search a particular data in a array and return the index of the array that is found

my problem is same

if have array which only two columns

    X       Y

    10.2      12.3

    21.443      81.31

     32.23      43.32 so on

than how to get index value after find the data

suppose i have X value 21.443 and Y value 81.31

how to get the index value 2

Answer 1

[Guillaume]

This looks like a duplicate of your other question, this time possibly better explained. The answer is similar, use comparison and logical operations, together with find:

nodes = [10.2    12.3
         21.443  81.31
         32.23   43.31];

x = 21.443;
y = 43.32;
noderow = find(nodes(:, 2) == x & nodes(:, 3) == y)