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438 lines
13 KiB
438 lines
13 KiB
/* chpmv.f -- translated by f2c (version 20100827).
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You must link the resulting object file with libf2c:
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on Microsoft Windows system, link with libf2c.lib;
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on Linux or Unix systems, link with .../path/to/libf2c.a -lm
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or, if you install libf2c.a in a standard place, with -lf2c -lm
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-- in that order, at the end of the command line, as in
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cc *.o -lf2c -lm
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Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
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http://www.netlib.org/f2c/libf2c.zip
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*/
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#include "datatypes.h"
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/* Subroutine */ int chpmv_(char *uplo, integer *n, complex *alpha, complex *
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ap, complex *x, integer *incx, complex *beta, complex *y, integer *
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incy, ftnlen uplo_len)
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{
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/* System generated locals */
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integer i__1, i__2, i__3, i__4, i__5;
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real r__1;
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complex q__1, q__2, q__3, q__4;
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/* Builtin functions */
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void r_cnjg(complex *, complex *);
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/* Local variables */
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integer i__, j, k, kk, ix, iy, jx, jy, kx, ky, info;
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complex temp1, temp2;
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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extern /* Subroutine */ int xerbla_(char *, integer *, ftnlen);
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/* .. Scalar Arguments .. */
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/* .. */
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/* .. Array Arguments .. */
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/* .. */
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/* Purpose */
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/* ======= */
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/* CHPMV performs the matrix-vector operation */
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/* y := alpha*A*x + beta*y, */
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/* where alpha and beta are scalars, x and y are n element vectors and */
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/* A is an n by n hermitian matrix, supplied in packed form. */
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/* Arguments */
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/* ========== */
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/* UPLO - CHARACTER*1. */
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/* On entry, UPLO specifies whether the upper or lower */
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/* triangular part of the matrix A is supplied in the packed */
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/* array AP as follows: */
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/* UPLO = 'U' or 'u' The upper triangular part of A is */
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/* supplied in AP. */
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/* UPLO = 'L' or 'l' The lower triangular part of A is */
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/* supplied in AP. */
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/* Unchanged on exit. */
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/* N - INTEGER. */
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/* On entry, N specifies the order of the matrix A. */
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/* N must be at least zero. */
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/* Unchanged on exit. */
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/* ALPHA - COMPLEX . */
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/* On entry, ALPHA specifies the scalar alpha. */
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/* Unchanged on exit. */
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/* AP - COMPLEX array of DIMENSION at least */
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/* ( ( n*( n + 1 ) )/2 ). */
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/* Before entry with UPLO = 'U' or 'u', the array AP must */
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/* contain the upper triangular part of the hermitian matrix */
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/* packed sequentially, column by column, so that AP( 1 ) */
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/* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 ) */
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/* and a( 2, 2 ) respectively, and so on. */
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/* Before entry with UPLO = 'L' or 'l', the array AP must */
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/* contain the lower triangular part of the hermitian matrix */
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/* packed sequentially, column by column, so that AP( 1 ) */
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/* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 ) */
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/* and a( 3, 1 ) respectively, and so on. */
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/* Note that the imaginary parts of the diagonal elements need */
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/* not be set and are assumed to be zero. */
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/* Unchanged on exit. */
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/* X - COMPLEX array of dimension at least */
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/* ( 1 + ( n - 1 )*abs( INCX ) ). */
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/* Before entry, the incremented array X must contain the n */
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/* element vector x. */
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/* Unchanged on exit. */
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/* INCX - INTEGER. */
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/* On entry, INCX specifies the increment for the elements of */
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/* X. INCX must not be zero. */
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/* Unchanged on exit. */
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/* BETA - COMPLEX . */
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/* On entry, BETA specifies the scalar beta. When BETA is */
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/* supplied as zero then Y need not be set on input. */
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/* Unchanged on exit. */
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/* Y - COMPLEX array of dimension at least */
