78 lines
1.8 KiB
C++
78 lines
1.8 KiB
C++
#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lmp_f2c.h"
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int dger_(integer *m, integer *n, doublereal *alpha, doublereal *x, integer *incx, doublereal *y,
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integer *incy, doublereal *a, integer *lda)
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{
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integer a_dim1, a_offset, i__1, i__2;
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integer i__, j, ix, jy, kx, info;
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doublereal temp;
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extern int xerbla_(char *, integer *, ftnlen);
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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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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_((char *)"DGER ", &info, (ftnlen)6);
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return 0;
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}
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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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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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}
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}
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jy += *incy;
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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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}
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}
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jy += *incy;
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}
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}
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return 0;
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}
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#ifdef __cplusplus
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}
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#endif
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