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#include "rb_lapack.h"
extern VOID cungbr_(char* vect, integer* m, integer* n, integer* k, complex* a, integer* lda, complex* tau, complex* work, integer* lwork, integer* info);
static VALUE
rblapack_cungbr(int argc, VALUE *argv, VALUE self){
VALUE rblapack_vect;
char vect;
VALUE rblapack_m;
integer m;
VALUE rblapack_k;
integer k;
VALUE rblapack_a;
complex *a;
VALUE rblapack_tau;
complex *tau;
VALUE rblapack_lwork;
integer lwork;
VALUE rblapack_work;
complex *work;
VALUE rblapack_info;
integer info;
VALUE rblapack_a_out__;
complex *a_out__;
integer lda;
integer n;
VALUE rblapack_options;
if (argc > 0 && TYPE(argv[argc-1]) == T_HASH) {
argc--;
rblapack_options = argv[argc];
if (rb_hash_aref(rblapack_options, sHelp) == Qtrue) {
printf("%s\n", "USAGE:\n work, info, a = NumRu::Lapack.cungbr( vect, m, k, a, tau, [:lwork => lwork, :usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE CUNGBR( VECT, M, N, K, A, LDA, TAU, WORK, LWORK, INFO )\n\n* Purpose\n* =======\n*\n* CUNGBR generates one of the complex unitary matrices Q or P**H\n* determined by CGEBRD when reducing a complex matrix A to bidiagonal\n* form: A = Q * B * P**H. Q and P**H are defined as products of\n* elementary reflectors H(i) or G(i) respectively.\n*\n* If VECT = 'Q', A is assumed to have been an M-by-K matrix, and Q\n* is of order M:\n* if m >= k, Q = H(1) H(2) . . . H(k) and CUNGBR returns the first n\n* columns of Q, where m >= n >= k;\n* if m < k, Q = H(1) H(2) . . . H(m-1) and CUNGBR returns Q as an\n* M-by-M matrix.\n*\n* If VECT = 'P', A is assumed to have been a K-by-N matrix, and P**H\n* is of order N:\n* if k < n, P**H = G(k) . . . G(2) G(1) and CUNGBR returns the first m\n* rows of P**H, where n >= m >= k;\n* if k >= n, P**H = G(n-1) . . . G(2) G(1) and CUNGBR returns P**H as\n* an N-by-N matrix.\n*\n\n* Arguments\n* =========\n*\n* VECT (input) CHARACTER*1\n* Specifies whether the matrix Q or the matrix P**H is\n* required, as defined in the transformation applied by CGEBRD:\n* = 'Q': generate Q;\n* = 'P': generate P**H.\n*\n* M (input) INTEGER\n* The number of rows of the matrix Q or P**H to be returned.\n* M >= 0.\n*\n* N (input) INTEGER\n* The number of columns of the matrix Q or P**H to be returned.\n* N >= 0.\n* If VECT = 'Q', M >= N >= min(M,K);\n* if VECT = 'P', N >= M >= min(N,K).\n*\n* K (input) INTEGER\n* If VECT = 'Q', the number of columns in the original M-by-K\n* matrix reduced by CGEBRD.\n* If VECT = 'P', the number of rows in the original K-by-N\n* matrix reduced by CGEBRD.\n* K >= 0.\n*\n* A (input/output) COMPLEX array, dimension (LDA,N)\n* On entry, the vectors which define the elementary reflectors,\n* as returned by CGEBRD.\n* On exit, the M-by-N matrix Q or P**H.\n*\n* LDA (input) INTEGER\n* The leading dimension of the array A. LDA >= M.\n*\n* TAU (input) COMPLEX array, dimension\n* (min(M,K)) if VECT = 'Q'\n* (min(N,K)) if VECT = 'P'\n* TAU(i) must contain the scalar factor of the elementary\n* reflector H(i) or G(i), which determines Q or P**H, as\n* returned by CGEBRD in its array argument TAUQ or TAUP.