14 typedef long long BLASLONG;
15 typedef unsigned long long BLASULONG;
17 typedef long BLASLONG;
18 typedef unsigned long BLASULONG;
22 typedef BLASLONG blasint;
24 #define blasabs(x) llabs(x)
26 #define blasabs(x) labs(x)
30 #define blasabs(x) abs(x)
33 typedef blasint integer;
35 typedef unsigned int uinteger;
36 typedef char *address;
37 typedef short int shortint;
39 typedef double doublereal;
40 typedef struct { real r, i; } complex;
41 typedef struct { doublereal r, i; } doublecomplex;
43 static inline _Fcomplex Cf(complex *z) {_Fcomplex zz={z->r , z->i}; return zz;}
44 static inline _Dcomplex Cd(doublecomplex *z) {_Dcomplex zz={z->r , z->i};return zz;}
45 static inline _Fcomplex * _pCf(complex *z) {return (_Fcomplex*)z;}
46 static inline _Dcomplex * _pCd(doublecomplex *z) {return (_Dcomplex*)z;}
48 static inline _Complex float Cf(complex *z) {return z->r + z->i*_Complex_I;}
49 static inline _Complex double Cd(doublecomplex *z) {return z->r + z->i*_Complex_I;}
50 static inline _Complex float * _pCf(complex *z) {return (_Complex float*)z;}
51 static inline _Complex double * _pCd(doublecomplex *z) {return (_Complex double*)z;}
53 #define pCf(z) (*_pCf(z))
54 #define pCd(z) (*_pCd(z))
56 typedef short int shortlogical;
57 typedef char logical1;
58 typedef char integer1;
63 /* Extern is for use with -E */
74 /*external read, write*/
83 /*internal read, write*/
113 /*rewind, backspace, endfile*/
125 ftnint *inex; /*parameters in standard's order*/
151 union Multitype { /* for multiple entry points */
162 typedef union Multitype Multitype;
164 struct Vardesc { /* for Namelist */
170 typedef struct Vardesc Vardesc;
177 typedef struct Namelist Namelist;
179 #define abs(x) ((x) >= 0 ? (x) : -(x))
180 #define dabs(x) (fabs(x))
181 #define f2cmin(a,b) ((a) <= (b) ? (a) : (b))
182 #define f2cmax(a,b) ((a) >= (b) ? (a) : (b))
183 #define dmin(a,b) (f2cmin(a,b))
184 #define dmax(a,b) (f2cmax(a,b))
185 #define bit_test(a,b) ((a) >> (b) & 1)
186 #define bit_clear(a,b) ((a) & ~((uinteger)1 << (b)))
187 #define bit_set(a,b) ((a) | ((uinteger)1 << (b)))
189 #define abort_() { sig_die("Fortran abort routine called", 1); }
190 #define c_abs(z) (cabsf(Cf(z)))
191 #define c_cos(R,Z) { pCf(R)=ccos(Cf(Z)); }
193 #define c_div(c, a, b) {Cf(c)._Val[0] = (Cf(a)._Val[0]/Cf(b)._Val[0]); Cf(c)._Val[1]=(Cf(a)._Val[1]/Cf(b)._Val[1]);}
194 #define z_div(c, a, b) {Cd(c)._Val[0] = (Cd(a)._Val[0]/Cd(b)._Val[0]); Cd(c)._Val[1]=(Cd(a)._Val[1]/Cd(b)._Val[1]);}
196 #define c_div(c, a, b) {pCf(c) = Cf(a)/Cf(b);}
197 #define z_div(c, a, b) {pCd(c) = Cd(a)/Cd(b);}
199 #define c_exp(R, Z) {pCf(R) = cexpf(Cf(Z));}
200 #define c_log(R, Z) {pCf(R) = clogf(Cf(Z));}
201 #define c_sin(R, Z) {pCf(R) = csinf(Cf(Z));}
202 //#define c_sqrt(R, Z) {*(R) = csqrtf(Cf(Z));}
203 #define c_sqrt(R, Z) {pCf(R) = csqrtf(Cf(Z));}
204 #define d_abs(x) (fabs(*(x)))
205 #define d_acos(x) (acos(*(x)))
206 #define d_asin(x) (asin(*(x)))
207 #define d_atan(x) (atan(*(x)))
208 #define d_atn2(x, y) (atan2(*(x),*(y)))
209 #define d_cnjg(R, Z) { pCd(R) = conj(Cd(Z)); }
210 #define r_cnjg(R, Z) { pCf(R) = conjf(Cf(Z)); }
211 #define d_cos(x) (cos(*(x)))
212 #define d_cosh(x) (cosh(*(x)))
213 #define d_dim(__a, __b) ( *(__a) > *(__b) ? *(__a) - *(__b) : 0.0 )
214 #define d_exp(x) (exp(*(x)))
215 #define d_imag(z) (cimag(Cd(z)))
216 #define r_imag(z) (cimagf(Cf(z)))
217 #define d_int(__x) (*(__x)>0 ? floor(*(__x)) : -floor(- *(__x)))
218 #define r_int(__x) (*(__x)>0 ? floor(*(__x)) : -floor(- *(__x)))
219 #define d_lg10(x) ( 0.43429448190325182765 * log(*(x)) )
220 #define r_lg10(x) ( 0.43429448190325182765 * log(*(x)) )
221 #define d_log(x) (log(*(x)))
222 #define d_mod(x, y) (fmod(*(x), *(y)))
223 #define u_nint(__x) ((__x)>=0 ? floor((__x) + .5) : -floor(.5 - (__x)))
