Search found 194 matches

by Norbert
Thu Sep 7, 2017 09:36
Forum: Bugs
Topic: nargoutchk: Not enough input arguments
Replies: 1
Views: 11252

Re: nargoutchk: Not enough input arguments

Hi, I think nargoutchk was introduced before MATLAB R2006a. But it seems that your MATLAB is too old and does not have this function. I suggest to write simple function called nargoutchk.m and put it into the CRPtool folder: function out = nargoutchk(in1,in2) % do nothing By doing this you only lose...
by Norbert
Wed Apr 19, 2017 20:32
Forum: General Discussion
Topic: Asymmetry of FAN CRPs
Replies: 1
Views: 13484

Re: Asymmetry of FAN CRPs

Hi Mircea, you are right, when using the fixed number of neighbours (which is the original definition of an RP by Eckmann 1987) the RP is not symmetric. This should be clear because for recurrence pair i and j the k nearest neighbours of the state at time point i are not necessarily the k nearest ne...
by Norbert
Tue Jan 24, 2017 10:56
Forum: General Discussion
Topic: CRQAD analyze
Replies: 1
Views: 13335

Re: CRQAD analyze

Hi,

it depends on the data. I assume that you somehow normalized the data beforehand.

Then, only look at the RR. RR is the probability of recurrence with respect to some lag. Therefore, in your case, I would chose lag +15.

Best
Norbert
by Norbert
Mon Jan 9, 2017 14:40
Forum: General Discussion
Topic: CRP for aggregation?
Replies: 3
Views: 15793

Re: CRP for aggregation?

sounds more like feature extraction or support vector machines. I'm not an expert in this. :?
by Norbert
Thu Jan 5, 2017 11:52
Forum: Installation
Topic: Fail to install.
Replies: 5
Views: 77708

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: 12071

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: 16617

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: 16617

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: 13558

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: 14102

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. Be...
by Norbert
Mon Aug 29, 2016 14:47
Forum: General Discussion
Topic: CRP Toolbox for Visual Fixations - Set Threshold?
Replies: 1
Views: 13474

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 Symposium
Topic: Minisymposium on Recurrence Plots at the PNLD2016
Replies: 0
Views: 22059

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: 12292

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 ...
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: 11594

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: 46638

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...