How to extract data out of coi of wcoherence?

How to ignore data out of coi (data outside white dashed lines) and just quantify high magnitiude data discarding coi data?

Answer 1

[Shubham]

Hey Hashini Wanniarachchi,

To extract the data points outside the region bounded by coi, you can simply compare the y-coordinates at a particular time stamp of the values present in the coherence matrix and coi vector.

The pseudocode could look like:

% Perform wavelet coherence analysis 
[wcoh, wcs, period, coi] = wcoherence(x, y); 

% Get the size of the coherence matrix 
[rows, cols] = size(wcoh) 
 
% Identify data points outside the cone of influence 
coi_indices = zeros(rows, cols); 
for i = 1:rows 
    for j = 1:cols 
        if wcoh(i,j) < coi(j) 
            coi_indices(i, j) = 1; % Data point outside the COI (mark that index)
        end 
    end 
end 

Hope this helps!