224 #define d_nint(x) u_nint(*(x))
225 #define u_sign(__a,__b) ((__b) >= 0 ? ((__a) >= 0 ? (__a) : -(__a)) : -((__a) >= 0 ? (__a) : -(__a)))
226 #define d_sign(a,b) u_sign(*(a),*(b))
227 #define r_sign(a,b) u_sign(*(a),*(b))
228 #define d_sin(x) (sin(*(x)))
229 #define d_sinh(x) (sinh(*(x)))
230 #define d_sqrt(x) (sqrt(*(x)))
231 #define d_tan(x) (tan(*(x)))
232 #define d_tanh(x) (tanh(*(x)))
233 #define i_abs(x) abs(*(x))
234 #define i_dnnt(x) ((integer)u_nint(*(x)))
235 #define i_len(s, n) (n)
236 #define i_nint(x) ((integer)u_nint(*(x)))
237 #define i_sign(a,b) ((integer)u_sign((integer)*(a),(integer)*(b)))
238 #define pow_dd(ap, bp) ( pow(*(ap), *(bp)))
239 #define pow_si(B,E) spow_ui(*(B),*(E))
240 #define pow_ri(B,E) spow_ui(*(B),*(E))
241 #define pow_di(B,E) dpow_ui(*(B),*(E))
242 #define pow_zi(p, a, b) {pCd(p) = zpow_ui(Cd(a), *(b));}
243 #define pow_ci(p, a, b) {pCf(p) = cpow_ui(Cf(a), *(b));}
244 #define pow_zz(R,A,B) {pCd(R) = cpow(Cd(A),*(B));}
245 #define s_cat(lpp, rpp, rnp, np, llp) { ftnlen i, nc, ll; char *f__rp, *lp; ll = (llp); lp = (lpp); for(i=0; i < (int)*(np); ++i) { nc = ll; if((rnp)[i] < nc) nc = (rnp)[i]; ll -= nc; f__rp = (rpp)[i]; while(--nc >= 0) *lp++ = *(f__rp)++; } while(--ll >= 0) *lp++ = ' '; }
246 #define s_cmp(a,b,c,d) ((integer)strncmp((a),(b),f2cmin((c),(d))))
247 #define s_copy(A,B,C,D) { int __i,__m; for (__i=0, __m=f2cmin((C),(D)); __i<__m && (B)[__i] != 0; ++__i) (A)[__i] = (B)[__i]; }
248 #define sig_die(s, kill) { exit(1); }
249 #define s_stop(s, n) {exit(0);}
250 static char junk[] = "\n@(#)LIBF77 VERSION 19990503\n";
251 #define z_abs(z) (cabs(Cd(z)))
252 #define z_exp(R, Z) {pCd(R) = cexp(Cd(Z));}
253 #define z_sqrt(R, Z) {pCd(R) = csqrt(Cd(Z));}
254 #define myexit_() break;
255 #define mycycle() continue;
256 #define myceiling(w) {ceil(w)}
257 #define myhuge(w) {HUGE_VAL}
258 //#define mymaxloc_(w,s,e,n) {if (sizeof(*(w)) == sizeof(double)) dmaxloc_((w),*(s),*(e),n); else dmaxloc_((w),*(s),*(e),n);}
259 #define mymaxloc(w,s,e,n) {dmaxloc_(w,*(s),*(e),n)}
261 /* procedure parameter types for -A and -C++ */
263 #define F2C_proc_par_types 1
265 typedef logical (*L_fp)(...);
267 typedef logical (*L_fp)();
270 static float spow_ui(float x, integer n) {
271 float pow=1.0; unsigned long int u;
273 if(n < 0) n = -n, x = 1/x;
282 static double dpow_ui(double x, integer n) {
283 double pow=1.0; unsigned long int u;
285 if(n < 0) n = -n, x = 1/x;
295 static _Fcomplex cpow_ui(complex x, integer n) {
296 complex pow={1.0,0.0}; unsigned long int u;
298 if(n < 0) n = -n, x.r = 1/x.r, x.i=1/x.i;
300 if(u & 01) pow.r *= x.r, pow.i *= x.i;
301 if(u >>= 1) x.r *= x.r, x.i *= x.i;
305 _Fcomplex p={pow.r, pow.i};
309 static _Complex float cpow_ui(_Complex float x, integer n) {
310 _Complex float pow=1.0; unsigned long int u;
312 if(n < 0) n = -n, x = 1/x;
323 static _Dcomplex zpow_ui(_Dcomplex x, integer n) {
324 _Dcomplex pow={1.0,0.0}; unsigned long int u;
326 if(n < 0) n = -n, x._Val[0] = 1/x._Val[0], x._Val[1] =1/x._Val[1];
328 if(u & 01) pow._Val[0] *= x._Val[0], pow._Val[1] *= x._Val[1];
329 if(u >>= 1) x._Val[0] *= x._Val[0], x._Val[1] *= x._Val[1];
333 _Dcomplex p = {pow._Val[0], pow._Val[1]};
337 static _Complex double zpow_ui(_Complex double x, integer n) {
338 _Complex double pow=1.0; unsigned long int u;
340 if(n < 0) n = -n, x = 1/x;
350 static integer pow_ii(integer x, integer n) {
351 integer pow; unsigned long int u;
353 if (n == 0 || x == 1) pow = 1;
354 else if (x != -1) pow = x == 0 ? 1/x : 0;
357 if ((n > 0) || !(n == 0 || x == 1 || x != -1)) {
367 static integer dmaxloc_(double *w, integer s, integer e, integer *n)
369 double m; integer i, mi;
370 for(m=w[s-1], mi=s, i=s+1; i<=e; i++)
371 if (w[i-1]>m) mi=i ,m=w[i-1];
374 static integer smaxloc_(float *w, integer s, integer e, integer *n)
