How to define visibility graph criterion in matlab code

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Kathleen on 14 Apr 2016
Edited: Bruce Priddy on 10 Sep 2016
Dear colleagues,
Could you give me assistances? How to define visibility graph criterion in matlab code? Many thanks!

Bruce Priddy on 10 Sep 2016
Edited: Bruce Priddy on 10 Sep 2016
There is a Fortran code for the Horizontal Visibility Graph at
and the code below for regular visibilty graph which I have not tried but looks incomplete
function varargout=visgraph(varargin)
[k,logP]=visgraph(x)
%Generate Conway Series
N=1000;
a=ones(N,1);
out=ones(N,1);
for n=3:N
a(n)=a(a(n-1))+ a(n-a(n-1));
out(n)= a(n) - (n/2);
end
%Generate Surrogate Data
nS=5;
S=surrogate(out,nS);
subplot(3,1,1)
plot(out);title('Conway Series')
subplot(3,1,2)
plot(S(:,1),'r');title('Amplitude Adjusted Surrogate Data')
%Calculate visibility graph for all series
[k,logP]=visgraph(out);
subplot(3,1,3)
plot(k,logP);hold on;grid on
for n=1:nS
[k,logP]=visgraph(S(:,n));
subplot(3,1,3)
plot(k,logP,'r');
end