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#include "rb_lapack.h"
extern VOID sopgtr_(char* uplo, integer* n, real* ap, real* tau, real* q, integer* ldq, real* work, integer* info);
static VALUE
rblapack_sopgtr(int argc, VALUE *argv, VALUE self){
VALUE rblapack_uplo;
char uplo;
VALUE rblapack_ap;
real *ap;
VALUE rblapack_tau;
real *tau;
VALUE rblapack_q;
real *q;
VALUE rblapack_info;
integer info;
real *work;
integer ldap;
integer ldtau;
integer ldq;
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 q, info = NumRu::Lapack.sopgtr( uplo, ap, tau, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE SOPGTR( UPLO, N, AP, TAU, Q, LDQ, WORK, INFO )\n\n* Purpose\n* =======\n*\n* SOPGTR generates a real orthogonal matrix Q which is defined as the\n* product of n-1 elementary reflectors H(i) of order n, as returned by\n* SSPTRD using packed storage:\n*\n* if UPLO = 'U', Q = H(n-1) . . . H(2) H(1),\n*\n* if UPLO = 'L', Q = H(1) H(2) . . . H(n-1).\n*\n\n* Arguments\n* =========\n*\n* UPLO (input) CHARACTER*1\n* = 'U': Upper triangular packed storage used in previous\n* call to SSPTRD;\n* = 'L': Lower triangular packed storage used in previous\n* call to SSPTRD.\n*\n* N (input) INTEGER\n* The order of the matrix Q. N >= 0.\n*\n* AP (input) REAL array, dimension (N*(N+1)/2)\n* The vectors which define the elementary reflectors, as\n* returned by SSPTRD.\n*\n* TAU (input) REAL array, dimension (N-1)\n* TAU(i) must contain the scalar factor of the elementary\n* reflector H(i), as returned by SSPTRD.\n*\n* Q (output) REAL array, dimension (LDQ,N)\n* The N-by-N orthogonal matrix Q.\n*\n* LDQ (input) INTEGER\n* The leading dimension of the array Q. LDQ >= max(1,N).\n*\n* WORK (workspace) REAL array, dimension (N-1)\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 q, info = NumRu::Lapack.sopgtr( uplo, ap, tau, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 3 && argc != 3)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 3)", argc);
rblapack_uplo = argv[0];
rblapack_ap = argv[1];
rblapack_tau = argv[2];
if (argc == 3) {
} else if (rblapack_options != Qnil) {
} else {
}
uplo = StringValueCStr(rblapack_uplo)[0];
if (!NA_IsNArray(rblapack_tau))
rb_raise(rb_eArgError, "tau (3th argument) must be NArray");
if (NA_RANK(rblapack_tau) != 1)
rb_raise(rb_eArgError, "rank of tau (3th argument) must be %d", 1);
ldtau = NA_SHAPE0(rblapack_tau);
if (NA_TYPE(rblapack_tau) != NA_SFLOAT)
rblapack_tau = na_change_type(rblapack_tau, NA_SFLOAT);
tau = NA_PTR_TYPE(rblapack_tau, real*);
n = ldtau+1;
if (!NA_IsNArray(rblapack_ap))
rb_raise(rb_eArgError, "ap (2th argument) must be NArray");
if (NA_RANK(rblapack_ap) != 1)
rb_raise(rb_eArgError, "rank of ap (2th argument) must be %d", 1);
ldap = NA_SHAPE0(rblapack_ap);
if (NA_TYPE(rblapack_ap) != NA_SFLOAT)
rblapack_ap = na_change_type(rblapack_ap, NA_SFLOAT);
ap = NA_PTR_TYPE(rblapack_ap, real*);
ldq = MAX(1,n);
{
na_shape_t shape[2];
shape[0] = ldq;
shape[1] = n;
rblapack_q = na_make_object(NA_SFLOAT, 2, shape, cNArray);
}
q = NA_PTR_TYPE(rblapack_q, real*);
work = ALLOC_N(real, (n-1));
sopgtr_(&uplo, &n, ap, tau, q, &ldq, work, &info);
free(work);
rblapack_info = INT2NUM(info);
return rb_ary_new3(2, rblapack_q, rblapack_info);
}
void
init_lapack_sopgtr(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "sopgtr", rblapack_sopgtr, -1);
}
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