376 float m; integer i, mi;
377 for(m=w[s-1], mi=s, i=s+1; i<=e; i++)
378 if (w[i-1]>m) mi=i ,m=w[i-1];
381 static inline void cdotc_(complex *z, integer *n_, complex *x, integer *incx_, complex *y, integer *incy_) {
382 integer n = *n_, incx = *incx_, incy = *incy_, i;
384 _Fcomplex zdotc = {0.0, 0.0};
385 if (incx == 1 && incy == 1) {
386 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
387 zdotc._Val[0] += conjf(Cf(&x[i]))._Val[0] * Cf(&y[i])._Val[0];
388 zdotc._Val[1] += conjf(Cf(&x[i]))._Val[1] * Cf(&y[i])._Val[1];
391 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
392 zdotc._Val[0] += conjf(Cf(&x[i*incx]))._Val[0] * Cf(&y[i*incy])._Val[0];
393 zdotc._Val[1] += conjf(Cf(&x[i*incx]))._Val[1] * Cf(&y[i*incy])._Val[1];
399 _Complex float zdotc = 0.0;
400 if (incx == 1 && incy == 1) {
401 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
402 zdotc += conjf(Cf(&x[i])) * Cf(&y[i]);
405 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
406 zdotc += conjf(Cf(&x[i*incx])) * Cf(&y[i*incy]);
412 static inline void zdotc_(doublecomplex *z, integer *n_, doublecomplex *x, integer *incx_, doublecomplex *y, integer *incy_) {
413 integer n = *n_, incx = *incx_, incy = *incy_, i;
415 _Dcomplex zdotc = {0.0, 0.0};
416 if (incx == 1 && incy == 1) {
417 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
418 zdotc._Val[0] += conj(Cd(&x[i]))._Val[0] * Cd(&y[i])._Val[0];
419 zdotc._Val[1] += conj(Cd(&x[i]))._Val[1] * Cd(&y[i])._Val[1];
422 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
423 zdotc._Val[0] += conj(Cd(&x[i*incx]))._Val[0] * Cd(&y[i*incy])._Val[0];
424 zdotc._Val[1] += conj(Cd(&x[i*incx]))._Val[1] * Cd(&y[i*incy])._Val[1];
430 _Complex double zdotc = 0.0;
431 if (incx == 1 && incy == 1) {
432 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
433 zdotc += conj(Cd(&x[i])) * Cd(&y[i]);
436 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
437 zdotc += conj(Cd(&x[i*incx])) * Cd(&y[i*incy]);
443 static inline void cdotu_(complex *z, integer *n_, complex *x, integer *incx_, complex *y, integer *incy_) {
444 integer n = *n_, incx = *incx_, incy = *incy_, i;
446 _Fcomplex zdotc = {0.0, 0.0};
447 if (incx == 1 && incy == 1) {
448 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
449 zdotc._Val[0] += Cf(&x[i])._Val[0] * Cf(&y[i])._Val[0];
450 zdotc._Val[1] += Cf(&x[i])._Val[1] * Cf(&y[i])._Val[1];
453 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
454 zdotc._Val[0] += Cf(&x[i*incx])._Val[0] * Cf(&y[i*incy])._Val[0];
455 zdotc._Val[1] += Cf(&x[i*incx])._Val[1] * Cf(&y[i*incy])._Val[1];
461 _Complex float zdotc = 0.0;
462 if (incx == 1 && incy == 1) {
463 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
464 zdotc += Cf(&x[i]) * Cf(&y[i]);
467 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
468 zdotc += Cf(&x[i*incx]) * Cf(&y[i*incy]);
474 static inline void zdotu_(doublecomplex *z, integer *n_, doublecomplex *x, integer *incx_, doublecomplex *y, integer *incy_) {
475 integer n = *n_, incx = *incx_, incy = *incy_, i;
477 _Dcomplex zdotc = {0.0, 0.0};
478 if (incx == 1 && incy == 1) {
479 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
480 zdotc._Val[0] += Cd(&x[i])._Val[0] * Cd(&y[i])._Val[0];
481 zdotc._Val[1] += Cd(&x[i])._Val[1] * Cd(&y[i])._Val[1];
484 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
485 zdotc._Val[0] += Cd(&x[i*incx])._Val[0] * Cd(&y[i*incy])._Val[0];
486 zdotc._Val[1] += Cd(&x[i*incx])._Val[1] * Cd(&y[i*incy])._Val[1];
492 _Complex double zdotc = 0.0;
493 if (incx == 1 && incy == 1) {
494 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
495 zdotc += Cd(&x[i]) * Cd(&y[i]);
498 for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
499 zdotc += Cd(&x[i*incx]) * Cd(&y[i*incy]);
505 /* -- translated by f2c (version 20000121).
