MATLAB: Extracting certain data from multiple column vectors

extracting datafor loop

So I have 50 different 1 column vectors that I need to extract certain data from each vector. I need to define a new vector when t(i+1) < t(i). So there is one drop in my vector and I need to be able to find it, then create a new vector with only the information from that point until the end of the vector without overwriting the other vector. Each of the 50 vectors I have all have a different number of rows and this drop point of my data all happens in a different spot too. How do I write a for/if loop to find this new set of data?

Best Answer

splitVec = @(V) mat2cell(V(:), diff([0; find(diff(V(:))<0); length(V)]), 1);

If your 50 vectors are in a cell array, say V50, then you can

cellfun(splitVec, V50, 'Uniform', 0)

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Try this:

% Define component cell arrays.
v1 = {'a'; 'b'; 'c'}
v2 = {'d'}
v3 = {'e'; 'f'}
% Find out how  big cell array needs to be.
lv1 = length(v1);
lv2 = length(v2);
lv3 = length(v3);
rows = max([lv1,lv2,lv3])
% Instatiate cell array of the max size.
v4 = cell(rows, 3)
% stuff each column in.
v4(1:lv1, 1) = v1;
v4(1:lv2, 2) = v2;
v4(1:lv3, 3) = v3;
% Print out results
fprintf('\n\nHere is the output cell array:\n');
v4

In the command window:

Here is the output cell array:

v4 = 
    'a'    'd'    'e'
    'b'     []    'f'
    'c'     []     []

Best Answer

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