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|Home MathPack DataTable Methods SortCols|
|See also: OnSortExchange, SortRows, SortColAttributes, SortColNames|
The method SortCols provides a means to sort the columns of the data table, or part of it, according to the values in a single row. This row is specified by the parameter SortRowIx. The table is sorted column by column within the range [LowCol,LowRow] to [HighCol,HighRow]. The values outside this range are not affected (except for the row addressed by SortRowIx ). The sorting order is determined by the row SortRowIdx which is also sorted within the range [LowCol, HighCol ]. The parameter Ascending specifies whether the valus are to be sorted in ascending (TRUE) or descending (FALSE) order. The parameter IncludeHeaders determines whether the column names, decimal places, and columns attributes are sorted too. Note that in most cases this parameter should be set TRUE.
The sorting is performed by a modified bubble sort (CombSort), which has been reported to be comparable in speed to QuickSort (see also R.Box, S. Lacey, BYTE magazine, April 1991). The event OnSortExchange is triggered whenever two columns have to be exchanged during the sorting process.