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181 lines
4.4 KiB
181 lines
4.4 KiB
#include "clapack.h" |
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/* Subroutine */ int dger_(integer *m, integer *n, doublereal *alpha, |
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doublereal *x, integer *incx, doublereal *y, integer *incy, |
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doublereal *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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doublereal 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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/* DGER 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 - DOUBLE PRECISION. */ |
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/* On entry, ALPHA specifies the scalar alpha. */ |
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/* Unchanged on exit. */ |
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/* X - DOUBLE PRECISION 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 - DOUBLE PRECISION 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 - DOUBLE PRECISION 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_("DGER ", &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.) { |
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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.) { |
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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.) { |
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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 DGER . */ |
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} /* dger_ */
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