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|
/* ../SRC/dsortc.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"
/* ----------------------------------------------------------------------- */
/* \BeginDoc */
/* \Name: dsortc */
/* \Description: */
/* Sorts the complex array in XREAL and XIMAG into the order */
/* specified by WHICH and optionally applies the permutation to the */
/* real array Y. It is assumed that if an element of XIMAG is */
/* nonzero, then its negative is also an element. In other words, */
/* both members of a complex conjugate pair are to be sorted and the */
/* pairs are kept adjacent to each other. */
/* \Usage: */
/* call dsortc */
/* ( WHICH, APPLY, N, XREAL, XIMAG, Y ) */
/* \Arguments */
/* WHICH Character*2. (Input) */
/* 'LM' -> sort XREAL,XIMAG into increasing order of magnitude. */
/* 'SM' -> sort XREAL,XIMAG into decreasing order of magnitude. */
/* 'LR' -> sort XREAL into increasing order of algebraic. */
/* 'SR' -> sort XREAL into decreasing order of algebraic. */
/* 'LI' -> sort XIMAG into increasing order of magnitude. */
/* 'SI' -> sort XIMAG into decreasing order of magnitude. */
/* NOTE: If an element of XIMAG is non-zero, then its negative */
/* is also an element. */
/* APPLY Logical. (Input) */
/* APPLY = .TRUE. -> apply the sorted order to array Y. */
/* APPLY = .FALSE. -> do not apply the sorted order to array Y. */
/* N Integer. (INPUT) */
/* Size of the arrays. */
/* XREAL, Double precision array of length N. (INPUT/OUTPUT) */
/* XIMAG Real and imaginary part of the array to be sorted. */
/* Y Double precision array of length N. (INPUT/OUTPUT) */
/* \EndDoc */
/* ----------------------------------------------------------------------- */
/* \BeginLib */
/* \Author */
/* Danny Sorensen Phuong Vu */
/* Richard Lehoucq CRPC / Rice University */
/* Dept. of Computational & Houston, Texas */
/* Applied Mathematics */
/* Rice University */
/* Houston, Texas */
/* \Revision history: */
/* xx/xx/92: Version ' 2.1' */
/* Adapted from the sort routine in LANSO. */
/* \SCCS Information: @(#) */
/* FILE: sortc.F SID: 2.3 DATE OF SID: 4/20/96 RELEASE: 2 */
/* \EndLib */
/* ----------------------------------------------------------------------- */
/* Subroutine */ int dsortc_(char *which, logical *apply, integer *n,
doublereal *xreal, doublereal *ximag, doublereal *y, ftnlen which_len)
{
/* System generated locals */
integer 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, temp1, temp2;
extern doublereal dlapy2_(doublereal *, doublereal *);
/* %------------------% */
/* | Scalar Arguments | */
/* %------------------% */
/* %-----------------% */
/* | Array Arguments | */
/* %-----------------% */
/* %---------------% */
/* | Local Scalars | */
/* %---------------% */
/* %--------------------% */
/* | External Functions | */
/* %--------------------% */
/* %-----------------------% */
/* | Executable Statements | */
/* %-----------------------% */
igap = *n / 2;
if (s_cmp(which, "LM", (ftnlen)2, (ftnlen)2) == 0) {
/* %------------------------------------------------------% */
/* | Sort XREAL,XIMAG into increasing order of magnitude. | */
/* %------------------------------------------------------% */
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;
}
temp1 = dlapy2_(&xreal[j], &ximag[j]);
temp2 = dlapy2_(&xreal[j + igap], &ximag[j + igap]);
if (temp1 > temp2) {
temp = xreal[j];
xreal[j] = xreal[j + igap];
xreal[j + igap] = temp;
temp = ximag[j];