506 You must link the resulting object file with the libraries:
507 -lf2c -lm (in that order)
513 /* Table of constant values */
515 static integer c__1 = 1;
516 static doublecomplex c_b6 = {-1.,0.};
517 static doublecomplex c_b8 = {1.,0.};
518 static doublereal c_b31 = 1.;
520 /* > \brief \b ZLA_GBRFSX_EXTENDED improves the computed solution to a system of linear equations for general
521 banded matrices by performing extra-precise iterative refinement and provides error bounds and backwar
522 d error estimates for the solution. */
524 /* =========== DOCUMENTATION =========== */
526 /* Online html documentation available at */
527 /* http://www.netlib.org/lapack/explore-html/ */
530 /* > Download ZLA_GBRFSX_EXTENDED + dependencies */
531 /* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zla_gbr
534 /* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zla_gbr
537 /* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zla_gbr
545 /* SUBROUTINE ZLA_GBRFSX_EXTENDED( PREC_TYPE, TRANS_TYPE, N, KL, KU, */
546 /* NRHS, AB, LDAB, AFB, LDAFB, IPIV, */
547 /* COLEQU, C, B, LDB, Y, LDY, */
548 /* BERR_OUT, N_NORMS, ERR_BNDS_NORM, */
549 /* ERR_BNDS_COMP, RES, AYB, DY, */
550 /* Y_TAIL, RCOND, ITHRESH, RTHRESH, */
551 /* DZ_UB, IGNORE_CWISE, INFO ) */
553 /* INTEGER INFO, LDAB, LDAFB, LDB, LDY, N, KL, KU, NRHS, */
554 /* $ PREC_TYPE, TRANS_TYPE, N_NORMS, ITHRESH */
555 /* LOGICAL COLEQU, IGNORE_CWISE */
556 /* DOUBLE PRECISION RTHRESH, DZ_UB */
557 /* INTEGER IPIV( * ) */
558 /* COMPLEX*16 AB( LDAB, * ), AFB( LDAFB, * ), B( LDB, * ), */
559 /* $ Y( LDY, * ), RES( * ), DY( * ), Y_TAIL( * ) */
560 /* DOUBLE PRECISION C( * ), AYB(*), RCOND, BERR_OUT( * ), */
561 /* $ ERR_BNDS_NORM( NRHS, * ), */
562 /* $ ERR_BNDS_COMP( NRHS, * ) */
565 /* > \par Purpose: */
570 /* > ZLA_GBRFSX_EXTENDED improves the computed solution to a system of */
571 /* > linear equations by performing extra-precise iterative refinement */
572 /* > and provides error bounds and backward error estimates for the solution. */
573 /* > This subroutine is called by ZGBRFSX to perform iterative refinement. */
574 /* > In addition to normwise error bound, the code provides maximum */
575 /* > componentwise error bound if possible. See comments for ERR_BNDS_NORM */
576 /* > and ERR_BNDS_COMP for details of the error bounds. Note that this */
577 /* > subroutine is only resonsible for setting the second fields of */
578 /* > ERR_BNDS_NORM and ERR_BNDS_COMP. */
584 /* > \param[in] PREC_TYPE */
586 /* > PREC_TYPE is INTEGER */
587 /* > Specifies the intermediate precision to be used in refinement. */
588 /* > The value is defined by ILAPREC(P) where P is a CHARACTER and P */
589 /* > = 'S': Single */
590 /* > = 'D': Double */
591 /* > = 'I': Indigenous */
592 /* > = 'X' or 'E': Extra */
595 /* > \param[in] TRANS_TYPE */
597 /* > TRANS_TYPE is INTEGER */
598 /* > Specifies the transposition operation on A. */
599 /* > The value is defined by ILATRANS(T) where T is a CHARACTER and T */
600 /* > = 'N': No transpose */
601 /* > = 'T': Transpose */
602 /* > = 'C': Conjugate transpose */
608 /* > The number of linear equations, i.e., the order of the */
609 /* > matrix A. N >= 0. */
612 /* > \param[in] KL */
614 /* > KL is INTEGER */
615 /* > The number of subdiagonals within the band of A. KL >= 0. */
618 /* > \param[in] KU */
620 /* > KU is INTEGER */
621 /* > The number of superdiagonals within the band of A. KU >= 0 */
624 /* > \param[in] NRHS */
626 /* > NRHS is INTEGER */
627 /* > The number of right-hand-sides, i.e., the number of columns of the */
631 /* > \param[in] AB */
633 /* > AB is COMPLEX*16 array, dimension (LDAB,N) */
634 /* > On entry, the N-by-N matrix A. */
637 /* > \param[in] LDAB */
639 /* > LDAB is INTEGER */
640 /* > The leading dimension of the array A. LDAB >= f2cmax(1,N). */
643 /* > \param[in] AFB */
645 /* > AFB is COMPLEX*16 array, dimension (LDAF,N) */
646 /* > The factors L and U from the factorization */
647 /* > A = P*L*U as computed by ZGBTRF. */
650 /* > \param[in] LDAFB */
652 /* > LDAFB is INTEGER */
653 /* > The leading dimension of the array AF. LDAF >= f2cmax(1,N). */
656 /* > \param[in] IPIV */
658 /* > IPIV is INTEGER array, dimension (N) */
659 /* > The pivot indices from the factorization A = P*L*U */
660 /* > as computed by ZGBTRF; row i of the matrix was interchanged */
661 /* > with row IPIV(i). */
664 /* > \param[in] COLEQU */
666 /* > COLEQU is LOGICAL */
667 /* > If .TRUE. then column equilibration was done to A before calling */
668 /* > this routine. This is needed to compute the solution and error */
669 /* > bounds correctly. */
