[R] create group markers in original data frame ie. countinued... ? to calculate sth for groups defined between points in one variable (string), /separating/ spliting variable into groups by i.e. between A-B, B-C, C-D, from: A, NA, NA, B, NA, NA, C, NA, NA, NA, D

Eugeniusz Kaluza Eugeniusz.Kaluza at polsl.pl
Fri Jun 25 14:48:27 CEST 2010


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