Hi,
On Nov 29, 2010, at 7:40 PM, wrote:
How do I create a second dataframe that shows unique column values
from first dataframe and the number count of rows in first dataframe
where column value appears?
For example, first dataframe is this:
x <- matrix(c(101:104,101:104,105:106,1:10),
How do I create a second dataframe that shows unique column values from first
dataframe and the number count of rows in first dataframe where column value
appears?
For example, first dataframe is this:
> x <- matrix(c(101:104,101:104,105:106,1:10), nrow=10, ncol=2)
> x
[,1] [,2]
[1,] 1
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