RECURRENCE PLOTS

Hi,

you have to use the 'nonorm' option in the crp-function, e.g., Best wishes
Norbert

We are organizing a Minisymposium on Recurrence Plots at the conference "Perspectives in Nonlinear Dynamics" (PNLD2016) in Berlin, July 24th–29th, 2016. The programm is now online: http://pnld2016.physik.hu-berlin.de/node/21

Hi David, thanks for the bug report. Yes, you are completely right. This code was not used so much, therefore I missed to include this "normalization" option in this function (although in the help text it is stated that this would work). I have now fixed this problem (R30.5). crqad allows ...

It is the most simple one. This means, an simple ASCII file with a column of numbers (or several columns).

Thanks for the hint. I will add a remark on the website.

I would be careful when using embedding. Do not overembed because it will cause artefacts (spurious correlations in the RP and artificially many long lines). Therefore, I would probably use a low embedding dimension and delay for all channels (e.g., m=3, tau = 2). Final values depend on the data. It...

(reply refers to the CRP Toolbox) It depends on the selected recurrence criterion. When it is a fixed size of the neighbourhood, such for EUC, MAX, MIN, then it is the absolute value of ε. But there are also "dynamical thresholds", such as selecting the fixed amount of nearest neighbours (...

Maybe let's start with the definition of the RP: Θ(ε–|| x ( i ) – x ( j )|| The threshold ε is just a scalar value. Its choice is somehow related to the value range of the time series or the diameter of the phase space. One way to relate ε to this value range or diameter is to have it as a certain f...

The seventh international recurrence plot symposium will be at the Escola Politecnica (Universidade de Sao Paulo) in Sao Paulo, Brazil, in August 23-25, 2017.

More information:
http://symposium.recurrence-plot.tk/

viniciusjdv wrote:Prof,

How can I use the crqa routine to extract the RQA measures based on a fixed recurrence rate (e.g. RR=5%)?

Simply using:

1) Is this threshold parameter an absolute value of the radius or a percentage value of the maximum diameter of the phase space? Yes, it is an absolute value. 2) Is there a way to vary the parameter m and t? I mean, instead of using "-m 3 -t 7", … Yes, you can do it. You have to use eithe...

Hello,
cold you please post a screenshot and further details about your operatin system?
Thanks!
Norbert

In this case (tangential motion close to the LOI) you just need to apply the Theiler window. The CRP toolbox has such an option. Just look in the help of the crp and crqa functions.

Hi David, yes, Stefan's solution on the Humboldt university website is different. It relates to this paper: S. Schinkel, N. Marwan, O. Dimigen, J. Kurths: Confidence bounds of recurrence-based complexity measures, Physics Letters A, 373(26), 2245–2250 (2009). DOI:10.1016/j.physleta.2009.04.045 For t...

Hi, your solution looks correct. Perhaps the used time window is too small. You can add another argument that specifies the time window (i.e. the maximal time range that will be considered by this method). If you need the p(tau) separately, you can calculate them by the crqad function: y = crqad(tim...

I post here a MATLAB coding example that was developed within the hands-on session of the 6th RP symposium in Grenoble. It allows a windowed recurrence analysis with changing parameters for each window. %% Sample code to apply a windowing recurrence analysis with CRP Toolbox for MATLAB % Allows to c...