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How can I make a subscript for sum in latex like the following picture:

enter image description here

I tried \sum_{q_i} but that doesn't make the result I want. It makes the following result: enter image description here

Torbjørn T.
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Jack Twain
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  • Why not? (You did write this in math mode, right?) – Thomas Aug 08 '13 at 18:29
  • yes in math mode. I included a pic for the result –  Aug 08 '13 at 18:31
  • Welcome to TeX.SX! Your post was migrated here from [so]. Please register on this site, too, and make sure that both accounts are associated with each other (by using the same OpenID), otherwise you won't be able to comment on or accept answers or edit your question. – Torbjørn T. Aug 09 '13 at 11:21
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    Related: http://tex.stackexchange.com/questions/32824/show-inline-math-as-if-it-were-display-math/32827#32827 – Torbjørn T. Aug 09 '13 at 11:24
  • The proposed duplicate is for the reverse direction. – percusse Aug 09 '13 at 11:46
  • So are you trying to get the inline math style in display math? (See Martin's answer). If so would \\ $\sum_{q_i} {p x r}$ \\ be any good? – Chris H Aug 09 '13 at 12:10
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    @ChrisH Don't do that please, rather use \textstyle in \[ .. \] (or some other displayed environment). – Torbjørn T. Aug 09 '13 at 12:26
  • @TorbjørnT. Thank you. I think \textstyle (which I should have heard of, but didn't remember - I rarely use display math) is actually the answer to the original question. – Chris H Aug 09 '13 at 12:29
  • to get your desired results use

    [\sum_{X_1}]

    or

    $\sum\limits_{X_1}$

     – itfeature.com Aug 11 '13 at 15:17

2 Answers2

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That is expected; it's a matter of inline math mode versus display math mode.

Inline math is meant for small fragments inside the running text, so it is typeset in a compact way, with the subscript to the side of the sum symbol. Inline math is done with $...$.

Display math is meant for larger, standalone equations, and is set in a paragraph of its own. Because it has more space, the subscript can be put underneath the sum symbol. Display math is done with \[...\] or a whole variety of environments.

Thomas
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I tried it out rightnow. If you write something like

  \begin{equation}
  \sum_{q_i} {p x r}
  \end{equation}

It should give you the result you do not want to have, but if you enter mathmode in text

 I want to show you this sum $\sum_{q_i} {p x r}$ blabla

Then you would get theresult you want to have.

mjhalwa
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