Find first row with certain value in x2 array

I have an 300x2 array in which I need to find a certain numbert in colum 1, e.g. 10. Once the number is found I need to extract the corresponding value in colum 2.

[dpb]

Read on logical indexing ...

Answer 1

[Chunru]

idx = A(:, 1) == 10;    % find the index that 1st column = 10
b = A(idx, 2);          % extract the corresponding data in 2nd column

Or in one line

b = A(A(:,1)==10, 2);

[Gevin Schaeffer]

Thanks :) ! it is really that simple. I literally just started with MATLAB