MATLAB: How to find y axis value’s opposite x axis value

Question

for ex:x=1,2,3,4,5,6;y=2,7,8,9,4,1 i want pick up the y axis (9) opposite x axis value

Answer 1

If both vectors are of same size, find the index of your variable from y and use it to pick the value at that position in x. A simple example is

 x = [1 2 3 4];
 y = [5 6 7 8];
 ind = find(y==7);
 x(ind);