216 lines
4.9 KiB
C
216 lines
4.9 KiB
C
/* drotm.f -- translated by f2c (version 20100827).
|
|
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 "datatypes.h"
|
|
|
|
/* Subroutine */ int drotm_(integer *n, doublereal *dx, integer *incx,
|
|
doublereal *dy, integer *incy, doublereal *dparam)
|
|
{
|
|
/* Initialized data */
|
|
|
|
static doublereal zero = 0.;
|
|
static doublereal two = 2.;
|
|
|
|
/* System generated locals */
|
|
integer i__1, i__2;
|
|
|
|
/* Local variables */
|
|
integer i__;
|
|
doublereal w, z__;
|
|
integer kx, ky;
|
|
doublereal dh11, dh12, dh21, dh22, dflag;
|
|
integer nsteps;
|
|
|
|
/* .. Scalar Arguments .. */
|
|
/* .. */
|
|
/* .. Array Arguments .. */
|
|
/* .. */
|
|
|
|
/* Purpose */
|
|
/* ======= */
|
|
|
|
/* APPLY THE MODIFIED GIVENS TRANSFORMATION, H, TO THE 2 BY N MATRIX */
|
|
|
|
/* (DX**T) , WHERE **T INDICATES TRANSPOSE. THE ELEMENTS OF DX ARE IN */
|
|
/* (DY**T) */
|
|
|
|
/* DX(LX+I*INCX), I = 0 TO N-1, WHERE LX = 1 IF INCX .GE. 0, ELSE */
|
|
/* LX = (-INCX)*N, AND SIMILARLY FOR SY USING LY AND INCY. */
|
|
/* WITH DPARAM(1)=DFLAG, H HAS ONE OF THE FOLLOWING FORMS.. */
|
|
|
|
/* DFLAG=-1.D0 DFLAG=0.D0 DFLAG=1.D0 DFLAG=-2.D0 */
|
|
|
|
/* (DH11 DH12) (1.D0 DH12) (DH11 1.D0) (1.D0 0.D0) */
|
|
/* H=( ) ( ) ( ) ( ) */
|
|
/* (DH21 DH22), (DH21 1.D0), (-1.D0 DH22), (0.D0 1.D0). */
|
|
/* SEE DROTMG FOR A DESCRIPTION OF DATA STORAGE IN DPARAM. */
|
|
|
|
/* Arguments */
|
|
/* ========= */
|
|
|
|
/* N (input) INTEGER */
|
|
/* number of elements in input vector(s) */
|
|
|
|
/* DX (input/output) DOUBLE PRECISION array, dimension N */
|
|
/* double precision vector with N elements */
|
|
|
|
/* INCX (input) INTEGER */
|
|
/* storage spacing between elements of DX */
|
|
|
|
/* DY (input/output) DOUBLE PRECISION array, dimension N */
|
|
/* double precision vector with N elements */
|
|
|
|
/* INCY (input) INTEGER */
|
|
/* storage spacing between elements of DY */
|
|
|
|
/* DPARAM (input/output) DOUBLE PRECISION array, dimension 5 */
|
|
/* DPARAM(1)=DFLAG */
|
|
/* DPARAM(2)=DH11 */
|
|
/* DPARAM(3)=DH21 */
|
|
/* DPARAM(4)=DH12 */
|
|
/* DPARAM(5)=DH22 */
|
|
|
|
/* ===================================================================== */
|
|
|
|
/* .. Local Scalars .. */
|
|
/* .. */
|
|
/* .. Data statements .. */
|
|
/* Parameter adjustments */
|
|
--dparam;
|
|
--dy;
|
|
--dx;
|
|
|
|
/* Function Body */
