Getting 1 value from another.

Lets say we have an array

20 4

21 5

22 3

23 2

24 1

25 2

26 7

if that table say =x how do I return a value in the first row from the second for example if I have x(:,2)==7 give ans=26 (first column corresponding to 7). Another example would be x(:,2)==2 give ans=25 Thanks

[Jan]

Why not 23 for the value 2?

Answer 1

[Jan]

x = [20 4; ...
     21 5; ...
     22 3; ...
     23 2; ...
     24 1; ...
     25 2; ...
     26 7]
search = 2;
index  = (x(:, 2) == search);
result = x(index, 1)

[James Connor]

Is it possible to do it by only considering rows. Like 2 is on the 6th row thus output 25?

[James Connor]

Sorry I didnt explain my question well, I mean for like max(x(:,2)); which would be 7 thus output a value of 26.

[Jan]

Perhaps you mean:

[value, index] = max(x(:, 2));
x(index, 1)