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Functions
zunm2r.c File Reference

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Functions

int zunm2r_fla (char *side, char *trans, integer *m, integer *n, integer *k, doublecomplex *a, integer *lda, doublecomplex *tau, doublecomplex *c__, integer *ldc, doublecomplex *work, integer *info)
 

Function Documentation

◆ zunm2r_fla()

int zunm2r_fla ( char *  side,
char *  trans,
integer m,
integer n,
integer k,
doublecomplex a,
integer lda,
doublecomplex tau,
doublecomplex c__,
integer ldc,
doublecomplex work,
integer info 
)
152 {
153  /* System generated locals */
154  integer a_dim1, a_offset, c_dim1, c_offset, i__1, i__2, i__3;
155  doublecomplex z__1;
156  /* Builtin functions */
157  void d_cnjg(doublecomplex *, doublecomplex *);
158  /* Local variables */
159  integer i__, i1, i2, i3, ic, jc, mi, ni, nq;
160  doublecomplex aii;
161  logical left;
162  doublecomplex taui;
163  extern logical lsame_(char *, char *);
164  extern /* Subroutine */
165  int zlarf_(char *, integer *, integer *, doublecomplex *, integer *, doublecomplex *, doublecomplex *, integer *, doublecomplex *), xerbla_(char *, integer *);
166  logical notran;
167  /* -- LAPACK computational routine (version 3.4.2) -- */
168  /* -- LAPACK is a software package provided by Univ. of Tennessee, -- */
169  /* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- */
170  /* September 2012 */
171  /* .. Scalar Arguments .. */
172  /* .. */
173  /* .. Array Arguments .. */
174  /* .. */
175  /* ===================================================================== */
176  /* .. Parameters .. */
177  /* .. */
178  /* .. Local Scalars .. */
179  /* .. */
180  /* .. External Functions .. */
181  /* .. */
182  /* .. External Subroutines .. */
183  /* .. */
184  /* .. Intrinsic Functions .. */
185  /* .. */
186  /* .. Executable Statements .. */
187  /* Test the input arguments */
188  /* Parameter adjustments */
189  a_dim1 = *lda;
190  a_offset = 1 + a_dim1;
191  a -= a_offset;
192  --tau;
193  c_dim1 = *ldc;
194  c_offset = 1 + c_dim1;
195  c__ -= c_offset;
196  --work;
197  /* Function Body */
198  *info = 0;
199  left = lsame_(side, "L");
200  notran = lsame_(trans, "N");
201  /* NQ is the order of Q */
202  if (left)
203  {
204  nq = *m;
205  }
206  else
207  {
208  nq = *n;
209  }
210  if (! left && ! lsame_(side, "R"))
211  {
212  *info = -1;
213  }
214  else if (! notran && ! lsame_(trans, "C"))
215  {
216  *info = -2;
217  }
218  else if (*m < 0)
219  {
220  *info = -3;
221  }
222  else if (*n < 0)
223  {
224  *info = -4;
225  }
226  else if (*k < 0 || *k > nq)
227  {
228  *info = -5;
229  }
230  else if (*lda < max(1,nq))
231  {
232  *info = -7;
233  }
234  else if (*ldc < max(1,*m))
235  {
236  *info = -10;
237  }
238  if (*info != 0)
239  {
240  i__1 = -(*info);
241  xerbla_("ZUNM2R", &i__1);
242  return 0;
243  }
244  /* Quick return if possible */
245  if (*m == 0 || *n == 0 || *k == 0)
246  {
247  return 0;
248  }
249  if (left && ! notran || ! left && notran)
250  {
251  i1 = 1;
252  i2 = *k;
253  i3 = 1;
254  }
255  else
256  {
257  i1 = *k;
258  i2 = 1;
259  i3 = -1;
260  }
261  if (left)
262  {
263  ni = *n;
264  jc = 1;
265  }
266  else
267  {
268  mi = *m;
269  ic = 1;
270  }
271  i__1 = i2;
272  i__2 = i3;
273  for (i__ = i1;
274  i__2 < 0 ? i__ >= i__1 : i__ <= i__1;
275  i__ += i__2)
276  {
277  if (left)
278  {
279  /* H(i) or H(i)**H is applied to C(i:m,1:n) */
280  mi = *m - i__ + 1;
281  ic = i__;
282  }
283  else
284  {
285  /* H(i) or H(i)**H is applied to C(1:m,i:n) */
286  ni = *n - i__ + 1;
287  jc = i__;
288  }
289  /* Apply H(i) or H(i)**H */
290  if (notran)
291  {
292  i__3 = i__;
293  taui.r = tau[i__3].r;
294  taui.i = tau[i__3].i; // , expr subst
295  }
296  else
297  {
298  d_cnjg(&z__1, &tau[i__]);
299  taui.r = z__1.r;
300  taui.i = z__1.i; // , expr subst
301  }
302  i__3 = i__ + i__ * a_dim1;
303  aii.r = a[i__3].r;
304  aii.i = a[i__3].i; // , expr subst
305  i__3 = i__ + i__ * a_dim1;
306  a[i__3].r = 1.;
307  a[i__3].i = 0.; // , expr subst
308  zlarf_(side, &mi, &ni, &a[i__ + i__ * a_dim1], &c__1, &taui, &c__[ic + jc * c_dim1], ldc, &work[1]);
309  i__3 = i__ + i__ * a_dim1;
310  a[i__3].r = aii.r;
311  a[i__3].i = aii.i; // , expr subst
312  /* L10: */
313  }
314  return 0;
315  /* End of ZUNM2R */
316 }
int integer
Definition: FLA_f2c.h:25
int logical
Definition: FLA_f2c.h:36
Definition: FLA_f2c.h:33
doublereal i
Definition: FLA_f2c.h:33
doublereal r
Definition: FLA_f2c.h:33

References doublecomplex::i, and doublecomplex::r.

Referenced by zunmqr_fla().