[R] How can i keep only latest entries?

[Mat]

Hello togehter,

i have a data.frame like this one:

    No. Date                 last change
1  1     2012-10-04     change settings
2  1     2012-10-20     bug fix
3  1     2012-11-05     final
4  2     2013-01-15    new task
5  2     2013-01-16    Bug fix
6  2     2013-01-17    final

now i want a new data.frame, who show me only the newest entries according
to the No.
The solution look like this one:

   No. Date                last change
1  1     2012-11-05   final
2  2     2013-01-17   final

can anyone help me?

thanks.

Mat



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