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Sorting program that uses a quicksort algorithm. Applies for an input array of Real(KIND=8) values which is reordered. It also returns an array of indexes sorted for increasing order of X. You can use GR8_SORT to reorder other arrays associated with X.

Arguments :
        X       R*8(*)  Unsorted/Sorted array           Input/Output
        INDEX   I(*)    Integer array of sorted indexes Output
        N       I       Length of arrays                Input
        *       Label   Error return

Gildas manager 2014-07-01