A graphical user interface (GUI) for specifying the variable used to sort the data set.
character. Vector of variable names
integer. Index for the variable used to sort the data set.
tkwin. GUI parent window
Returns an object of integer class that specifies the index of the variable used to sort the data set.
Attributes for this object include:
decreasing, a logical value indicating if the sort order is increasing or decreasing; and
na.last, a logical value for controlling the treatment of
NAs during sorting.
If true, missing values in the data are put last; otherwise, they are put first;
NA, they are removed.
J.C. Fisher, U.S. Geological Survey, Idaho Water Science Center
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