CRP Toolbox Reference

rpde

Purpose

Computes the recurrence time entropy.

Syntax

    y=rpde(x)
    y=rpde(x,...)

Description

y=rpde(x) calculates the normalised entropy y of the recurrence time distribution of time series x, also known as recurrence period density entropy (RPDE).

Note

In contrast to the calculation of RPDE here, in crqa a Theiler window is applied to the RP by default, resulting in different RPDE values. For comparison, you should ensure that the Theiler window in crqa is set to 0.

Examples

    a=sin(0:.1:80);
    b=sin(0:.1:80) + 0.1 * randn(1,801);
    rpde(a,3,15,.1)
    rpde(b,3,15,.1)

See Also

crqa, tt

References

Little, M., McSharry, P., Roberts, S., Costello, D., Moroz, I.: Exploiting Nonlinear Recurrence and Fractal Scaling Properties for Voice Disorder Detection, Biomed. Eng. Online, 6, 2007.


recons rrspec