How to get 2nd minimun value from matrix?

I want to get the 2nd minimum number from a matrix. Elements in matrix are random and i don't want to sort them. for example

A=[2 6 83 14 29;17 42 31 90 23;17 52 43 81 29;48 11 90 21 58];

Answer 1

[Jeremy]

It is a little cumbersome but for any array x, this should work:

min(x(x~=min(x(:))))

Answer 2

[Guillaume]

I don't want to sort them.

Asking for the nth element is by definition sorting them.

One possible way (which obviously does a sort):

 A = [2 6 83 14 29;17 42 31 90 23;17 52 43 81 29;48 11 90 21 58];
 u = unique(A);
 a2 = u(2) %achtung baby!

[Zahid Iqbal Rana]

its not giving correct result.

[Guillaume]

Huh! And what is the 'correct result' you expect?