\n*\n* WORK (workspace/output) COMPLEX array, dimension (MAX(1,LWORK))\n* On exit, if INFO = 0, WORK(1) returns the optimal LWORK.\n*\n* LWORK (input) INTEGER\n* The dimension of the array WORK. LWORK >= max(1,min(M,N)).\n* For optimum performance LWORK >= min(M,N)*NB, where NB\n* is the optimal blocksize.\n*\n* If LWORK = -1, then a workspace query is assumed; the routine\n* only calculates the optimal size of the WORK array, returns\n* this value as the first entry of the WORK array, and no error\n* message related to LWORK is issued by XERBLA.\n*\n* INFO (output) INTEGER\n* = 0: successful exit\n* < 0: if INFO = -i, the i-th argument had an illegal value\n*\n\n* =====================================================================\n*\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n work, info, a = NumRu::Lapack.cungbr( vect, m, k, a, tau, [:lwork => lwork, :usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 5 && argc != 6)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 5)", argc);
rblapack_vect = argv[0];
rblapack_m = argv[1];
rblapack_k = argv[2];
rblapack_a = argv[3];
rblapack_tau = argv[4];
if (argc == 6) {
rblapack_lwork = argv[5];
} else if (rblapack_options != Qnil) {
rblapack_lwork = rb_hash_aref(rblapack_options, ID2SYM(rb_intern("lwork")));
} else {
rblapack_lwork = Qnil;
}
vect = StringValueCStr(rblapack_vect)[0];
k = NUM2INT(rblapack_k);
m = NUM2INT(rblapack_m);
if (!NA_IsNArray(rblapack_tau))
rb_raise(rb_eArgError, "tau (5th argument) must be NArray");
if (NA_RANK(rblapack_tau) != 1)
rb_raise(rb_eArgError, "rank of tau (5th argument) must be %d", 1);
if (NA_SHAPE0(rblapack_tau) != (MIN(m,k)))
rb_raise(rb_eRuntimeError, "shape 0 of tau must be %d", MIN(m,k));
if (NA_TYPE(rblapack_tau) != NA_SCOMPLEX)
rblapack_tau = na_change_type(rblapack_tau, NA_SCOMPLEX);
tau = NA_PTR_TYPE(rblapack_tau, complex*);
if (!NA_IsNArray(rblapack_a))
rb_raise(rb_eArgError, "a (4th argument) must be NArray");
if (NA_RANK(rblapack_a) != 2)
rb_raise(rb_eArgError, "rank of a (4th argument) must be %d", 2);
lda = NA_SHAPE0(rblapack_a);
n = NA_SHAPE1(rblapack_a);
if (NA_TYPE(rblapack_a) != NA_SCOMPLEX)
rblapack_a = na_change_type(rblapack_a, NA_SCOMPLEX);
a = NA_PTR_TYPE(rblapack_a, complex*);
if (rblapack_lwork == Qnil)
lwork = MIN(m,n);
else {
lwork = NUM2INT(rblapack_lwork);
}
{
na_shape_t shape[1];
shape[0] = MAX(1,lwork);
rblapack_work = na_make_object(NA_SCOMPLEX, 1, shape, cNArray);
}
work = NA_PTR_TYPE(rblapack_work, complex*);
{
na_shape_t shape[2];
shape[0] = lda;
shape[1] = n;
rblapack_a_out__ = na_make_object(NA_SCOMPLEX, 2, shape, cNArray);
}
a_out__ = NA_PTR_TYPE(rblapack_a_out__, complex*);
MEMCPY(a_out__, a, complex, NA_TOTAL(rblapack_a));
rblapack_a = rblapack_a_out__;
a = a_out__;
cungbr_(&vect, &m, &n, &k, a, &lda, tau, work, &lwork, &info);
rblapack_info = INT2NUM(info);
return rb_ary_new3(3, rblapack_work, rblapack_info, rblapack_a);
}
void
init_lapack_cungbr(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "cungbr", rblapack_cungbr, -1);
}
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