# dlamrg.f man page

dlamrg.f

## Synopsis

### Functions/Subroutines

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.

## Function/Subroutine 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.

**Date:**June 2016

Definition at line 101 of file dlamrg.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man page dlamrg(3) is an alias of dlamrg.f(3).

Tue Nov 14 2017 Version 3.8.0 LAPACK