Need to compare one value to an array that has 1000 decimal values

I have a=0.3, I have a vector jki=0:0.00065:0.65 (its a 1x1001 vector). I want to compare each value of jki to a, if that is true, display something. I've tried searching online but don't really understand still how to do it. This is what my guess would be for the code, but it doesn't work:

    for k=1:size(jki)
       if jki(k)==a
          disp('something');
       end
    end

[Walter Roberson]

What is the difference between this and your earlier https://www.mathworks.com/matlabcentral/answers/421321-test-value-equality-within-a-range-of-values ?