[R] Split dataset as factor and numeric

[Jan Sabee]

Dear all,
If I have dataset like,
A1    25
B     2
AA    0
C     0
A1    1
B     3
A1    0
C     3
B     0
A1    45
A1    7
C     0
B     0
A1    0
B     6
B     3

Is there any function to split like,
A1    25
A1    1
A1    0
A1    45
A1    7
A1    0

or 

AA    0
C     0
A1    0
B     0
B     0
C     0
B     0
A1    0

Thanks,
Jan Sabee