How to find minimum number in matrix and form a new matrix based on that

Suppose matrix A is as follows:

A = [14  478
14  668
14  708
14  1143
18  468
18  653
18  718
18  813
23  378
23  393
23  573
23  588
23  663
23  743
23  873
24  333
24  338
24  858
26  373
26  408
26  423
26  433
26  438
26  468
26  473
26  663
26  713
26  983];

First column is unique ID, I want to form matrix B in the way that include the minimum number belong to every ID.

B = [14  478
18  468
23  378
24  333
26  373];

Answer 1

[Image Analyst]

If you have the Statistics and Machine Learning Toolbox (type ver to find out), then use grpstats():

B = grpstats(A, A(:, 1), 'min')