# real world example

• January 9th 2012, 12:45 PM
delgeezee
real world example of log
What is a real world example of a logarithm?
• January 9th 2012, 01:03 PM
chisigma
Re: real world example of log
Quote:

Originally Posted by delgeezee
What is a real world example of a log function?

A basic concept in Information Theory is the Entropy os a random variable. Given a random variable X with alphabet $\chi= \{1,2,...,m\}$ , the the Entropy of X is ...

$H(X)= - \sum_{x \in \chi} p(x)\ \ln p(x)$ (1)

... where $p(x)=P\{X=x\}$...

Kind regards

$\chi$ $\sigma$
• January 9th 2012, 01:06 PM
Charney
Re: real world example of log
Google is your friend. As it turns out, Wikipedia is packed full of valid real-world applications of logarithms. See this link.