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|
/* ../SRC/zsortc.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: zsortc */
/* \Description: */
/* Sorts the Complex*16 array in X into the order */
/* specified by WHICH and optionally applies the permutation to the */
/* Double precision array Y. */
/* \Usage: */
/* call zsortc */
/* ( WHICH, APPLY, N, X, Y ) */
/* \Arguments */
/* WHICH Character*2. (Input) */
/* 'LM' -> sort X into increasing order of magnitude. */
/* 'SM' -> sort X into decreasing order of magnitude. */
/* 'LR' -> sort X with real(X) in increasing algebraic order */
/* 'SR' -> sort X with real(X) in decreasing algebraic order */
/* 'LI' -> sort X with imag(X) in increasing algebraic order */
/* 'SI' -> sort X with imag(X) in decreasing algebraic order */
/* 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. */
/* X Complex*16 array of length N. (INPUT/OUTPUT) */
/* This is the array to be sorted. */
/* Y Complex*16 array of length N. (INPUT/OUTPUT) */
/* \EndDoc */
/* ----------------------------------------------------------------------- */
/* \BeginLib */
/* \Routines called: */
/* dlapy2 LAPACK routine to compute sqrt(x**2+y**2) carefully. */
/* \Author */
/* Danny Sorensen Phuong Vu */
/* Richard Lehoucq CRPC / Rice University */
/* Dept. of Computational & Houston, Texas */
/* Applied Mathematics */
/* Rice University */
/* Houston, Texas */
/* Adapted from the sort routine in LANSO. */
/* \SCCS Information: @(#) */
/* FILE: sortc.F SID: 2.2 DATE OF SID: 4/20/96 RELEASE: 2 */
/* \EndLib */
/* ----------------------------------------------------------------------- */
/* Subroutine */ int zsortc_(char *which, logical *apply, integer *n,
doublecomplex *x, doublecomplex *y, ftnlen which_len)
{
/* System generated locals */
integer i__1, i__2, i__3;
doublereal d__1, d__2;
/* Builtin functions */
integer s_cmp(char *, char *, ftnlen, ftnlen);
double d_imag(doublecomplex *);
/* Local variables */
static integer i__, j, igap;
static doublecomplex temp;
static doublereal temp1, temp2;
extern doublereal dlapy2_(doublereal *, doublereal *);
/* %------------------% */
/* | Scalar Arguments | */
/* %------------------% */
/* %-----------------% */
/* | Array Arguments | */
/* %-----------------% */
/* %---------------% */
/* | Local Scalars | */
/* %---------------% */
/* %--------------------% */
/* | External functions | */
/* %--------------------% */
/* %--------------------% */
/* | Intrinsic Functions | */
/* %--------------------% */
/* %-----------------------% */
/* | Executable Statements | */
/* %-----------------------% */
igap = *n / 2;
if (s_cmp(which, "LM", (ftnlen)2, (ftnlen)2) == 0) {
/* %--------------------------------------------% */
/* | Sort X 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;
}
i__2 = j;
d__1 = x[i__2].r;
d__2 = d_imag(&x[j]);
temp1 = dlapy2_(&d__1, &d__2);
i__2 = j + igap;
d__1 = x[i__2].r;
d__2 = d_imag(&x[j + igap]);
temp2 = dlapy2_(&d__1, &d__2);
if (temp1 > temp2) {
i__2 = j;
temp.r = x[i__2].r, temp.i = x[i__2].i;
i__2 = j;
i__3 = j + igap;
x[i__2].r = x[i__3].r, x[i__2].i = x[i__3].i;
i__2 = j + igap;
x[i__2].r = temp.r, x[i__2].i = temp.i;
if (*apply) {
i__2 = j;
temp.r = y[i__2].r, temp.i = y[i__2].i;
i__2 = j;
i__3 = j + igap;
