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/* ../SRC/dsesrt.f -- translated by f2c (version 20061008).
You must link the resulting object file with libf2c:
on Microsoft Windows system, link with libf2c.lib;
on Linux or Unix systems, link with .../path/to/libf2c.a -lm
or, if you install libf2c.a in a standard place, with -lf2c -lm
-- in that order, at the end of the command line, as in
cc *.o -lf2c -lm
Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
http://www.netlib.org/f2c/libf2c.zip
*/
#include "f2c.h"
/* Table of constant values */
static integer c__1 = 1;
/* ----------------------------------------------------------------------- */
/* \BeginDoc */
/* \Name: dsesrt */
/* \Description: */
/* Sort the array X in the order specified by WHICH and optionally */
/* apply the permutation to the columns of the matrix A. */
/* \Usage: */
/* call dsesrt */
/* ( WHICH, APPLY, N, X, NA, A, LDA) */
/* \Arguments */
/* WHICH Character*2. (Input) */
/* 'LM' -> X is sorted into increasing order of magnitude. */
/* 'SM' -> X is sorted into decreasing order of magnitude. */
/* 'LA' -> X is sorted into increasing order of algebraic. */
/* 'SA' -> X is sorted into decreasing order of algebraic. */
/* APPLY Logical. (Input) */
/* APPLY = .TRUE. -> apply the sorted order to A. */
/* APPLY = .FALSE. -> do not apply the sorted order to A. */
/* N Integer. (INPUT) */
/* Dimension of the array X. */
/* X Double precision array of length N. (INPUT/OUTPUT) */
/* The array to be sorted. */
/* NA Integer. (INPUT) */
/* Number of rows of the matrix A. */
/* A Double precision array of length NA by N. (INPUT/OUTPUT) */
/* LDA Integer. (INPUT) */
/* Leading dimension of A. */
/* \EndDoc */
/* ----------------------------------------------------------------------- */
/* \BeginLib */
/* \Routines */
/* dswap Level 1 BLAS that swaps the contents of two vectors. */
/* \Authors */
/* Danny Sorensen Phuong Vu */
/* Richard Lehoucq CRPC / Rice University */
/* Dept. of Computational & Houston, Texas */
/* Applied Mathematics */
/* Rice University */
/* Houston, Texas */
/* \Revision history: */
/* 12/15/93: Version ' 2.1'. */
/* Adapted from the sort routine in LANSO and */
/* the ARPACK code dsortr */
/* \SCCS Information: @(#) */
/* FILE: sesrt.F SID: 2.3 DATE OF SID: 4/19/96 RELEASE: 2 */
/* \EndLib */
/* ----------------------------------------------------------------------- */
/* Subroutine */ int dsesrt_(char *which, logical *apply, integer *n,
doublereal *x, integer *na, doublereal *a, integer *lda, ftnlen
which_len)
{
/* System generated locals */
integer a_dim1, a_offset, i__1;
doublereal d__1, d__2;
/* Builtin functions */
integer s_cmp(char *, char *, ftnlen, ftnlen);
/* Local variables */
static integer i__, j, igap;
static doublereal temp;
extern /* Subroutine */ int dswap_(integer *, doublereal *, integer *,
doublereal *, integer *);
/* %------------------% */
/* | Scalar Arguments | */
/* %------------------% */
/* %-----------------% */
/* | Array Arguments | */
/* %-----------------% */
/* %---------------% */
/* | Local Scalars | */
/* %---------------% */
/* %----------------------% */
/* | External Subroutines | */
/* %----------------------% */
/* %-----------------------% */
/* | Executable Statements | */
/* %-----------------------% */
/* Parameter adjustments */
a_dim1 = *lda;
a_offset = 1 + a_dim1 * 0;
a -= a_offset;
/* Function Body */
igap = *n / 2;
if (s_cmp(which, "SA", (ftnlen)2, (ftnlen)2) == 0) {
/* X is sorted into decreasing order of algebraic. */
L10:
if (igap == 0) {
goto L9000;
}
i__1 = *n - 1;
for (i__ = igap; i__ <= i__1; ++i__) {
j = i__ - igap;
L20:
if (j < 0) {
goto L30;
}
if (x[j] < x[j + igap]) {
temp = x[j];
x[j] = x[j + igap];
x[j + igap] = temp;
if (*apply) {
dswap_(na, &a[j * a_dim1 + 1], &c__1, &a[(j + igap) *
a_dim1 + 1], &c__1);
}
} else {
goto L30;
}
j -= igap;
goto L20;
L30:
;
}
igap /= 2;
goto L10;
} else if (s_cmp(which, "SM", (ftnlen)2, (ftnlen)2) == 0) {
/* X is sorted into decreasing order of magnitude. */
L40:
if (igap == 0) {
goto L9000;
}
i__1 = *n - 1;
for (i__ = igap; i__ <= i__1; ++i__) {
j = i__ - igap;
L50:
if (j < 0) {
goto L60;
}
if ((d__1 = x[j], abs(d__1)) < (d__2 = x[j + igap], abs(d__2))) {
temp = x[j];
x[j] = x[j + igap];
x[j + igap] = temp;
if (*apply) {
dswap_(na, &a[j * a_dim1 + 1], &c__1, &a[(j + igap) *
a_dim1 + 1], &c__1);
}
} else {
goto L60;
}
j -= igap;
goto L50;
L60:
;
}
igap /= 2;
goto L40;
} else if (s_cmp(which, "LA", (ftnlen)2, (ftnlen)2) == 0) {
/* X is sorted into increasing order of algebraic. */
L70:
if (igap == 0) {
goto L9000;
}
i__1 = *n - 1;
for (i__ = igap; i__ <= i__1; ++i__) {
j = i__ - igap;
L80:
if (j < 0) {
goto L90;
}
if (x[j] > x[j + igap]) {
temp = x[j];
x[j] = x[j + igap];
x[j + igap] = temp;
if (*apply) {
dswap_(na, &a[j * a_dim1 + 1], &c__1, &a[(j + igap) *
a_dim1 + 1], &c__1);
}
} else {
goto L90;
}
j -= igap;
goto L80;
L90:
;
}
igap /= 2;
goto L70;
} else if (s_cmp(which, "LM", (ftnlen)2, (ftnlen)2) == 0) {
/* X is sorted into increasing order of magnitude. */
L100:
if (igap == 0) {
goto L9000;
}
i__1 = *n - 1;
for (i__ = igap; i__ <= i__1; ++i__) {
j = i__ - igap;
L110:
if (j < 0) {
goto L120;
}
if ((d__1 = x[j], abs(d__1)) > (d__2 = x[j + igap], abs(d__2))) {
temp = x[j];
x[j] = x[j + igap];
x[j + igap] = temp;
if (*apply) {
dswap_(na, &a[j * a_dim1 + 1], &c__1, &a[(j + igap) *
a_dim1 + 1], &c__1);
}
} else {
goto L120;
}
j -= igap;
goto L110;
L120:
;
}
igap /= 2;
goto L100;
}
L9000:
return 0;
/* %---------------% */
/* | End of dsesrt | */
/* %---------------% */
} /* dsesrt_ */
|