674 /* > C is DOUBLE PRECISION array, dimension (N) */
675 /* > The column scale factors for A. If COLEQU = .FALSE., C */
676 /* > is not accessed. If C is input, each element of C should be a power */
677 /* > of the radix to ensure a reliable solution and error estimates. */
678 /* > Scaling by powers of the radix does not cause rounding errors unless */
679 /* > the result underflows or overflows. Rounding errors during scaling */
680 /* > lead to refining with a matrix that is not equivalent to the */
681 /* > input matrix, producing error estimates that may not be */
687 /* > B is COMPLEX*16 array, dimension (LDB,NRHS) */
688 /* > The right-hand-side matrix B. */
691 /* > \param[in] LDB */
693 /* > LDB is INTEGER */
694 /* > The leading dimension of the array B. LDB >= f2cmax(1,N). */
697 /* > \param[in,out] Y */
699 /* > Y is COMPLEX*16 array, dimension (LDY,NRHS) */
700 /* > On entry, the solution matrix X, as computed by ZGBTRS. */
701 /* > On exit, the improved solution matrix Y. */
704 /* > \param[in] LDY */
706 /* > LDY is INTEGER */
707 /* > The leading dimension of the array Y. LDY >= f2cmax(1,N). */
710 /* > \param[out] BERR_OUT */
712 /* > BERR_OUT is DOUBLE PRECISION array, dimension (NRHS) */
713 /* > On exit, BERR_OUT(j) contains the componentwise relative backward */
714 /* > error for right-hand-side j from the formula */
715 /* > f2cmax(i) ( abs(RES(i)) / ( abs(op(A_s))*abs(Y) + abs(B_s) )(i) ) */
716 /* > where abs(Z) is the componentwise absolute value of the matrix */
717 /* > or vector Z. This is computed by ZLA_LIN_BERR. */
720 /* > \param[in] N_NORMS */
722 /* > N_NORMS is INTEGER */
723 /* > Determines which error bounds to return (see ERR_BNDS_NORM */
724 /* > and ERR_BNDS_COMP). */
725 /* > If N_NORMS >= 1 return normwise error bounds. */
726 /* > If N_NORMS >= 2 return componentwise error bounds. */
729 /* > \param[in,out] ERR_BNDS_NORM */
731 /* > ERR_BNDS_NORM is DOUBLE PRECISION array, dimension (NRHS, N_ERR_BNDS) */
732 /* > For each right-hand side, this array contains information about */
733 /* > various error bounds and condition numbers corresponding to the */
734 /* > normwise relative error, which is defined as follows: */
736 /* > Normwise relative error in the ith solution vector: */
737 /* > max_j (abs(XTRUE(j,i) - X(j,i))) */
738 /* > ------------------------------ */
739 /* > max_j abs(X(j,i)) */
741 /* > The array is indexed by the type of error information as described */
742 /* > below. There currently are up to three pieces of information */
745 /* > The first index in ERR_BNDS_NORM(i,:) corresponds to the ith */
746 /* > right-hand side. */
748 /* > The second index in ERR_BNDS_NORM(:,err) contains the following */
749 /* > three fields: */
750 /* > err = 1 "Trust/don't trust" boolean. Trust the answer if the */
751 /* > reciprocal condition number is less than the threshold */
752 /* > sqrt(n) * slamch('Epsilon'). */
754 /* > err = 2 "Guaranteed" error bound: The estimated forward error, */
755 /* > almost certainly within a factor of 10 of the true error */
756 /* > so long as the next entry is greater than the threshold */
757 /* > sqrt(n) * slamch('Epsilon'). This error bound should only */
758 /* > be trusted if the previous boolean is true. */
760 /* > err = 3 Reciprocal condition number: Estimated normwise */
761 /* > reciprocal condition number. Compared with the threshold */
762 /* > sqrt(n) * slamch('Epsilon') to determine if the error */
763 /* > estimate is "guaranteed". These reciprocal condition */
764 /* > numbers are 1 / (norm(Z^{-1},inf) * norm(Z,inf)) for some */
765 /* > appropriately scaled matrix Z. */
766 /* > Let Z = S*A, where S scales each row by a power of the */
767 /* > radix so all absolute row sums of Z are approximately 1. */
769 /* > This subroutine is only responsible for setting the second field */
771 /* > See Lapack Working Note 165 for further details and extra */
775 /* > \param[in,out] ERR_BNDS_COMP */
777 /* > ERR_BNDS_COMP is DOUBLE PRECISION array, dimension (NRHS, N_ERR_BNDS) */
778 /* > For each right-hand side, this array contains information about */
779 /* > various error bounds and condition numbers corresponding to the */
780 /* > componentwise relative error, which is defined as follows: */
782 /* > Componentwise relative error in the ith solution vector: */
783 /* > abs(XTRUE(j,i) - X(j,i)) */
784 /* > max_j ---------------------- */
787 /* > The array is indexed by the right-hand side i (on which the */
788 /* > componentwise relative error depends), and the type of error */
789 /* > information as described below. There currently are up to three */
