Rank: 917 based on 151 downloads (last 30 days) and 2 files submitted
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Kijoon Lee

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Assistant Professor in Bioengineering


 

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21 Mar 2012 Screenshot Sample Entropy This short code calculates the sample entropy (SampEn) of a given time series data. Author: Kijoon Lee sample entropy, approximate entropy, complexity 91 5
  • 4.42857
4.4 | 8 ratings
20 Mar 2012 Screenshot Fast Approximate Entropy This function calculates Approximate Entropy (ApEn) of a time series data in a very efficient way. Author: Kijoon Lee signal processing, approximate entropy, apen, vectorization 60 5
  • 5.0
5.0 | 3 ratings
Comments and Ratings by Kijoon Lee
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19 May 2012 Fast Approximate Entropy This function calculates Approximate Entropy (ApEn) of a time series data in a very efficient way. Author: Kijoon Lee

Dear Celdor,

The DOI of the paper is 10.1109/MEMB.2009.934629 so you can find it easily.

The first argument, dim, means embedded dimension. That is the length of the sequence to be compared, and typical value for that is 2 or 3.
The second argument, r, is the tolerance for matching. In other words, a pair of values whose difference is smaller than r is considered matching. Typically 0.2*std is used (std means standard deviation of the whole timeseries data), but this paper by Chon suggests that r value should be chosen carefully, and one should look for r value that maximizes the ApEn.

Hope it clears some of your doubts.

-Kijoon

Comments and Ratings on Kijoon Lee's Files View all
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06 Nov 2014 Sample Entropy This short code calculates the sample entropy (SampEn) of a given time series data. Author: Kijoon Lee Hesam

I wrote .c file which is more than two times faster than .m file.
http://www.mathworks.com/matlabcentral/fileexchange/48371-sample-entropy

09 Jul 2014 Sample Entropy This short code calculates the sample entropy (SampEn) of a given time series data. Author: Kijoon Lee Awadhesh Ranjan

18 Feb 2014 Sample Entropy This short code calculates the sample entropy (SampEn) of a given time series data. Author: Kijoon Lee zhou wei

08 Nov 2013 Sample Entropy This short code calculates the sample entropy (SampEn) of a given time series data. Author: Kijoon Lee Liang ZOU

06 May 2013 Fast Approximate Entropy This function calculates Approximate Entropy (ApEn) of a time series data in a very efficient way. Author: Kijoon Lee John

I am interested in using this method to calculate approximate entropy for a boids model.
Can anyone suggest how I can complete the calculation for a specified number of boids in two dimensional space?

(I have txt files with lists of integer values for x and y co-ordinates.

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