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#include "rb_lapack.h"
extern VOID dsterf_(integer* n, doublereal* d, doublereal* e, integer* info);
static VALUE
rblapack_dsterf(int argc, VALUE *argv, VALUE self){
VALUE rblapack_d;
doublereal *d;
VALUE rblapack_e;
doublereal *e;
VALUE rblapack_info;
integer info;
VALUE rblapack_d_out__;
doublereal *d_out__;
VALUE rblapack_e_out__;
doublereal *e_out__;
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 info, d, e = NumRu::Lapack.dsterf( d, e, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE DSTERF( N, D, E, INFO )\n\n* Purpose\n* =======\n*\n* DSTERF computes all eigenvalues of a symmetric tridiagonal matrix\n* using the Pal-Walker-Kahan variant of the QL or QR algorithm.\n*\n\n* Arguments\n* =========\n*\n* N (input) INTEGER\n* The order of the matrix. N >= 0.\n*\n* D (input/output) DOUBLE PRECISION array, dimension (N)\n* On entry, the n diagonal elements of the tridiagonal matrix.\n* On exit, if INFO = 0, the eigenvalues in ascending order.\n*\n* E (input/output) DOUBLE PRECISION array, dimension (N-1)\n* On entry, the (n-1) subdiagonal elements of the tridiagonal\n* matrix.\n* On exit, E has been destroyed.\n*\n* INFO (output) INTEGER\n* = 0: successful exit\n* < 0: if INFO = -i, the i-th argument had an illegal value\n* > 0: the algorithm failed to find all of the eigenvalues in\n* a total of 30*N iterations; if INFO = i, then i\n* elements of E have not converged to zero.\n*\n\n* =====================================================================\n*\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n info, d, e = NumRu::Lapack.dsterf( d, e, [: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_d = argv[0];
rblapack_e = argv[1];
if (argc == 2) {
} else if (rblapack_options != Qnil) {
} else {
}
if (!NA_IsNArray(rblapack_d))
rb_raise(rb_eArgError, "d (1th argument) must be NArray");
if (NA_RANK(rblapack_d) != 1)
rb_raise(rb_eArgError, "rank of d (1th argument) must be %d", 1);
n = NA_SHAPE0(rblapack_d);
if (NA_TYPE(rblapack_d) != NA_DFLOAT)
rblapack_d = na_change_type(rblapack_d, NA_DFLOAT);
d = NA_PTR_TYPE(rblapack_d, doublereal*);
if (!NA_IsNArray(rblapack_e))
rb_raise(rb_eArgError, "e (2th argument) must be NArray");
if (NA_RANK(rblapack_e) != 1)
rb_raise(rb_eArgError, "rank of e (2th argument) must be %d", 1);
if (NA_SHAPE0(rblapack_e) != (n-1))
rb_raise(rb_eRuntimeError, "shape 0 of e must be %d", n-1);
if (NA_TYPE(rblapack_e) != NA_DFLOAT)
rblapack_e = na_change_type(rblapack_e, NA_DFLOAT);
e = NA_PTR_TYPE(rblapack_e, doublereal*);
{
na_shape_t shape[1];
shape[0] = n;
rblapack_d_out__ = na_make_object(NA_DFLOAT, 1, shape, cNArray);
}
d_out__ = NA_PTR_TYPE(rblapack_d_out__, doublereal*);
MEMCPY(d_out__, d, doublereal, NA_TOTAL(rblapack_d));
rblapack_d = rblapack_d_out__;
d = d_out__;
{
na_shape_t shape[1];
shape[0] = n-1;
rblapack_e_out__ = na_make_object(NA_DFLOAT, 1, shape, cNArray);
}
e_out__ = NA_PTR_TYPE(rblapack_e_out__, doublereal*);
MEMCPY(e_out__, e, doublereal, NA_TOTAL(rblapack_e));
rblapack_e = rblapack_e_out__;
e = e_out__;
dsterf_(&n, d, e, &info);
rblapack_info = INT2NUM(info);
return rb_ary_new3(3, rblapack_info, rblapack_d, rblapack_e);
}
void
init_lapack_dsterf(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "dsterf", rblapack_dsterf, -1);
}
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