LAPACK 3.11.0
LAPACK: Linear Algebra PACKage
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◆ dlamrg()

subroutine dlamrg ( integer  n1,
integer  n2,
double precision, dimension( * )  a,
integer  dtrd1,
integer  dtrd2,
integer, dimension( * )  index 
)

DLAMRG creates a permutation list to merge the entries of two independently sorted sets into a single set sorted in ascending order.

Download DLAMRG + dependencies [TGZ] [ZIP] [TXT]

Purpose:
 DLAMRG will create a permutation list which will merge the elements
 of A (which is composed of two independently sorted sets) into a
 single set which is sorted in ascending order.
Parameters
[in]N1
          N1 is INTEGER
[in]N2
          N2 is INTEGER
         These arguments contain the respective lengths of the two
         sorted lists to be merged.
[in]A
          A is DOUBLE PRECISION array, dimension (N1+N2)
         The first N1 elements of A contain a list of numbers which
         are sorted in either ascending or descending order.  Likewise
         for the final N2 elements.
[in]DTRD1
          DTRD1 is INTEGER
[in]DTRD2
          DTRD2 is INTEGER
         These are the strides to be taken through the array A.
         Allowable strides are 1 and -1.  They indicate whether a
         subset of A is sorted in ascending (DTRDx = 1) or descending
         (DTRDx = -1) order.
[out]INDEX
          INDEX is INTEGER array, dimension (N1+N2)
         On exit this array will contain a permutation such that
         if B( I ) = A( INDEX( I ) ) for I=1,N1+N2, then B will be
         sorted in ascending order.
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.