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lamrg(3) LAPACK lamrg(3)

NAME

lamrg - lamrg: permutation to merge 2 sorted lists

SYNOPSIS

Functions


subroutine dlamrg (n1, n2, a, dtrd1, dtrd2, index)
DLAMRG creates a permutation list to merge the entries of two independently sorted sets into a single set sorted in ascending order. subroutine slamrg (n1, n2, a, strd1, strd2, index)
SLAMRG creates a permutation list to merge the entries of two independently sorted sets into a single set sorted in ascending order.

Detailed Description

Function Documentation

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.

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

N1 

!>          N1 is INTEGER
!>

N2

!>          N2 is INTEGER
!>         These arguments contain the respective lengths of the two
!>         sorted lists to be merged.
!>

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.
!>

DTRD1

!>          DTRD1 is INTEGER
!>

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.
!>

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.

subroutine slamrg (integer n1, integer n2, real, dimension( * ) a, integer strd1, integer strd2, integer, dimension( * ) index)

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

Purpose:

!>
!> SLAMRG 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

N1 

!>          N1 is INTEGER
!>

N2

!>          N2 is INTEGER
!>         These arguments contain the respective lengths of the two
!>         sorted lists to be merged.
!>

A

!>          A is REAL 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.
!>

STRD1

!>          STRD1 is INTEGER
!>

STRD2

!>          STRD2 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 (STRDx = 1) or descending
!>         (STRDx = -1) order.
!>

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.

Author

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Tue Jun 30 2026 04:57:07 Version 3.12.0