How to get first 3 maximum number in a matrix

Suppose I have a matrix m:

m = [7;1;4;4;12;2;6;10;2];

I want to find first 3 maximum in matrix m, means like:

n = [7;12;10]; % sorting is not issue

Answer 1

[Adam]

temp = sort( m, 'descend' );
n = temp(1:3);

[Moe]

Thanks. How to find index number of n?

[Adam]

[temp, idx] = sort( m, 'descend' );
n = temp(1:3);
idx = idx(1:3);

Answer 2

[Azzi Abdelmalek]

n=sort(m)
n=n(end:end-2)

Answer 3

[Matt J]

Bruno Luong took the trouble to make a fast MEX implementation

http://www.mathworks.com/matlabcentral/fileexchange/23576-min-max-selection