172 integer a_dim1, a_offset, i__1, i__2, i__3;
180 extern logical lsame_(
char *,
char *);
183 int saxpy_(
integer *,
real *,
real *,
integer *,
real *,
integer *), ssymv_(
char *,
integer *,
real *,
real *,
integer *,
real *,
integer *,
real *,
real *,
integer *), xerbla_(
char *,
integer *), slarfg_(
integer *,
real *,
real *,
integer *,
real *);
207 a_offset = 1 + a_dim1;
214 upper = lsame_(uplo,
"U");
215 if (! upper && ! lsame_(uplo,
"L"))
223 else if (*lda < max(1,*n))
230 xerbla_(
"SSYTD2", &i__1);
247 slarfg_(&i__, &a[i__ + (i__ + 1) * a_dim1], &a[(i__ + 1) * a_dim1 + 1], &c__1, &taui);
248 e[i__] = a[i__ + (i__ + 1) * a_dim1];
252 a[i__ + (i__ + 1) * a_dim1] = 1.f;
254 ssymv_(uplo, &i__, &taui, &a[a_offset], lda, &a[(i__ + 1) * a_dim1 + 1], &c__1, &c_b8, &tau[1], &c__1);
256 alpha = taui * -.5f * sdot_(&i__, &tau[1], &c__1, &a[(i__ + 1) * a_dim1 + 1], &c__1);
257 saxpy_(&i__, &alpha, &a[(i__ + 1) * a_dim1 + 1], &c__1, &tau[ 1], &c__1);
260 ssyr2_(uplo, &i__, &c_b14, &a[(i__ + 1) * a_dim1 + 1], &c__1, &tau[1], &c__1, &a[a_offset], lda);
261 a[i__ + (i__ + 1) * a_dim1] = e[i__];
263 d__[i__ + 1] = a[i__ + 1 + (i__ + 1) * a_dim1];
267 d__[1] = a[a_dim1 + 1];
282 slarfg_(&i__2, &a[i__ + 1 + i__ * a_dim1], &a[min(i__3,*n) + i__ * a_dim1], &c__1, &taui);
283 e[i__] = a[i__ + 1 + i__ * a_dim1];
287 a[i__ + 1 + i__ * a_dim1] = 1.f;
290 ssymv_(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);
293 alpha = taui * -.5f * sdot_(&i__2, &tau[i__], &c__1, &a[i__ + 1 + i__ * a_dim1], &c__1);
295 saxpy_(&i__2, &alpha, &a[i__ + 1 + i__ * a_dim1], &c__1, &tau[ i__], &c__1);
299 ssyr2_(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);
300 a[i__ + 1 + i__ * a_dim1] = e[i__];
302 d__[i__] = a[i__ + i__ * a_dim1];
306 d__[*n] = a[*n + *n * a_dim1];
int integer
Definition: FLA_f2c.h:25
int logical
Definition: FLA_f2c.h:36
float real
Definition: FLA_f2c.h:30