How to group elements of an array

I have a array of 1500 rows and 2 columns Now among the 1500 rows there are repetition of values like 5 100s 2 300 etc... now i need to group all these 100s such that i find the minimum value of column for this group. How to do that

[Friedrich]

Are you looking for the sort function? If not, can you post a small example matrix and the output you would like to get?

Answer 1

[Andrei Bobrov]

try this is code, let A - your array with size 1500 x 2.

k = find(abs(A(:,2) - 100) < eps(100));
[val,idx0] = min(A(k,1));
out = [val,k(idx0)];

[Nisha Rajiv]

thank u so much. It was useful for me..