Search found 194 matches

by Norbert
Wed Jul 13, 2016 07:39
Forum: General Discussion
Topic: Threshold and Attractor diameter
Replies: 1
Views: 13966

Re: Threshold and Attractor diameter

(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 (...
by Norbert
Wed Jul 13, 2016 07:25
Forum: General Discussion
Topic: radius threshold
Replies: 2
Views: 15681

Re: radius threshold

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...
by Norbert
Mon Nov 16, 2015 10:23
Forum: Recurrence Plot Symposium
Topic: 7th Recurrence Plot Symposium in Brazil
Replies: 0
Views: 22042

7th Recurrence Plot Symposium in Brazil

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/
by Norbert
Mon Nov 16, 2015 10:21
Forum: Available Software
Topic: Downloading the crp toolbox
Replies: 3
Views: 16014

Re: Downloading the crp toolbox

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:

Code: Select all

crqa(data,m,tau,0.05,'rr')
by Norbert
Mon Nov 16, 2015 10:20
Forum: Available Software
Topic: Commandline Recurrence Plots
Replies: 4
Views: 18823

Re: Commandline Recurrence Plots

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...
by Norbert
Fri Sep 25, 2015 12:33
Forum: Bugs
Topic: Displayed fonts problem
Replies: 1
Views: 11915

Re: Displayed fonts problem

Hello,
cold you please post a screenshot and further details about your operatin system?
Thanks!
Norbert
by Norbert
Sat Aug 22, 2015 11:09
Forum: General Discussion
Topic: Calculating perpendicular RP
Replies: 1
Views: 14460

Re: Calculating perpendicular RP

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.
by Norbert
Tue Jul 7, 2015 21:42
Forum: General Discussion
Topic: Confidence Intervals for RP-measures
Replies: 1
Views: 13279

Re: Confidence Intervals for RP-measures

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...
by Norbert
Tue Jul 7, 2015 21:37
Forum: General Discussion
Topic: correlation using probability of recurrence
Replies: 1
Views: 13083

Re: correlation using probability of recurrence

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...
by Norbert
Tue Jul 7, 2015 21:27
Forum: Quantification
Topic: Sample code to apply a windowing recurrence analysis with CR
Replies: 0
Views: 21270

Sample code to apply a windowing recurrence analysis with CR

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...
by Norbert
Tue Jun 23, 2015 15:17
Forum: General Discussion
Topic: Email list
Replies: 0
Views: 22517

Email list

We have created a Google groups based email list: https://groups.google.com/forum/?#!forum/recurrenceanalysis . Feel free to join in order to be updated on everything around recurrence based time series analysis. Alternatively, you can follow new about recurrence plot on Twitter: https://twitter.com...
by Norbert
Tue Jun 23, 2015 15:07
Forum: Recurrence Plot Symposium
Topic: next workshop
Replies: 2
Views: 16117

Re: next workshop

The 2017 RP symposium will probably be in Brazil. Keep in touch to be informed!
Norbert
by Norbert
Wed Mar 18, 2015 07:19
Forum: Recurrence Plot Symposium
Topic: 6th Recurrence Plot Symposium in Grenoble
Replies: 0
Views: 21913

6th Recurrence Plot Symposium in Grenoble

The sixth international recurrence plot symposium will be in Grenoble, France, in June 2015.

More information:
http://symposium.recurrence-plot.tk/
by Norbert
Fri Mar 6, 2015 14:44
Forum: Multivariate Extensions and Spatial Data
Topic: Non-Time series data analysis
Replies: 2
Views: 13526

Re: Non-Time series data analysis

Hello I have no idea what you are really would like to do. But perhaps the ACE algorithm is something what you are looking for? Although it is not related to recurrence plots, it is included in the CRP toolbox for Matlab. Standalone version can be found here: http://tocsy.pik-potsdam.de/ace.php Best...
by Norbert
Thu Dec 11, 2014 07:01
Forum: General Discussion
Topic: JRP between binary and continuous time series
Replies: 2
Views: 15420

Re: JRP between binary and continuous time series

Hi David, thanks for this interesting example that is a quite challenging one, in my opinion. First, you are right to try to use the JRP. However, in my opinion the binary data requires an alternative recurrence criterion. As a start, you can try to do it as you started. The dense region at the bott...