Hello, I'm trying to extract the common rows from a data frame, which is
something like this :
* DEPTH SALINITY DEPTH SALINITY*
*18 87 39.06 94 39.06*
*19 173 39.05 141 NA*
*20 260 39.00 188 39.07*
*21 312 38.97 207 39.03*
*22 1 39.36 1 39.35*
*23 10 39.36 10 39.33*
*24 20 39.36 20 39.33*
*25 30 39.35 30 39.33*
*
*
i want to extract the rows with the same depth.
i cannot do something like *data.frame[22:25,]* because i have lots of rows
any help?
thank you
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