last daily observation in a month (not lbusdate)

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is there a way to keep only the last observation in a month from a datenum vector? For example
A=
729530
729537
729544
729551
729558
729565
That is
20-May-1997
27-May-1997
03-Jun-1997
10-Jun-1997
17-Jun-1997
24-Jun-1997
So the new vector should be only rows 2 and 6.
B=
729537
729565
This is not lbusdate.

Accepted Answer

Dave
Dave on 16 Nov 2017
Solved, used accumarray with @max

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