|
|
/* .. */
|
|
|
|
dflag = dparam[1];
|
|
if (*n <= 0 || dflag + two == zero) {
|
|
goto L140;
|
|
}
|
|
if (! (*incx == *incy && *incx > 0)) {
|
|
goto L70;
|
|
}
|
|
|
|
nsteps = *n * *incx;
|
|
if (dflag < 0.) {
|
|
goto L50;
|
|
} else if (dflag == 0) {
|
|
goto L10;
|
|
} else {
|
|
goto L30;
|
|
}
|
|
L10:
|
|
dh12 = dparam[4];
|
|
dh21 = dparam[3];
|
|
i__1 = nsteps;
|
|
i__2 = *incx;
|
|
for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
|
|
w = dx[i__];
|
|
z__ = dy[i__];
|
|
dx[i__] = w + z__ * dh12;
|
|
dy[i__] = w * dh21 + z__;
|
|
/* L20: */
|
|
}
|
|
goto L140;
|
|
L30:
|
|
dh11 = dparam[2];
|
|
dh22 = dparam[5];
|
|
i__2 = nsteps;
|
|
i__1 = *incx;
|
|
for (i__ = 1; i__1 < 0 ? i__ >= i__2 : i__ <= i__2; i__ += i__1) {
|
|
w = dx[i__];
|
|
z__ = dy[i__];
|
|
dx[i__] = w * dh11 + z__;
|
|
dy[i__] = -w + dh22 * z__;
|
|
/* L40: */
|
|
}
|
|
goto L140;
|
|
L50:
|
|
dh11 = dparam[2];
|
|
dh12 = dparam[4];
|
|
dh21 = dparam[3];
|
|
dh22 = dparam[5];
|
|
i__1 = nsteps;
|
|
i__2 = *incx;
|
|
for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
|
|
w = dx[i__];
|
|
z__ = dy[i__];
|
|
dx[i__] = w * dh11 + z__ * dh12;
|
|
dy[i__] = w * dh21 + z__ * dh22;
|
|
/* L60: */
|
|
}
|
|
goto L140;
|
|
L70:
|
|
kx = 1;
|
|
ky = 1;
|
|
if (*incx < 0) {
|
|
kx = (1 - *n) * *incx + 1;
|
|
}
|
|
if (*incy < 0) {
|
|
ky = (1 - *n) * *incy + 1;
|
|
}
|
|
|
|
if (dflag < 0.) {
|
|
goto L120;
|
|
} else if (dflag == 0) {
|
|
goto L80;
|
|
} else {
|
|
goto L100;
|
|
}
|
|
L80:
|
|
dh12 = dparam[4];
|
|
dh21 = dparam[3];
|
|
i__2 = *n;
|
|
for (i__ = 1; i__ <= i__2; ++i__) {
|
|
w = dx[kx];
|
|
z__ = dy[ky];
|
|
dx[kx] = w + z__ * dh12;
|
|
dy[ky] = w * dh21 + z__;
|
|
kx += *incx;
|
|
ky += *incy;
|
|
/* L90: */
|
|
}
|
|
goto L140;
|
|
L100:
|
|
dh11 = dparam[2];
|
|
dh22 = dparam[5];
|
|
i__2 = *n;
|
|
for (i__ = 1; i__ <= i__2; ++i__) {
|
|
w = dx[kx];
|
|
z__ = dy[ky];
|
|
dx[kx] = w * dh11 + z__;
|
|
dy[ky] = -w + dh22 * z__;
|
|
kx += *incx;
|
|
ky += *incy;
|
|
/* L110: */
|
|
}
|
|
goto L140;
|
|
L120:
|
|
dh11 = dparam[2];
|
|
dh12 = dparam[4];
|
|
dh21 = dparam[3];
|
|
dh22 = dparam[5];
|
|
i__2 = *n;
|
|
for (i__ = 1; i__ <= i__2; ++i__) {
|
|
w = dx[kx];
|
|
z__ = dy[ky];
|
|
dx[kx] = w * dh11 + z__ * dh12;
|
|
dy[ky] = w * dh21 + z__ * dh22;
|
|
kx += *incx;
|
|
ky += *incy;
|
|
/* L130: */
|
|
}
|
|
L140:
|
|
return 0;
|
|
} /* drotm_ */
|
|
|