172 integer a_dim1, a_offset, i__1, i__2, i__3;
180 extern logical lsame_(
char *,
char *);
185 int dsymv_(
char *,
integer *,
doublereal *,
doublereal *,
integer *,
doublereal *,
integer *,
doublereal *,
doublereal *,
integer *), dlarfg_(
integer *,
doublereal *,
doublereal *,
integer *,
doublereal *), xerbla_(
char *,
integer * );
209 a_offset = 1 + a_dim1;
216 upper = lsame_(uplo,
"U");
217 if (! upper && ! lsame_(uplo,
"L"))
225 else if (*lda < max(1,*n))
232 xerbla_(
"DSYTD2", &i__1);
249 dlarfg_(&i__, &a[i__ + (i__ + 1) * a_dim1], &a[(i__ + 1) * a_dim1 + 1], &c__1, &taui);
250 e[i__] = a[i__ + (i__ + 1) * a_dim1];
254 a[i__ + (i__ + 1) * a_dim1] = 1.;
256 dsymv_(uplo, &i__, &taui, &a[a_offset], lda, &a[(i__ + 1) * a_dim1 + 1], &c__1, &c_b8, &tau[1], &c__1);
258 alpha = taui * -.5 * ddot_(&i__, &tau[1], &c__1, &a[(i__ + 1) * a_dim1 + 1], &c__1);
259 daxpy_(&i__, &alpha, &a[(i__ + 1) * a_dim1 + 1], &c__1, &tau[ 1], &c__1);
262 dsyr2_(uplo, &i__, &c_b14, &a[(i__ + 1) * a_dim1 + 1], &c__1, &tau[1], &c__1, &a[a_offset], lda);
263 a[i__ + (i__ + 1) * a_dim1] = e[i__];
265 d__[i__ + 1] = a[i__ + 1 + (i__ + 1) * a_dim1];
269 d__[1] = a[a_dim1 + 1];
284 dlarfg_(&i__2, &a[i__ + 1 + i__ * a_dim1], &a[min(i__3,*n) + i__ * a_dim1], &c__1, &taui);
285 e[i__] = a[i__ + 1 + i__ * a_dim1];
289 a[i__ + 1 + i__ * a_dim1] = 1.;
292 dsymv_(uplo, &i__2, &taui, &a[i__ + 1 + (i__ + 1) * a_dim1], lda, &a[i__ + 1 + i__ * a_dim1], &c__1, &c_b8, &tau[ i__], &c__1);
295 alpha = taui * -.5 * ddot_(&i__2, &tau[i__], &c__1, &a[i__ + 1 + i__ * a_dim1], &c__1);
297 daxpy_(&i__2, &alpha, &a[i__ + 1 + i__ * a_dim1], &c__1, &tau[ i__], &c__1);
301 dsyr2_(uplo, &i__2, &c_b14, &a[i__ + 1 + i__ * a_dim1], &c__1, &tau[i__], &c__1, &a[i__ + 1 + (i__ + 1) * a_dim1], lda);
302 a[i__ + 1 + i__ * a_dim1] = e[i__];
304 d__[i__] = a[i__ + i__ * a_dim1];
308 d__[*n] = a[*n + *n * a_dim1];
double doublereal
Definition: FLA_f2c.h:31
int integer
Definition: FLA_f2c.h:25
int logical
Definition: FLA_f2c.h:36