MATLAB: How to filter out multiple rows based on another array

MATLAB

I have two arrays, a, b, one has numbers from 1,2, to 12. The other has 5 numbers 3,4, to 7. I want to filter out the rows in a that are not in b. How to do that? Thanks in advance.

Best Answer

result = a(ismember(a,b));

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MATLAB: How to delete columns from a matrix based on an array

A(:,ismember(A(1,:),B)) = [];

MATLAB: Filtering out rows of data based on criteria from different columns

Try this:

accuracy = data(:, 15); % If accuracy is in column 15.
RT = data(:, 37); % If response time is in column 37
goodRows = find(accuracy == 1 & RT > 200);
for k = goodRows
    thisRow = data(k, :);
    % Do something with this row.
end

for the means, you can use grpstats() if you have the Statistics and Machine Learning Toolbox. Make a column vector with 1, 2, or 3 depending on if the element is "negative", 'neutral' or 'positive'

col = 17; % Column with the words in it.
[rows, columns] = size(data);
groups = ones(rows, 1);
for k = 1 : size(data, 1)
    if contains(data(k,col), 'neutral')
        groups(k) = 2;
    elseif contains(data(k,col), 'positive')
        groups(k) = 3;
    end
end
t = table(data,..... whatever
statarray = grpstats(t, groups);

Best Answer

Related Solutions

MATLAB: How to delete columns from a matrix based on an array

MATLAB: Filtering out rows of data based on criteria from different columns

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