question: private T selectPivot ( int from , int to ) { int count = ( int ) ( 6 * Math . log10 ( to - from ) ) ; count = Math . min ( count , temp . length ) ; int step = ( to - from ) / count ; for ( int i = from , j = 0 ; i < to ; i += step , j ++ ) { temp [ j ] = data [ i ] ; } T pivot = select ( temp , 0 , count - 1 , count / 2 ) ; return pivot ; }
target:  Select a pivot. To ensure a good pivot is select, the median element of a sample of the data is calculated.