NAME

       lasrt - lasrt: sort vector

SYNOPSIS

   Functions
       subroutine dlasrt (id, n, d, info)
           DLASRT sorts numbers in increasing or decreasing order.
       subroutine slasrt (id, n, d, info)
           SLASRT sorts numbers in increasing or decreasing order.

Detailed Description

Function Documentation

   subroutine dlasrt (character id, integer n, double precision, dimension( * ) d, integer info)
       DLASRT sorts numbers in increasing or decreasing order.

       Purpose:

            Sort the numbers in D in increasing order (if ID = 'I') or
            in decreasing order (if ID = 'D' ).

            Use Quick Sort, reverting to Insertion sort on arrays of
            size <= 20. Dimension of STACK limits N to about 2**32.

       Parameters
           ID

                     ID is CHARACTER*1
                     = 'I': sort D in increasing order;
                     = 'D': sort D in decreasing order.

           N

                     N is INTEGER
                     The length of the array D.

           D

                     D is DOUBLE PRECISION array, dimension (N)
                     On entry, the array to be sorted.
                     On exit, D has been sorted into increasing order
                     (D(1) <= ... <= D(N) ) or into decreasing order
                     (D(1) >= ... >= D(N) ), depending on ID.

           INFO

                     INFO is INTEGER
                     = 0:  successful exit
                     < 0:  if INFO = -i, the i-th argument had an illegal value

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

   subroutine slasrt (character id, integer n, real, dimension( * ) d, integer info)
       SLASRT sorts numbers in increasing or decreasing order.

       Purpose:

            Sort the numbers in D in increasing order (if ID = 'I') or
            in decreasing order (if ID = 'D' ).

            Use Quick Sort, reverting to Insertion sort on arrays of
            size <= 20. Dimension of STACK limits N to about 2**32.

       Parameters
           ID

                     ID is CHARACTER*1
                     = 'I': sort D in increasing order;
                     = 'D': sort D in decreasing order.

           N

                     N is INTEGER
                     The length of the array D.

           D

                     D is REAL array, dimension (N)
                     On entry, the array to be sorted.
                     On exit, D has been sorted into increasing order
                     (D(1) <= ... <= D(N) ) or into decreasing order
                     (D(1) >= ... >= D(N) ), depending on ID.

           INFO

                     INFO is INTEGER
                     = 0:  successful exit
                     < 0:  if INFO = -i, the i-th argument had an illegal value

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

Author

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