Typesetting LaTeX fraction terms to be larger in an equation
I have the following formula in LaTeX, based on Fisher's Exact Test. (NOTE: requires the use of the amsmath
package for \binom
.)
\begin{equation}
P(i,j) = \sum_{x=|N(V_i) \cap V_j|}^{\min\{|V_j|, |N(V_i)|}
\frac{ \binom{|V_j|}{x} \binom{|V - V_j|}{|N(V_i)| - x}}
{\binom{|V|开发者_JAVA技巧}{|N(V_i)|}}
\end{equation}
This renders the fraction portion with very small, difficult to read text:
I would like my text more readable, as in the following example:
(source: plosone.org)What trickery can I use to get LaTeX to render my equation similarly?
This may be what you're looking for:
\begin{equation}
P(i,j) = \sum_{x=|N(V_i) \cap V_j|}^{\min\{|V_j|, |N(V_i)|}
\frac{\displaystyle \binom{|V_j|}{x} \binom{|V - V_j|}{|N(V_i)| - x}}
{\displaystyle \binom{|V|}{|N(V_i)|}}
\end{equation}
Thought it might be good to add a reference:
A Guide to LaTeX2e, Kopka & Daly, 1995
Section 5.5 Fine-Tuning Mathematics
5.5.2 Selecting font size in formulas
In my edition, it's on pp 141-142, but this is out of stock on Amazon. The nearest Internet pointer I can find just now is here
For fraction you can also use continued fraction \cfrac
in combination with \left
and \right
.
Take a look here.
Here's one idea.
In Preamble:
\def\mathLarge#1{\mbox{\LARGE $#1$}}
Then update your equation to:
\begin{equation}
P(i,j) = \sum_{x=|N(V_i) \cap V_j|}^{\min\{|V_j|, |N(V_i)|}
\mathLarge{
\frac{ \binom{|V_j|}{x} \binom{|V - V_j|}{|N(V_i)| - x}}
{\binom{|V|}{|N(V_i)|}}
}
\end{equation}
Results in:
The following lines define three fraction commands with sizes intermediate between \displaystyle and \textstyle, in order of decreasing size:
\newcommand{\sdfrac}[2]{\mbox{\small$\displaystyle\frac{#1}{#2}$}}
\newcommand{\fdfrac}[2]{\mbox{\footnotesize$\displaystyle\frac{#1}{#2}$}}
\newcommand{\ltfrac}[2]{\mbox{\large$\frac{#1}{#2}$}}
See this page if further explanation is needed.
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