How extract a submatrix out of a main matrix?

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Naruto 2020-11-8

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https://ww2.mathworks.cn/matlabcentral/answers/640635-how-extract-a-submatrix-out-of-a-main-matrix

评论： Ameer Hamza 2020-11-9

I have a matrix A (50x2) and I want to extract a certain number of row observations that statisfies the condition where I output the rows that include '1' in column 2 along with another column that would state 'yes'. How can I do that?

The first column are the ID numbers and the second column would be a '1' for yes and a '0' for no.

I understand that a for loop would be applicable here but I have tried out a couple which didnt work out in adding it an extra column displayed.

thanks.

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Ameer Hamza 2020-11-8

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https://ww2.mathworks.cn/matlabcentral/answers/640635-how-extract-a-submatrix-out-of-a-main-matrix#answer_538000

在 MATLAB Online 中打开

Easy peasy

M_new = M(M(:,2)==1,:); % M is your n*2 matrix

Read about logical indexing: https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html

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Naruto 2020-11-8

Nice! Thanks for the link as well.

Ameer Hamza 2020-11-9

I am glad to be of help!

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