sort 3 column matrix by two key words

how to do this in matlab? sort the matrix raws first by the first column, then by the second column?

input = [
1  2  11
1  2  11
1  2  12
1  2  11
1  2  11
1  2  12
1  3  17
1  3  15
1  4  18
1  4  18
1  3  15
1  3  16
2  3  17
2  3  15
1  3  16
1  3  17
1  3  15
1  3  15
1  3  15
1  3  16
1  2  12
1  2  11
1  2  11
1  2  11
1  4  18
1  4  18
1  4  18
2  4  17
2  4  17
1  4  17
1  4  17
1  4  17
]

output = [1  2  11
1  2  11
1  2  12
1  2  11
1  2  11
1  2  12
1  2  12
1  2  11
1  2  11
1  2  11
1  3  17
1  3  15
1  3  15
1  3  16
1  3  16
1  3  17
1  3  15
1  3  15
1  3  15
1  3  16
1  4  18
1  4  18
1  4  18
1  4  18
1  4  18
1  4  17
1  4  17
1  4  17
2  3  17
2  3  15
2  4  17
2  4  17
]

Answer 1

[Walter Roberson]

output sortrows(input, [1 2]);

[HONG CHENG]

thanks a lot, this function is what I need.

I also have another question, maybe you are interested in it too

draw the multiple-measurement training data(3D) and single predicted data(3D) in 2D

that problem in the link is based on this problem.