#include "blaswrap.h" #include "f2c.h" /* Subroutine */ int dlamrg_(integer *n1, integer *n2, doublereal *a, integer *dtrd1, integer *dtrd2, integer *index) { /* -- LAPACK routine (version 3.1) -- Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. November 2006 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. Arguments ========= N1 (input) INTEGER N2 (input) INTEGER These arguements contain the respective lengths of the two sorted lists to be merged. A (input) 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 (input) INTEGER DTRD2 (input) 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 (output) 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. ===================================================================== Parameter adjustments */ /* System generated locals */ integer i__1; /* Local variables */ static integer i__, ind1, ind2, n1sv, n2sv; --index; --a; /* Function Body */ n1sv = *n1; n2sv = *n2; if (*dtrd1 > 0) { ind1 = 1; } else { ind1 = *n1; } if (*dtrd2 > 0) { ind2 = *n1 + 1; } else { ind2 = *n1 + *n2; } i__ = 1; /* while ( (N1SV > 0) & (N2SV > 0) ) */ L10: if (n1sv > 0 && n2sv > 0) { if (a[ind1] <= a[ind2]) { index[i__] = ind1; ++i__; ind1 += *dtrd1; --n1sv; } else { index[i__] = ind2; ++i__; ind2 += *dtrd2; --n2sv; } goto L10; } /* end while */ if (n1sv == 0) { i__1 = n2sv; for (n1sv = 1; n1sv <= i__1; ++n1sv) { index[i__] = ind2; ++i__; ind2 += *dtrd2; /* L20: */ } } else { /* N2SV .EQ. 0 */ i__1 = n1sv; for (n2sv = 1; n2sv <= i__1; ++n2sv) { index[i__] = ind1; ++i__; ind1 += *dtrd1; /* L30: */ } } return 0; /* End of DLAMRG */ } /* dlamrg_ */