MATLAB: Sorting through labelled data

MATLAB

Given the data of two columns below with negative and positive label
    '0,Negative'
    '1,Negative'
    '1,Positive'
    '2,Negative'
    '2,Positive'
    '3,Positive'
    '4,Negative'
    '4,Positive'
    '5,Positive'
    '9,Positive'
Please I want to use the code below to sort for negative or positive numbers instead of even and odd numeric data example code below
for col = 1:size(croppedz, 2) 
%sort even/odd rows, reshape each into a Kx? matrix, sum across rows and divide the two sums
% K = can be anynumber that groups it
result(:, col) = sum(reshape(sort(croppedz(1:2:end, col)), K, []), 1) ./ sum(reshape(sort(croppedz(2:2:end, col)), K, []), 1); 
end        
end
Thanks for your help in advance
Tino

Best Answer

str = { '0,Negative'
    '1,Negative'
    '1,Positive'
    '2,Negative'
    '2,Positive'
    '3,Positive'
    '4,Negative'
    '4,Positive'
    '5,Positive'
    '9,Positive'} ;
% Get positive 
idx = contains(str,'Positive') ; 
str(idx)
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