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181 lines
4.4 KiB
C
181 lines
4.4 KiB
C
#include "clapack.h"
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/* Subroutine */ int sger_(integer *m, integer *n, real *alpha, real *x,
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integer *incx, real *y, integer *incy, real *a, integer *lda)
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{
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/* System generated locals */
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integer a_dim1, a_offset, i__1, i__2;
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/* Local variables */
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integer i__, j, ix, jy, kx, info;
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real temp;
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extern /* Subroutine */ int xerbla_(char *, integer *);
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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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/* SGER performs the rank 1 operation */
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/* A := alpha*x*y' + A, */
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/* where alpha is a scalar, x is an m element vector, y is an n element */
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/* vector and A is an m by n matrix. */
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/* Arguments */
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/* ========== */
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/* M - INTEGER. */
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/* On entry, M specifies the number of rows of the matrix A. */
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/* M must be at least zero. */
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/* Unchanged on exit. */
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/* N - INTEGER. */
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/* On entry, N specifies the number of columns 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 - REAL . */
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/* On entry, ALPHA specifies the scalar alpha. */
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/* Unchanged on exit. */
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/* X - REAL array of dimension at least */
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/* ( 1 + ( m - 1 )*abs( INCX ) ). */
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/* Before entry, the incremented array X must contain the m */
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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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/* Y - REAL 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. */
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/* Unchanged on exit. */
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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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/* A - REAL array of DIMENSION ( LDA, n ). */
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/* Before entry, the leading m by n part of the array A must */
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/* contain the matrix of coefficients. On exit, A is */
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/* overwritten by the updated matrix. */
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/* LDA - INTEGER. */
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/* On entry, LDA specifies the first dimension of A as declared */
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/* in the calling (sub) program. LDA must be at least */
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/* max( 1, m ). */
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/* Unchanged on exit. */
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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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/* .. Parameters .. */
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/* .. */
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/* .. Local Scalars .. */
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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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--x;
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--y;
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a_dim1 = *lda;
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a_offset = 1 + a_dim1;
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a -= a_offset;
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/* Function Body */
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info = 0;
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if (*m < 0) {
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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 = 5;
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} else if (*incy == 0) {
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info = 7;
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} else if (*lda < max(1,*m)) {
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info = 9;
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}
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if (info != 0) {
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xerbla_("SGER ", &info);
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return 0;
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}
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/* Quick return if possible. */
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if (*m == 0 || *n == 0 || *alpha == 0.f) {
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return 0;
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}
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/* Start the operations. In this version the elements of A are */
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/* accessed sequentially with one pass through A. */
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if (*incy > 0) {
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jy = 1;
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} else {
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jy = 1 - (*n - 1) * *incy;
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}
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if (*incx == 1) {
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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if (y[jy] != 0.f) {
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temp = *alpha * y[jy];
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i__2 = *m;
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for (i__ = 1; i__ <= i__2; ++i__) {
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a[i__ + j * a_dim1] += x[i__] * temp;
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/* L10: */
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}
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}
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jy += *incy;
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/* L20: */
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}
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} else {
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if (*incx > 0) {
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kx = 1;
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} else {
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kx = 1 - (*m - 1) * *incx;
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}
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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if (y[jy] != 0.f) {
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temp = *alpha * y[jy];
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ix = kx;
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i__2 = *m;
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for (i__ = 1; i__ <= i__2; ++i__) {
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a[i__ + j * a_dim1] += x[ix] * temp;
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ix += *incx;
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/* L30: */
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}
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}
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jy += *incy;
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/* L40: */
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}
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}
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return 0;
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/* End of SGER . */
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} /* sger_ */
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