ximag[j] = ximag[j + igap];
ximag[j + igap] = temp;
if (*apply) {
temp = y[j];
y[j] = y[j + igap];
y[j + igap] = temp;
}
} else {
goto L30;
}
j -= igap;
goto L20;
L30:
;
}
igap /= 2;
goto L10;
} else if (s_cmp(which, "SM", (ftnlen)2, (ftnlen)2) == 0) {
/* %------------------------------------------------------% */
/* | Sort XREAL,XIMAG 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;
}
temp1 = dlapy2_(&xreal[j], &ximag[j]);
temp2 = dlapy2_(&xreal[j + igap], &ximag[j + igap]);
if (temp1 < temp2) {
temp = xreal[j];
xreal[j] = xreal[j + igap];
xreal[j + igap] = temp;
temp = ximag[j];
ximag[j] = ximag[j + igap];
ximag[j + igap] = temp;
if (*apply) {
temp = y[j];
y[j] = y[j + igap];
y[j + igap] = temp;
}
} else {
goto L60;
}
j -= igap;
goto L50;
L60:
;
}
igap /= 2;
goto L40;
} else if (s_cmp(which, "LR", (ftnlen)2, (ftnlen)2) == 0) {
/* %------------------------------------------------% */
/* | Sort XREAL 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 (xreal[j] > xreal[j + igap]) {
temp = xreal[j];
xreal[j] = xreal[j + igap];
xreal[j + igap] = temp;
temp = ximag[j];
ximag[j] = ximag[j + igap];
ximag[j + igap] = temp;
if (*apply) {
temp = y[j];
y[j] = y[j + igap];
y[j + igap] = temp;
}
} else {
goto L90;
}
j -= igap;
goto L80;
L90:
;
}
igap /= 2;
goto L70;
} else if (s_cmp(which, "SR", (ftnlen)2, (ftnlen)2) == 0) {
/* %------------------------------------------------% */
/* | Sort XREAL into decreasing order of algebraic. | */
/* %------------------------------------------------% */
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 (xreal[j] < xreal[j + igap]) {
temp = xreal[j];
xreal[j] = xreal[j + igap];
xreal[j + igap] = temp;
temp = ximag[j];
ximag[j] = ximag[j + igap];
ximag[j + igap] = temp;
if (*apply) {
temp = y[j];
y[j] = y[j + igap];
y[j + igap] = temp;
}
} else {
goto L120;
}
j -= igap;
goto L110;
L120:
;
}
igap /= 2;
goto L100;
} else if (s_cmp(which, "LI", (ftnlen)2, (ftnlen)2) == 0) {
/* %------------------------------------------------% */
/* | Sort XIMAG into increasing order of magnitude. | */
/* %------------------------------------------------% */
L130:
if (igap == 0) {
goto L9000;
}
i__1 = *n - 1;
for (i__ = igap; i__ <= i__1; ++i__) {
j = i__ - igap;
L140:
if (j < 0) {
goto L150;
}
if ((d__1 = ximag[j], abs(d__1)) > (d__2 = ximag[j + igap], abs(
d__2))) {
temp = xreal[j];
xreal[j] = xreal[j + igap];
xreal[j + igap] = temp;
temp = ximag[j];
ximag[j] = ximag[j + igap];
ximag[j + igap] = temp;
if (*apply) {
temp = y[j];
y[j] = y[j + igap];
y[j + igap] = temp;
}
} else {
goto L150;
}
j -= igap;
goto L140;
L150:
;
}
igap /= 2;
goto L130;
} else if (s_cmp(which, "SI", (ftnlen)2, (ftnlen)2) == 0) {
/* %------------------------------------------------% */
/* | Sort XIMAG into decreasing order of magnitude. | */
/* %------------------------------------------------% */
L160:
if (igap == 0) {
goto L9000;
}
i__1 = *n - 1;
for (i__ = igap; i__ <= i__1; ++i__) {
j = i__ - igap;
L170:
if (j < 0) {
goto L180;
}
if ((d__1 = ximag[j], abs(d__1)) < (d__2 = ximag[j + igap], abs(
d__2))) {
temp = xreal[j];
xreal[j] = xreal[j + igap];
xreal[j + igap] = temp;
temp = ximag[j];
ximag[j] = ximag[j + igap];
ximag[j + igap] = temp;
if (*apply) {
temp = y[j];
y[j] = y[j + igap];
y[j + igap] = temp;
}
} else {
goto L180;
}
j -= igap;
goto L170;
L180:
;
}
igap /= 2;
goto L160;
}
L9000:
return 0;
/* %---------------% */
/* | End of dsortc | */
/* %---------------% */
} /* dsortc_ */
|