790 /* > pieces of information returned for each right-hand side. If */
791 /* > componentwise accuracy is not requested (PARAMS(3) = 0.0), then */
792 /* > ERR_BNDS_COMP is not accessed. If N_ERR_BNDS < 3, then at most */
793 /* > the first (:,N_ERR_BNDS) entries are returned. */
795 /* > The first index in ERR_BNDS_COMP(i,:) corresponds to the ith */
796 /* > right-hand side. */
798 /* > The second index in ERR_BNDS_COMP(:,err) contains the following */
799 /* > three fields: */
800 /* > err = 1 "Trust/don't trust" boolean. Trust the answer if the */
801 /* > reciprocal condition number is less than the threshold */
802 /* > sqrt(n) * slamch('Epsilon'). */
804 /* > err = 2 "Guaranteed" error bound: The estimated forward error, */
805 /* > almost certainly within a factor of 10 of the true error */
806 /* > so long as the next entry is greater than the threshold */
807 /* > sqrt(n) * slamch('Epsilon'). This error bound should only */
808 /* > be trusted if the previous boolean is true. */
810 /* > err = 3 Reciprocal condition number: Estimated componentwise */
811 /* > reciprocal condition number. Compared with the threshold */
812 /* > sqrt(n) * slamch('Epsilon') to determine if the error */
813 /* > estimate is "guaranteed". These reciprocal condition */
814 /* > numbers are 1 / (norm(Z^{-1},inf) * norm(Z,inf)) for some */
815 /* > appropriately scaled matrix Z. */
816 /* > Let Z = S*(A*diag(x)), where x is the solution for the */
817 /* > current right-hand side and S scales each row of */
818 /* > A*diag(x) by a power of the radix so all absolute row */
819 /* > sums of Z are approximately 1. */
821 /* > This subroutine is only responsible for setting the second field */
823 /* > See Lapack Working Note 165 for further details and extra */
827 /* > \param[in] RES */
829 /* > RES is COMPLEX*16 array, dimension (N) */
830 /* > Workspace to hold the intermediate residual. */
833 /* > \param[in] AYB */
835 /* > AYB is DOUBLE PRECISION array, dimension (N) */
839 /* > \param[in] DY */
841 /* > DY is COMPLEX*16 array, dimension (N) */
842 /* > Workspace to hold the intermediate solution. */
845 /* > \param[in] Y_TAIL */
847 /* > Y_TAIL is COMPLEX*16 array, dimension (N) */
848 /* > Workspace to hold the trailing bits of the intermediate solution. */
851 /* > \param[in] RCOND */
853 /* > RCOND is DOUBLE PRECISION */
854 /* > Reciprocal scaled condition number. This is an estimate of the */
855 /* > reciprocal Skeel condition number of the matrix A after */
856 /* > equilibration (if done). If this is less than the machine */
857 /* > precision (in particular, if it is zero), the matrix is singular */
858 /* > to working precision. Note that the error may still be small even */
859 /* > if this number is very small and the matrix appears ill- */
863 /* > \param[in] ITHRESH */
865 /* > ITHRESH is INTEGER */
866 /* > The maximum number of residual computations allowed for */
867 /* > refinement. The default is 10. For 'aggressive' set to 100 to */
868 /* > permit convergence using approximate factorizations or */
869 /* > factorizations other than LU. If the factorization uses a */
870 /* > technique other than Gaussian elimination, the guarantees in */
871 /* > ERR_BNDS_NORM and ERR_BNDS_COMP may no longer be trustworthy. */
874 /* > \param[in] RTHRESH */
876 /* > RTHRESH is DOUBLE PRECISION */
877 /* > Determines when to stop refinement if the error estimate stops */
878 /* > decreasing. Refinement will stop when the next solution no longer */
879 /* > satisfies norm(dx_{i+1}) < RTHRESH * norm(dx_i) where norm(Z) is */
880 /* > the infinity norm of Z. RTHRESH satisfies 0 < RTHRESH <= 1. The */
881 /* > default value is 0.5. For 'aggressive' set to 0.9 to permit */
882 /* > convergence on extremely ill-conditioned matrices. See LAWN 165 */
883 /* > for more details. */
886 /* > \param[in] DZ_UB */
888 /* > DZ_UB is DOUBLE PRECISION */
889 /* > Determines when to start considering componentwise convergence. */
890 /* > Componentwise convergence is only considered after each component */
891 /* > of the solution Y is stable, which we definte as the relative */
892 /* > change in each component being less than DZ_UB. The default value */
893 /* > is 0.25, requiring the first bit to be stable. See LAWN 165 for */
894 /* > more details. */
897 /* > \param[in] IGNORE_CWISE */
899 /* > IGNORE_CWISE is LOGICAL */
900 /* > If .TRUE. then ignore componentwise convergence. Default value */
904 /* > \param[out] INFO */
906 /* > INFO is INTEGER */
907 /* > = 0: Successful exit. */
