Find Q-criterion and Lambda2 from velocity values

Hello everyone, hope you are doing great.

I have a matlab code which reads a file that has x, y and z velocity values, as well as corresponding time for each value this is what it looks like:

clear all; clc

[file_list, path_n] = uigetfile('.txt', 'Multiselect', 'on');
filesSorted = natsortfiles(file_list);

if iscell(filesSorted) == 0;
    filesSorted = (filesSorted);
end


for i = 1:length(filesSorted);
    filename = filesSorted{i};
    data = load([path_n filename]);
    
    % Define x and y from the uploaded files
    x =  data (:,1);
    y =  data (:,2);
    
    % Define Time for each value of the uploaded files
    Time(i) = data (1,3);
    Time_tp = Time';
    
    
end

Is there a way to get Lambda2 "λ" and Q-criterion values from the velocity data?

Thank you so much, stay safe