How extract a submatrix out of a main matrix?
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Naruto
am 8 Nov. 2020
Kommentiert: Ameer Hamza
am 9 Nov. 2020
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.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/406870/image.png)
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
am 8 Nov. 2020
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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