Find a specific set of values in a matrix

I'm trying to find some specific values from an array which has two columns

for example if one column looks like [0.1,0.2,0.5,0.6,0.1,0.9,0.1,0.3,0.2,0.5,0.1] I want the numbers >=0.2 from this column and with corresponding number in second column of the array.

Answer 1

[Mohammad Sami]

You can do this quite easily

twocolmat = rand(100,2);
idx = twocolmat(:,1) >= 0.2;
col2vals = twocolmat(idx,2);

[sajad shiekh]

This looks fine but I need to do some computation with the corresponding values of another column. As in above example I want numbers in batches such as (0.2,0.5,0.6) a one and second (0.9), 3rd one (0.3,0.2,0.5).....with their correspondind idx

[Mohammad Sami]

If you are new to matlab, please go through the matlab onramp course.

https://www.mathworks.com/learn/tutorials/matlab-onramp.html

It explains how indexing works in matlab among other things.