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I want to use sum in a fraction, but it doesn't like it should. Here's my code:

\begin{equation}
    \rho=\sum_{I=1}^{N}y_I
\end{equation}

\begin{equation}
    \rho=\frac{\sum_{I=1}^{N}y_I}{\sum_{I=1}^{N}x_I}
\end{equation}

As a reference I've added two images below. one with sum, as it should look, and the other one as a fraction.

enter image description here

I want the sum in \frac{}{} to like it does in a normal equation, that is, the sum range at top and bottom.

I have no idea how to implement that. Could anyone please help me?

barbara beeton
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Xu Hui
  • 111
  • 2
    One option is to use \limits: \rho=\frac{\sum\limits_{I=1}^{N}y_I}{\sum\limits_{I=1}^{N}x_I}. –  Nov 21 '20 at 06:23
  • Keep it like it is. TeX does this for a reason. Having two full-size summations in enumerator and denominator looks terrible. – Gaussler Nov 21 '20 at 16:33

0 Answers0