Hi,

I have a data frame that looks like this:

>x

x1  x2  x3
A   1    1.5
B   2    0.9
B   3    2.7
C   7    1.8
D   7    1.3

I want to "group" by the x1 column and in the case of multiple x$x1 values
(e.g., "B")d, return rows that have the smallest values of x2. In the case
of rows with only one value of x1 (e.g., "A"), return the row as is. How can
I do that?  For example, in the above case, the output I want would be:

x1  x2  x3
A   1    1.5
B   2    0.9
C   7    1.8
D   7    1.3


Thanks!

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