Search found 175 matches

by Norbert
Thu Jan 5, 2017 11:52
Forum: Installation
Topic: Fail to install.
Replies: 5
Views: 10784

Re: Fail to install.

It is better to send me an email with all information I would need to figure out the problem. (MATLAB version, operation system etc)
Thanks!
NM
by Norbert
Wed Dec 21, 2016 11:00
Forum: Available Software
Topic: Questions about multi-column input X in function crqa
Replies: 1
Views: 3525

Re: Questions about multi-column input X in function crqa

Hello Fan.Mi, thanks for your kind words. Regarding your question: it is something different when you calculate the RQA for each of the N channels separately or when you combine all N channels to one phase space trajectory (of then dimension N ), because then you get only one RQA result. It depends ...
by Norbert
Tue Oct 25, 2016 07:40
Forum: General Discussion
Topic: CRP toolbox for more than two time series
Replies: 4
Views: 5546

Re: CRP toolbox for more than two time series

univariate means you analyse only one time series bivariate means you analyse two time series, e.g., correlation multivariate means you analyse more than one time series, usually more than two in your case, i guess you simply compare two time series, but all available pairs. your problem looks quit...
by Norbert
Tue Oct 18, 2016 07:24
Forum: General Discussion
Topic: CRP toolbox for more than two time series
Replies: 4
Views: 5546

Re: CRP toolbox for more than two time series

Hi,

no, you can only compare two time series with a CRP. But what is your research question? I guess that a bivariate test is mostly sufficient.

Best
Norbert
by Norbert
Fri Oct 14, 2016 17:44
Forum: Available Software
Topic: Windows application to draw recurrence plots
Replies: 2
Views: 4576

Re: Windows application to draw recurrence plots

Hi Migul, great! Thanks for sharing the software and the code! I'm sure there are scientists who would like to use it. Perhaps you could add some instructions how to use the software and how to compile the source code and some note about the requirements to use the software (Win10?, 64bit?). I haven...
by Norbert
Wed Oct 12, 2016 05:55
Forum: General Discussion
Topic: Theiler window
Replies: 1
Views: 3683

Re: Theiler window

Hi Marina, the Theiler window corrects only the recurrences that are close to the reference point. All other, "futher away" points are not corrected. For a RP it means that the Theiler window is a small band along the main diagonal. Therefore, it will only partly affect the LAM measure. Bes regards ...
by Norbert
Mon Aug 29, 2016 14:47
Forum: General Discussion
Topic: CRP Toolbox for Visual Fixations - Set Threshold?
Replies: 1
Views: 3428

Re: CRP Toolbox for Visual Fixations - Set Threshold?

Hi,

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

Code: Select all

r = crp2(data,m,tau,10,'nonorm');
Best wishes
Norbert
by Norbert
Wed Jul 13, 2016 08:17
Forum: Recurrence Plot Workshop
Topic: Minisymposium on Recurrence Plots at the PNLD2016
Replies: 0
Views: 4107

Minisymposium on Recurrence Plots at the PNLD2016

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
by Norbert
Wed Jul 13, 2016 08:14
Forum: Bugs
Topic: Bug in Crqad.m
Replies: 1
Views: 3583

Re: Bug in Crqad.m

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 to select ...
by Norbert
Wed Jul 13, 2016 07:55
Forum: Available Software
Topic: Data file types for recurrence-plot.tk's online calculator
Replies: 1
Views: 2970

Re: Data file types for recurrence-plot.tk's online calculat

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.
by Norbert
Wed Jul 13, 2016 07:45
Forum: Applications
Topic: EEG
Replies: 11
Views: 33502

Re: EEG

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...
by Norbert
Wed Jul 13, 2016 07:39
Forum: General Discussion
Topic: Threshold and Attractor diameter
Replies: 1
Views: 3837

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 (FAN) or fi...
by Norbert
Wed Jul 13, 2016 07:25
Forum: General Discussion
Topic: radius threshold
Replies: 2
Views: 4906

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 Workshop
Topic: 7th Recurrence Plot Symposium in Brazil
Replies: 0
Views: 4034

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: 6395

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')