y[i__2].r = y[i__3].r, y[i__2].i = y[i__3].i;
i__2 = j + igap;
y[i__2].r = temp.r, y[i__2].i = temp.i;
}
} else {
goto L30;
}
j -= igap;
goto L20;
L30:
;
}
igap /= 2;
goto L10;
} else if (s_cmp(which, "SM", (ftnlen)2, (ftnlen)2) == 0) {
/* %--------------------------------------------% */
/* | Sort X 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;
}
i__2 = j;
d__1 = x[i__2].r;
d__2 = d_imag(&x[j]);
temp1 = dlapy2_(&d__1, &d__2);
i__2 = j + igap;
d__1 = x[i__2].r;
d__2 = d_imag(&x[j + igap]);
temp2 = dlapy2_(&d__1, &d__2);
if (temp1 < temp2) {
i__2 = j;
temp.r = x[i__2].r, temp.i = x[i__2].i;
i__2 = j;
i__3 = j + igap;
x[i__2].r = x[i__3].r, x[i__2].i = x[i__3].i;
i__2 = j + igap;
x[i__2].r = temp.r, x[i__2].i = temp.i;
if (*apply) {
i__2 = j;
temp.r = y[i__2].r, temp.i = y[i__2].i;
i__2 = j;
i__3 = j + igap;
y[i__2].r = y[i__3].r, y[i__2].i = y[i__3].i;
i__2 = j + igap;
y[i__2].r = temp.r, y[i__2].i = temp.i;
}
} 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;
}
i__2 = j;
i__3 = j + igap;
if (x[i__2].r > x[i__3].r) {
i__2 = j;
temp.r = x[i__2].r, temp.i = x[i__2].i;
i__2 = j;
i__3 = j + igap;
x[i__2].r = x[i__3].r, x[i__2].i = x[i__3].i;
i__2 = j + igap;
x[i__2].r = temp.r, x[i__2].i = temp.i;
if (*apply) {
i__2 = j;
temp.r = y[i__2].r, temp.i = y[i__2].i;
i__2 = j;
i__3 = j + igap;
y[i__2].r = y[i__3].r, y[i__2].i = y[i__3].i;
i__2 = j + igap;
y[i__2].r = temp.r, y[i__2].i = temp.i;
}
} 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;
}
i__2 = j;
i__3 = j + igap;
if (x[i__2].r < x[i__3].r) {
i__2 = j;
temp.r = x[i__2].r, temp.i = x[i__2].i;
i__2 = j;
i__3 = j + igap;
x[i__2].r = x[i__3].r, x[i__2].i = x[i__3].i;
i__2 = j + igap;
x[i__2].r = temp.r, x[i__2].i = temp.i;
if (*apply) {
i__2 = j;
temp.r = y[i__2].r, temp.i = y[i__2].i;
i__2 = j;
i__3 = j + igap;
y[i__2].r = y[i__3].r, y[i__2].i = y[i__3].i;
i__2 = j + igap;
y[i__2].r = temp.r, y[i__2].i = temp.i;
}
} 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 algebraic order | */
/* %--------------------------------------------% */
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_imag(&x[j]) > d_imag(&x[j + igap])) {
i__2 = j;
temp.r = x[i__2].r, temp.i = x[i__2].i;
i__2 = j;
i__3 = j + igap;
x[i__2].r = x[i__3].r, x[i__2].i = x[i__3].i;
i__2 = j + igap;
x[i__2].r = temp.r, x[i__2].i = temp.i;
if (*apply) {
i__2 = j;
temp.r = y[i__2].r, temp.i = y[i__2].i;
i__2 = j;
i__3 = j + igap;
y[i__2].r = y[i__3].r, y[i__2].i = y[i__3].i;
i__2 = j + igap;
y[i__2].r = temp.r, y[i__2].i = temp.i;
}
} 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 algebraic order | */
/* %---------------------------------------------% */
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_imag(&x[j]) < d_imag(&x[j + igap])) {
i__2 = j;
temp.r = x[i__2].r, temp.i = x[i__2].i;
i__2 = j;
i__3 = j + igap;
x[i__2].r = x[i__3].r, x[i__2].i = x[i__3].i;
i__2 = j + igap;
x[i__2].r = temp.r, x[i__2].i = temp.i;
if (*apply) {
i__2 = j;
temp.r = y[i__2].r, temp.i = y[i__2].i;
i__2 = j;
i__3 = j + igap;
y[i__2].r = y[i__3].r, y[i__2].i = y[i__3].i;
i__2 = j + igap;
y[i__2].r = temp.r, y[i__2].i = temp.i;
}
} else {
goto L180;
}
j -= igap;
goto L170;
L180:
;
}
igap /= 2;
goto L160;
}
L9000:
return 0;
/* %---------------% */
/* | End of zsortc | */
/* %---------------% */
} /* zsortc_ */
|
