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I am trying to get stacked indices using subarray/substack using the following snippet, but I am not seeing stacking beneath the sum symbol. This is the type of output I am expecting, good output

but this is what I am getting:

bad output

Here is the code:

\documentclass{report}
\usepackage{amsmath, amsfonts, amssymb}
\begin{document}
    \[
          \frac{\sum_{\begin{subarray}{l}\forall x \\
          \mathcal{D}(x)=\mathcal{D}_i\end{subarray}} \sum_{\substack{\forall
              y\in\Omega(x) \\
   \mathcal{D}(y)=\mathcal{D}_j}} 1}
    {\sum_{\forall x }\mathcal{D}(x)}
   \]
\end{document}

What should I do to get proper stacking?

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2  
So you are after output that resembles this? Issue \displaystyle in the numerator and denominator of \frac. –  Werner Aug 25 at 17:39
    
@werner, thanks. wish it's possible to accept a solution in a comment too :) –  Jey Aug 25 at 18:16

1 Answer 1

up vote 3 down vote accepted

You need to add the directive \displaystyle at the start of both the numerator and denominator. I would also add \, (thinspace) between the two main terms in the numerator.

enter image description here

\documentclass{report}
\usepackage{amsmath, amsfonts, amssymb}
\begin{document}
\[
   \frac{\displaystyle\sum_{\begin{subarray}{l}\forall x \\
                             \mathcal{D}(x)=\mathcal{D}_i\end{subarray}}  \, 
      \sum_{\substack{\forall y\in\Omega(x) \\ \mathcal{D}(y)=\mathcal{D}_j}} 1}
   {\displaystyle\sum_{\forall x }\mathcal{D}(x)}
\]
\end{document}

For more on this subject, you may want to consult the posting Fractions with large elements.

share|improve this answer
    
Or \limits, but perhaps in this case \displaystyle is better. –  egreg Aug 25 at 18:04
    
@Mico, it worked!! –  Jey Aug 25 at 18:15

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