908 /* > < 0: if INFO = -i, the ith argument to ZGBTRS had an illegal */
915 /* > \author Univ. of Tennessee */
916 /* > \author Univ. of California Berkeley */
917 /* > \author Univ. of Colorado Denver */
918 /* > \author NAG Ltd. */
920 /* > \date June 2017 */
922 /* > \ingroup complex16GBcomputational */
924 /* ===================================================================== */
925 /* Subroutine */ int zla_gbrfsx_extended_(integer *prec_type__, integer *
926 trans_type__, integer *n, integer *kl, integer *ku, integer *nrhs,
927 doublecomplex *ab, integer *ldab, doublecomplex *afb, integer *ldafb,
928 integer *ipiv, logical *colequ, doublereal *c__, doublecomplex *b,
929 integer *ldb, doublecomplex *y, integer *ldy, doublereal *berr_out__,
930 integer *n_norms__, doublereal *err_bnds_norm__, doublereal *
931 err_bnds_comp__, doublecomplex *res, doublereal *ayb, doublecomplex *
932 dy, doublecomplex *y_tail__, doublereal *rcond, integer *ithresh,
933 doublereal *rthresh, doublereal *dz_ub__, logical *ignore_cwise__,
936 /* System generated locals */
937 integer ab_dim1, ab_offset, afb_dim1, afb_offset, b_dim1, b_offset,
938 y_dim1, y_offset, err_bnds_norm_dim1, err_bnds_norm_offset,
939 err_bnds_comp_dim1, err_bnds_comp_offset, i__1, i__2, i__3, i__4;
940 doublereal d__1, d__2;
943 /* Local variables */
944 doublereal dx_x__, dz_z__, ymin;
945 extern /* Subroutine */ int zla_lin_berr_(integer *, integer *, integer *
946 , doublecomplex *, doublereal *, doublereal *);
947 doublereal dxratmax, dzratmax;
948 extern /* Subroutine */ int blas_zgbmv_x_(integer *, integer *, integer *
949 , integer *, integer *, doublecomplex *, doublecomplex *, integer
950 *, doublecomplex *, integer *, doublecomplex *, doublecomplex *,
951 integer *, integer *);
952 integer y_prec_state__, i__, j, m;
953 extern /* Subroutine */ int blas_zgbmv2_x_(integer *, integer *, integer
954 *, integer *, integer *, doublecomplex *, doublecomplex *,
955 integer *, doublecomplex *, doublecomplex *, integer *,
956 doublecomplex *, doublecomplex *, integer *, integer *),
957 zla_gbamv_(integer *, integer *, integer *, integer *, integer *,
958 doublereal *, doublecomplex *, integer *, doublecomplex *,
959 integer *, doublereal *, doublereal *, integer *);
963 extern /* Subroutine */ int zgbmv_(char *, integer *, integer *, integer *
964 , integer *, doublecomplex *, doublecomplex *, integer *,
965 doublecomplex *, integer *, doublecomplex *, doublecomplex *,
968 doublereal normx, normy;
969 extern /* Subroutine */ int zcopy_(integer *, doublecomplex *, integer *,
970 doublecomplex *, integer *), zaxpy_(integer *, doublecomplex *,
971 doublecomplex *, integer *, doublecomplex *, integer *);
972 doublereal myhugeval, prev_dz_z__;
973 extern doublereal dlamch_(char *);
974 doublereal yk, final_dx_x__, final_dz_z__, normdx;
975 extern /* Subroutine */ int zgbtrs_(char *, integer *, integer *, integer
976 *, integer *, doublecomplex *, integer *, integer *,
977 doublecomplex *, integer *, integer *), zla_wwaddw_(
978 integer *, doublecomplex *, doublecomplex *, doublecomplex *);
979 extern /* Character */ VOID chla_transtype_(char *, integer *);
980 doublereal prevnormdx;
983 integer x_state__, z_state__;
984 doublereal incr_thresh__;
987 /* -- LAPACK computational routine (version 3.7.1) -- */
988 /* -- LAPACK is a software package provided by Univ. of Tennessee, -- */
989 /* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- */
993 /* ===================================================================== */
996 /* Parameter adjustments */
997 err_bnds_comp_dim1 = *nrhs;
998 err_bnds_comp_offset = 1 + err_bnds_comp_dim1 * 1;
999 err_bnds_comp__ -= err_bnds_comp_offset;
1000 err_bnds_norm_dim1 = *nrhs;
1001 err_bnds_norm_offset = 1 + err_bnds_norm_dim1 * 1;
1002 err_bnds_norm__ -= err_bnds_norm_offset;
1004 ab_offset = 1 + ab_dim1 * 1;
1007 afb_offset = 1 + afb_dim1 * 1;
1012 b_offset = 1 + b_dim1 * 1;
1015 y_offset = 1 + y_dim1 * 1;
1027 chla_transtype_(ch__1, trans_type__);
1028 *(unsigned char *)trans = *(unsigned char *)&ch__1[0];
1029 eps = dlamch_("Epsilon");
1030 myhugeval = dlamch_("Overflow");
1031 /* Force MYHUGEVAL to Inf */
1032 myhugeval *= myhugeval;
1033 /* Using MYHUGEVAL may lead to spurious underflows. */
1034 incr_thresh__ = (doublereal) (*n) * eps;
1037 for (j = 1; j <= i__1; ++j) {
1039 if (y_prec_state__ == 2) {
1041 for (i__ = 1; i__ <= i__2; ++i__) {
1043 y_tail__[i__3].r = 0., y_tail__[i__3].i = 0.;
1050 final_dx_x__ = myhugeval;
1051 final_dz_z__ = myhugeval;
1052 prevnormdx = myhugeval;
1053 prev_dz_z__ = myhugeval;
1058 incr_prec__ = FALSE_;
