UL} - Y'_{UR}}}{%  
\splitdfrac{{}+ \abs{Y'_{LL} - Y'_{LR}}
+ \abs{H'_{UL} - X'_{UR}}
+ \abs{H'_{LL} - H'_{LR}}}{%
\splitdfrac{{}+ \abs{B'_{UL} - B'_{UR}}
+ \abs{B'_{LL} - B'_{LR}}
+ \abs{\Theta'_{UL} - \Theta'_{UR}}}{%
+ \abs{\Theta'_{LL} - \Theta'_{LR}}
+ \abs{R'_{UL} - R'_{UR}}
+ \abs{R'_{LL} - R'_{LR}} }}} }
{12}
\] 

\begin{multline*}
\textit{Sym}_{\mathrm{vertical}} =  \\
\frac {% 
\splitdfrac{
  \abs{X'_{UL} - X'_{UR}}+ \abs{X'_{LL} - X'_{LR}}
+ \abs{Y'_{UL} - Y'_{UR}}+ \abs{Y'_{LL} - Y'_{LR}}}{%  
\splitdfrac{{}
+ \abs{H'_{UL} - X'_{UR}}+ \abs{H'_{LL} - H'_{LR}}
+ \abs{B'_{UL} - B'_{UR}}+ \abs{B'_{LL} - B'_{LR}}}{%  
+ \abs{\Theta'_{UL} - \Theta'_{UR}} + \abs{\Theta'_{LL} - \Theta'_{LR}}
+ \abs{R'_{UL} - R'_{UR}} + \abs{R'_{LL} - R'_{LR}} }}}
{12}
\end{multline*}
\end{document} 
10

Use a fraction in front of the expression:

\documentclass{article}

\usepackage{mathtools}
\DeclarePairedDelimiter{\abs}{\lvert}{\rvert}

\begin{document}
\[
\mathit{Sym}_{\mathrm{vertical}} =
\tfrac{1}{12}(\,
  \begin{alignedat}[t]{3}
  & \abs{ X'_{UL} - X'_{UR} } &&+ \abs{ X'_{LL} - X'_{LR} } &&+ {}\\
  & \abs{ Y'_{UL} - Y'_{UR} } &&+ \abs{ Y'_{LL} - Y'_{LR} } &&+ {}\\
  & \abs{ H'_{UL} - X'_{UR} } &&+ \abs{ H'_{LL} - H'_{LR} } &&+ {}\\
  & \abs{ B'_{UL} - B'_{UR} } &&+ \abs{ B'_{LL} - B'_{LR} } &&+ {}\\
  & \abs{ \Theta'_{UL} - \Theta'_{UR}  } &&+ \abs{ \Theta'_{LL} - \Theta'_{LR} } &&+ {}\\
  & \abs{ R'_{UL} - R'_{UR} } &&+ \abs{ R'_{LL} - R'_{LR} }\,)
\end{alignedat}
\]
\end{document}

enter image description here

An alternative with the plus signs at the left side.

\documentclass{article}

\usepackage{mathtools}
\DeclarePairedDelimiter{\abs}{\lvert}{\rvert}

\begin{document}
\[
\begin{split}
\mathit{Sym}_{\mathrm{vertical}} = 
\tfrac{1}{12}(\,
  &  \abs{ X'_{UL} - X'_{UR} } + \abs{ X'_{LL} - X'_{LR} } \\
  &+ \abs{ Y'_{UL} - Y'_{UR} } + \abs{ Y'_{LL} - Y'_{LR} } \\
  &+ \abs{ H'_{UL} - X'_{UR} } + \abs{ H'_{LL} - H'_{LR} } \\
  &+ \abs{ B'_{UL} - B'_{UR} } + \abs{ B'_{LL} - B'_{LR} } \\
  &+ \abs{ \Theta'_{UL} - \Theta'_{UR}  } + \abs{ \Theta'_{LL} - \Theta'_{LR} } \\
  &+ \abs{ R'_{UL} - R'_{UR} } + \abs{ R'_{LL} - R'_{LR} }\,)
\end{split}
\]
\end{document}

enter image description here

2
  • other than it's how the op showed it, why would you not place the plus signs at the beginning of the continuation lines? Apr 24 '17 at 18:21
  • @barbarabeeton That's a possible choice, I'll add it: your wish is my command, as you know.
    – egreg
    Apr 24 '17 at 19:42

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