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119 lines
2.8 KiB
C
119 lines
2.8 KiB
C
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#include "clapack.h"
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/* Subroutine */ int dlamrg_(integer *n1, integer *n2, doublereal *a, integer
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*dtrd1, integer *dtrd2, integer *index)
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{
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/* System generated locals */
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integer i__1;
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/* Local variables */
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integer i__, ind1, ind2, n1sv, n2sv;
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/* -- LAPACK routine (version 3.1) -- */
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/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
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/* November 2006 */
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/* .. Scalar Arguments .. */
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/* .. */
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/* .. Array Arguments .. */
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/* .. */
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/* Purpose */
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/* ======= */
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/* DLAMRG will create a permutation list which will merge the elements */
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/* of A (which is composed of two independently sorted sets) into a */
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/* single set which is sorted in ascending order. */
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/* Arguments */
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/* ========= */
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/* N1 (input) INTEGER */
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/* N2 (input) INTEGER */
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/* These arguements contain the respective lengths of the two */
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/* sorted lists to be merged. */
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/* A (input) DOUBLE PRECISION array, dimension (N1+N2) */
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/* The first N1 elements of A contain a list of numbers which */
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/* are sorted in either ascending or descending order. Likewise */
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/* for the final N2 elements. */
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/* DTRD1 (input) INTEGER */
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/* DTRD2 (input) INTEGER */
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/* These are the strides to be taken through the array A. */
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/* Allowable strides are 1 and -1. They indicate whether a */
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/* subset of A is sorted in ascending (DTRDx = 1) or descending */
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/* (DTRDx = -1) order. */
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/* INDEX (output) INTEGER array, dimension (N1+N2) */
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/* On exit this array will contain a permutation such that */
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/* if B( I ) = A( INDEX( I ) ) for I=1,N1+N2, then B will be */
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/* sorted in ascending order. */
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/* ===================================================================== */
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/* .. Local Scalars .. */
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/* .. */
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/* .. Executable Statements .. */
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/* Parameter adjustments */
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--index;
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--a;
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/* Function Body */
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n1sv = *n1;
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n2sv = *n2;
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if (*dtrd1 > 0) {
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ind1 = 1;
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} else {
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ind1 = *n1;
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}
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if (*dtrd2 > 0) {
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ind2 = *n1 + 1;
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} else {
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ind2 = *n1 + *n2;
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}
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i__ = 1;
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/* while ( (N1SV > 0) & (N2SV > 0) ) */
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L10:
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if (n1sv > 0 && n2sv > 0) {
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if (a[ind1] <= a[ind2]) {
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index[i__] = ind1;
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++i__;
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ind1 += *dtrd1;
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--n1sv;
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} else {
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index[i__] = ind2;
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++i__;
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ind2 += *dtrd2;
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--n2sv;
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}
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goto L10;
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}
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/* end while */
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if (n1sv == 0) {
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i__1 = n2sv;
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for (n1sv = 1; n1sv <= i__1; ++n1sv) {
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index[i__] = ind2;
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++i__;
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ind2 += *dtrd2;
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/* L20: */
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}
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} else {
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/* N2SV .EQ. 0 */
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i__1 = n1sv;
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for (n2sv = 1; n2sv <= i__1; ++n2sv) {
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index[i__] = ind1;
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++i__;
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ind1 += *dtrd1;
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/* L30: */
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}
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}
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return 0;
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/* End of DLAMRG */
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} /* dlamrg_ */
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