1060 for (cnt = 1; cnt <= i__2; ++cnt) {
1062 /* Compute residual RES = B_s - op(A_s) * Y, */
1063 /* op(A) = A, A**T, or A**H depending on TRANS (and type). */
1065 zcopy_(n, &b[j * b_dim1 + 1], &c__1, &res[1], &c__1);
1066 if (y_prec_state__ == 0) {
1067 zgbmv_(trans, &m, n, kl, ku, &c_b6, &ab[ab_offset], ldab, &y[
1068 j * y_dim1 + 1], &c__1, &c_b8, &res[1], &c__1);
1069 } else if (y_prec_state__ == 1) {
1070 blas_zgbmv_x__(trans_type__, n, n, kl, ku, &c_b6, &ab[
1071 ab_offset], ldab, &y[j * y_dim1 + 1], &c__1, &c_b8, &
1072 res[1], &c__1, prec_type__);
1074 blas_zgbmv2_x__(trans_type__, n, n, kl, ku, &c_b6, &ab[
1075 ab_offset], ldab, &y[j * y_dim1 + 1], &y_tail__[1], &
1076 c__1, &c_b8, &res[1], &c__1, prec_type__);
1078 /* XXX: RES is no longer needed. */
1079 zcopy_(n, &res[1], &c__1, &dy[1], &c__1);
1080 zgbtrs_(trans, n, kl, ku, &c__1, &afb[afb_offset], ldafb, &ipiv[1]
1083 /* Calculate relative changes DX_X, DZ_Z and ratios DXRAT, DZRAT. */
1091 for (i__ = 1; i__ <= i__3; ++i__) {
1092 i__4 = i__ + j * y_dim1;
1093 yk = (d__1 = y[i__4].r, abs(d__1)) + (d__2 = d_imag(&y[i__ +
1094 j * y_dim1]), abs(d__2));
1096 dyk = (d__1 = dy[i__4].r, abs(d__1)) + (d__2 = d_imag(&dy[i__]
1100 d__1 = dz_z__, d__2 = dyk / yk;
1101 dz_z__ = f2cmax(d__1,d__2);
1102 } else if (dyk != 0.) {
1105 ymin = f2cmin(ymin,yk);
1106 normy = f2cmax(normy,yk);
1109 d__1 = normx, d__2 = yk * c__[i__];
1110 normx = f2cmax(d__1,d__2);
1112 d__1 = normdx, d__2 = dyk * c__[i__];
1113 normdx = f2cmax(d__1,d__2);
1116 normdx = f2cmax(normdx,dyk);
1120 dx_x__ = normdx / normx;
1121 } else if (normdx == 0.) {
1126 dxrat = normdx / prevnormdx;
1127 dzrat = dz_z__ / prev_dz_z__;
1129 /* Check termination criteria. */
1131 if (! (*ignore_cwise__) && ymin * *rcond < incr_thresh__ * normy
1132 && y_prec_state__ < 2) {
1133 incr_prec__ = TRUE_;
1135 if (x_state__ == 3 && dxrat <= *rthresh) {
1138 if (x_state__ == 1) {
1139 if (dx_x__ <= eps) {
1141 } else if (dxrat > *rthresh) {
1142 if (y_prec_state__ != 2) {
1143 incr_prec__ = TRUE_;
1148 if (dxrat > dxratmax) {
1152 if (x_state__ > 1) {
1153 final_dx_x__ = dx_x__;
1156 if (z_state__ == 0 && dz_z__ <= *dz_ub__) {
1159 if (z_state__ == 3 && dzrat <= *rthresh) {
1162 if (z_state__ == 1) {
1163 if (dz_z__ <= eps) {
1165 } else if (dz_z__ > *dz_ub__) {
1168 final_dz_z__ = myhugeval;
1169 } else if (dzrat > *rthresh) {
1170 if (y_prec_state__ != 2) {
1171 incr_prec__ = TRUE_;
1176 if (dzrat > dzratmax) {
1180 if (z_state__ > 1) {
1181 final_dz_z__ = dz_z__;
1185 /* Exit if both normwise and componentwise stopped working, */
1186 /* but if componentwise is unstable, let it go at least two */
1189 if (x_state__ != 1) {
1190 if (*ignore_cwise__) {
1193 if (z_state__ == 3 || z_state__ == 2) {
1196 if (z_state__ == 0 && cnt > 1) {
1201 incr_prec__ = FALSE_;
1204 for (i__ = 1; i__ <= i__3; ++i__) {
1206 y_tail__[i__4].r = 0., y_tail__[i__4].i = 0.;
1209 prevnormdx = normdx;
1210 prev_dz_z__ = dz_z__;
1212 /* Update soluton. */
1214 if (y_prec_state__ < 2) {
1215 zaxpy_(n, &c_b8, &dy[1], &c__1, &y[j * y_dim1 + 1], &c__1);
1217 zla_wwaddw_(n, &y[j * y_dim1 + 1], &y_tail__[1], &dy[1]);
1220 /* Target of "IF (Z_STOP .AND. X_STOP)". Sun's f77 won't CALL MYEXIT. */
1223 /* Set final_* when cnt hits ithresh. */
1225 if (x_state__ == 1) {
1226 final_dx_x__ = dx_x__;
1228 if (z_state__ == 1) {
1229 final_dz_z__ = dz_z__;
1232 /* Compute error bounds. */
1234 if (*n_norms__ >= 1) {
1235 err_bnds_norm__[j + (err_bnds_norm_dim1 << 1)] = final_dx_x__ / (
1238 if (*n_norms__ >= 2) {
1239 err_bnds_comp__[j + (err_bnds_comp_dim1 << 1)] = final_dz_z__ / (
1243 /* Compute componentwise relative backward error from formula */
1244 /* f2cmax(i) ( abs(R(i)) / ( abs(op(A_s))*abs(Y) + abs(B_s) )(i) ) */
1245 /* where abs(Z) is the componentwise absolute value of the matrix */
1248 /* Compute residual RES = B_s - op(A_s) * Y, */
1249 /* op(A) = A, A**T, or A**H depending on TRANS (and type). */
1251 zcopy_(n, &b[j * b_dim1 + 1], &c__1, &res[1], &c__1);
1252 zgbmv_(trans, n, n, kl, ku, &c_b6, &ab[ab_offset], ldab, &y[j *
1253 y_dim1 + 1], &c__1, &c_b8, &res[1], &c__1);
1255 for (i__ = 1; i__ <= i__2; ++i__) {
1256 i__3 = i__ + j * b_dim1;
1257 ayb[i__] = (d__1 = b[i__3].r, abs(d__1)) + (d__2 = d_imag(&b[i__
1258 + j * b_dim1]), abs(d__2));
1261 /* Compute abs(op(A_s))*abs(Y) + abs(B_s). */
1263 zla_gbamv_(trans_type__, n, n, kl, ku, &c_b31, &ab[ab_offset], ldab,
1264 &y[j * y_dim1 + 1], &c__1, &c_b31, &ayb[1], &c__1);
1265 zla_lin_berr_(n, n, &c__1, &res[1], &ayb[1], &berr_out__[j]);
1267 /* End of loop for each RHS. */
1272 } /* zla_gbrfsx_extended__ */