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/* ( 1 + ( n - 1 )*abs( INCY ) ). */
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/* Before entry, the incremented array Y must contain the n */
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/* element vector y. On exit, Y is overwritten by the updated */
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/* vector y. */
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/* INCY - INTEGER. */
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/* On entry, INCY specifies the increment for the elements of */
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/* Y. INCY must not be zero. */
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/* Unchanged on exit. */
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/* Further Details */
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/* =============== */
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/* Level 2 Blas routine. */
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/* -- Written on 22-October-1986. */
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/* Jack Dongarra, Argonne National Lab. */
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/* Jeremy Du Croz, Nag Central Office. */
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/* Sven Hammarling, Nag Central Office. */
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/* Richard Hanson, Sandia National Labs. */
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/* ===================================================================== */
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/* .. Parameters .. */
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/* .. */
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/* .. Local Scalars .. */
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/* .. */
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/* .. External Functions .. */
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/* .. */
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/* .. External Subroutines .. */
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/* .. */
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/* .. Intrinsic Functions .. */
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/* .. */
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/* Test the input parameters. */
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/* Parameter adjustments */
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--y;
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--x;
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--ap;
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/* Function Body */
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info = 0;
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if (! lsame_(uplo, "U", (ftnlen)1, (ftnlen)1) && ! lsame_(uplo, "L", (
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ftnlen)1, (ftnlen)1)) {
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info = 1;
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} else if (*n < 0) {
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info = 2;
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} else if (*incx == 0) {
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info = 6;
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} else if (*incy == 0) {
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info = 9;
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}
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if (info != 0) {
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xerbla_("CHPMV ", &info, (ftnlen)6);
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return 0;
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}
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/* Quick return if possible. */
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if (*n == 0 || (alpha->r == 0.f && alpha->i == 0.f && (beta->r == 1.f &&
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beta->i == 0.f))) {
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return 0;
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}
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/* Set up the start points in X and Y. */
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if (*incx > 0) {
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kx = 1;
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} else {
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kx = 1 - (*n - 1) * *incx;
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}
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if (*incy > 0) {
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ky = 1;
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} else {
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ky = 1 - (*n - 1) * *incy;
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}
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/* Start the operations. In this version the elements of the array AP */
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/* are accessed sequentially with one pass through AP. */
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/* First form y := beta*y. */
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if (beta->r != 1.f || beta->i != 0.f) {
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if (*incy == 1) {
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if (beta->r == 0.f && beta->i == 0.f) {
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i__1 = *n;
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for (i__ = 1; i__ <= i__1; ++i__) {
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i__2 = i__;
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y[i__2].r = 0.f, y[i__2].i = 0.f;
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/* L10: */
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}
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} else {
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i__1 = *n;
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for (i__ = 1; i__ <= i__1; ++i__) {
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i__2 = i__;
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i__3 = i__;
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q__1.r = beta->r * y[i__3].r - beta->i * y[i__3].i,
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q__1.i = beta->r * y[i__3].i + beta->i * y[i__3]
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.r;
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y[i__2].r = q__1.r, y[i__2].i = q__1.i;
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/* L20: */
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}
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}
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} else {
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iy = ky;
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if (beta->r == 0.f && beta->i == 0.f) {
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i__1 = *n;
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for (i__ = 1; i__ <= i__1; ++i__) {
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i__2 = iy;
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y[i__2].r = 0.f, y[i__2].i = 0.f;
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iy += *incy;
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/* L30: */
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}
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} else {
