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#include "rb_lapack.h"
extern VOID cungr2_(integer* m, integer* n, integer* k, complex* a, integer* lda, complex* tau, complex* work, integer* info);
static VALUE
rblapack_cungr2(int argc, VALUE *argv, VALUE self){
VALUE rblapack_a;
complex *a;
VALUE rblapack_tau;
complex *tau;
VALUE rblapack_info;
integer info;
VALUE rblapack_a_out__;
complex *a_out__;
complex *work;
integer lda;
integer n;
integer k;
integer m;
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 info, a = NumRu::Lapack.cungr2( a, tau, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE CUNGR2( M, N, K, A, LDA, TAU, WORK, INFO )\n\n* Purpose\n* =======\n*\n* CUNGR2 generates an m by n complex matrix Q with orthonormal rows,\n* which is defined as the last m rows of a product of k elementary\n* reflectors of order n\n*\n* Q = H(1)' H(2)' . . . H(k)'\n*\n* as returned by CGERQF.\n*\n\n* Arguments\n* =========\n*\n* M (input) INTEGER\n* The number of rows of the matrix Q. M >= 0.\n*\n* N (input) INTEGER\n* The number of columns of the matrix Q. N >= M.\n*\n* K (input) INTEGER\n* The number of elementary reflectors whose product defines the\n* matrix Q. M >= K >= 0.\n*\n* A (input/output) COMPLEX array, dimension (LDA,N)\n* On entry, the (m-k+i)-th row must contain the vector which\n* defines the elementary reflector H(i), for i = 1,2,...,k, as\n* returned by CGERQF in the last k rows of its array argument\n* A.\n* On exit, the m-by-n matrix Q.\n*\n* LDA (input) INTEGER\n* The first dimension of the array A. LDA >= max(1,M).\n*\n* TAU (input) COMPLEX array, dimension (K)\n* TAU(i) must contain the scalar factor of the elementary\n* reflector H(i), as returned by CGERQF.\n*\n* WORK (workspace) COMPLEX array, dimension (M)\n*\n* INFO (output) INTEGER\n* = 0: successful exit\n* < 0: if INFO = -i, the i-th argument has an illegal value\n*\n\n* =====================================================================\n*\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n info, a = NumRu::Lapack.cungr2( a, tau, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 2 && argc != 2)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 2)", argc);
rblapack_a = argv[0];
rblapack_tau = argv[1];
if (argc == 2) {
} else if (rblapack_options != Qnil) {
} else {
}
if (!NA_IsNArray(rblapack_a))
rb_raise(rb_eArgError, "a (1th argument) must be NArray");
if (NA_RANK(rblapack_a) != 2)
rb_raise(rb_eArgError, "rank of a (1th 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*);
m = lda;
if (!NA_IsNArray(rblapack_tau))
rb_raise(rb_eArgError, "tau (2th argument) must be NArray");
if (NA_RANK(rblapack_tau) != 1)
rb_raise(rb_eArgError, "rank of tau (2th argument) must be %d", 1);
k = NA_SHAPE0(rblapack_tau);
if (NA_TYPE(rblapack_tau) != NA_SCOMPLEX)
rblapack_tau = na_change_type(rblapack_tau, NA_SCOMPLEX);
tau = NA_PTR_TYPE(rblapack_tau, 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__;
work = ALLOC_N(complex, (m));
cungr2_(&m, &n, &k, a, &lda, tau, work, &info);
free(work);
rblapack_info = INT2NUM(info);
return rb_ary_new3(2, rblapack_info, rblapack_a);
}
void
init_lapack_cungr2(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "cungr2", rblapack_cungr2, -1);
}
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