How to get 2nd minimun value from matrix?

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Zahid Iqbal Rana
Zahid Iqbal Rana 2015-1-29
评论： Guillaume 2015-1-29
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];

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回答（2 个）

Jeremy
Jeremy 2015-1-29
It is a little cumbersome but for any array x, this should work:
min(x(x~=min(x(:))))
Guillaume
Guillaume 2015-1-29
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!

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