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i__1 = *n;
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for (i__ = 1; i__ <= i__1; ++i__) {
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i__2 = iy;
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i__3 = iy;
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q__1.r = beta->r * y[i__3].r - beta->i * y[i__3].i,
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q__1.i = beta->r * y[i__3].i + beta->i * y[i__3]
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.r;
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y[i__2].r = q__1.r, y[i__2].i = q__1.i;
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iy += *incy;
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/* L40: */
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}
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}
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}
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}
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if (alpha->r == 0.f && alpha->i == 0.f) {
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return 0;
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}
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kk = 1;
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if (lsame_(uplo, "U", (ftnlen)1, (ftnlen)1)) {
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/* Form y when AP contains the upper triangle. */
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if (*incx == 1 && *incy == 1) {
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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i__2 = j;
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q__1.r = alpha->r * x[i__2].r - alpha->i * x[i__2].i, q__1.i =
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alpha->r * x[i__2].i + alpha->i * x[i__2].r;
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temp1.r = q__1.r, temp1.i = q__1.i;
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temp2.r = 0.f, temp2.i = 0.f;
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k = kk;
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i__2 = j - 1;
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for (i__ = 1; i__ <= i__2; ++i__) {
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i__3 = i__;
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i__4 = i__;
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i__5 = k;
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q__2.r = temp1.r * ap[i__5].r - temp1.i * ap[i__5].i,
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q__2.i = temp1.r * ap[i__5].i + temp1.i * ap[i__5]
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.r;
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q__1.r = y[i__4].r + q__2.r, q__1.i = y[i__4].i + q__2.i;
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y[i__3].r = q__1.r, y[i__3].i = q__1.i;
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r_cnjg(&q__3, &ap[k]);
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i__3 = i__;
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q__2.r = q__3.r * x[i__3].r - q__3.i * x[i__3].i, q__2.i =
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q__3.r * x[i__3].i + q__3.i * x[i__3].r;
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q__1.r = temp2.r + q__2.r, q__1.i = temp2.i + q__2.i;
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temp2.r = q__1.r, temp2.i = q__1.i;
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++k;
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/* L50: */
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}
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i__2 = j;
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i__3 = j;
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i__4 = kk + j - 1;
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r__1 = ap[i__4].r;
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q__3.r = r__1 * temp1.r, q__3.i = r__1 * temp1.i;
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q__2.r = y[i__3].r + q__3.r, q__2.i = y[i__3].i + q__3.i;
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q__4.r = alpha->r * temp2.r - alpha->i * temp2.i, q__4.i =
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alpha->r * temp2.i + alpha->i * temp2.r;
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q__1.r = q__2.r + q__4.r, q__1.i = q__2.i + q__4.i;
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y[i__2].r = q__1.r, y[i__2].i = q__1.i;
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kk += j;
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/* L60: */
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}
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} else {
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jx = kx;
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jy = ky;
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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i__2 = jx;
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q__1.r = alpha->r * x[i__2].r - alpha->i * x[i__2].i, q__1.i =
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alpha->r * x[i__2].i + alpha->i * x[i__2].r;
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temp1.r = q__1.r, temp1.i = q__1.i;
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temp2.r = 0.f, temp2.i = 0.f;
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ix = kx;
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iy = ky;
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i__2 = kk + j - 2;
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for (k = kk; k <= i__2; ++k) {
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i__3 = iy;
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i__4 = iy;
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i__5 = k;
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q__2.r = temp1.r * ap[i__5].r - temp1.i * ap[i__5].i,
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q__2.i = temp1.r * ap[i__5].i + temp1.i * ap[i__5]
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.r;
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q__1.r = y[i__4].r + q__2.r, q__1.i = y[i__4].i + q__2.i;
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y[i__3].r = q__1.r, y[i__3].i = q__1.i;
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r_cnjg(&q__3, &ap[k]);
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i__3 = ix;
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q__2.r = q__3.r * x[i__3].r - q__3.i * x[i__3].i, q__2.i =
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q__3.r * x[i__3].i + q__3.i * x[i__3].r;
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q__1.r = temp2.r + q__2.r, q__1.i = temp2.i + q__2.i;
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temp2.r = q__1.r, temp2.i = q__1.i;
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ix += *incx;
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iy += *incy;
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/* L70: */
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}
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i__2 = jy;
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i__3 = jy;
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i__4 = kk + j - 1;
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r__1 = ap[i__4].r;
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q__3.r = r__1 * temp1.r, q__3.i = r__1 * temp1.i;
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q__2.r = y[i__3].r + q__3.r, q__2.i = y[i__3].i + q__3.i;
