I would like to discuss something about the function "filtdir.m" for detection of coupling direction, downloaded from http://tocsy.pik-potsdam.de/.
I tried to reproduce the results for the problem of "three oscillators in a ring", from the publication ' Identification of coupling direction: Application to cardiorespiratory interaction, Phys. Rev. E, 65, 2002, 041909'.
But for every set of data i am only getting zeros for the couplings C1 & C2 and Nan for directionality index.
Should something be done in the mldivide step (i am finding zeros from that step...). could someone help me with this problem.
Anything what is not related.
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