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q__4.r = alpha->r * temp2.r - alpha->i * temp2.i, q__4.i =
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alpha->r * temp2.i + alpha->i * temp2.r;
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q__1.r = q__2.r + q__4.r, q__1.i = q__2.i + q__4.i;
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y[i__2].r = q__1.r, y[i__2].i = q__1.i;
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jx += *incx;
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jy += *incy;
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kk += j;
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/* L80: */
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}
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}
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} else {
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/* Form y when AP contains the lower triangle. */
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if (*incx == 1 && *incy == 1) {
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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i__2 = j;
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q__1.r = alpha->r * x[i__2].r - alpha->i * x[i__2].i, q__1.i =
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alpha->r * x[i__2].i + alpha->i * x[i__2].r;
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temp1.r = q__1.r, temp1.i = q__1.i;
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temp2.r = 0.f, temp2.i = 0.f;
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i__2 = j;
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i__3 = j;
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i__4 = kk;
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r__1 = ap[i__4].r;
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q__2.r = r__1 * temp1.r, q__2.i = r__1 * temp1.i;
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q__1.r = y[i__3].r + q__2.r, q__1.i = y[i__3].i + q__2.i;
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y[i__2].r = q__1.r, y[i__2].i = q__1.i;
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k = kk + 1;
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i__2 = *n;
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for (i__ = j + 1; i__ <= i__2; ++i__) {
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i__3 = i__;
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i__4 = i__;
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i__5 = k;
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q__2.r = temp1.r * ap[i__5].r - temp1.i * ap[i__5].i,
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q__2.i = temp1.r * ap[i__5].i + temp1.i * ap[i__5]
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.r;
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q__1.r = y[i__4].r + q__2.r, q__1.i = y[i__4].i + q__2.i;
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y[i__3].r = q__1.r, y[i__3].i = q__1.i;
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r_cnjg(&q__3, &ap[k]);
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i__3 = i__;
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q__2.r = q__3.r * x[i__3].r - q__3.i * x[i__3].i, q__2.i =
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q__3.r * x[i__3].i + q__3.i * x[i__3].r;
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q__1.r = temp2.r + q__2.r, q__1.i = temp2.i + q__2.i;
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temp2.r = q__1.r, temp2.i = q__1.i;
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++k;
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/* L90: */
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}
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i__2 = j;
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i__3 = j;
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q__2.r = alpha->r * temp2.r - alpha->i * temp2.i, q__2.i =
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alpha->r * temp2.i + alpha->i * temp2.r;
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q__1.r = y[i__3].r + q__2.r, q__1.i = y[i__3].i + q__2.i;
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y[i__2].r = q__1.r, y[i__2].i = q__1.i;
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kk += *n - j + 1;
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/* L100: */
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}
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} else {
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jx = kx;
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jy = ky;
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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i__2 = jx;
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q__1.r = alpha->r * x[i__2].r - alpha->i * x[i__2].i, q__1.i =
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alpha->r * x[i__2].i + alpha->i * x[i__2].r;
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temp1.r = q__1.r, temp1.i = q__1.i;
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temp2.r = 0.f, temp2.i = 0.f;
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i__2 = jy;
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i__3 = jy;
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i__4 = kk;
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r__1 = ap[i__4].r;
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q__2.r = r__1 * temp1.r, q__2.i = r__1 * temp1.i;
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q__1.r = y[i__3].r + q__2.r, q__1.i = y[i__3].i + q__2.i;
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y[i__2].r = q__1.r, y[i__2].i = q__1.i;
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ix = jx;
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iy = jy;
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i__2 = kk + *n - j;
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for (k = kk + 1; k <= i__2; ++k) {
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ix += *incx;
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iy += *incy;
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i__3 = iy;
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i__4 = iy;
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i__5 = k;
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q__2.r = temp1.r * ap[i__5].r - temp1.i * ap[i__5].i,
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q__2.i = temp1.r * ap[i__5].i + temp1.i * ap[i__5]
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.r;
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q__1.r = y[i__4].r + q__2.r, q__1.i = y[i__4].i + q__2.i;
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y[i__3].r = q__1.r, y[i__3].i = q__1.i;
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r_cnjg(&q__3, &ap[k]);
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i__3 = ix;
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q__2.r = q__3.r * x[i__3].r - q__3.i * x[i__3].i, q__2.i =
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q__3.r * x[i__3].i + q__3.i * x[i__3].r;
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q__1.r = temp2.r + q__2.r, q__1.i = temp2.i + q__2.i;
|
|
temp2.r = q__1.r, temp2.i = q__1.i;
|
|
/* L110: */
|
|
}
|
|
i__2 = jy;
|
|
i__3 = jy;
|
|
q__2.r = alpha->r * temp2.r - alpha->i * temp2.i, q__2.i =
|
|
alpha->r * temp2.i + alpha->i * temp2.r;
|
|
q__1.r = y[i__3].r + q__2.r, q__1.i = y[i__3].i + q__2.i;
|
|
y[i__2].r = q__1.r, y[i__2].i = q__1.i;
|
|
jx += *incx;
|
|
jy += *incy;
|
|
kk += *n - j + 1;
|
|
/* L120: */
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
/* End of CHPMV . */
|
|
|
|
} /* chpmv_ */
|
|
|