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#include "rb_lapack.h"
extern VOID slaein_(logical* rightv, logical* noinit, integer* n, real* h, integer* ldh, real* wr, real* wi, real* vr, real* vi, real* b, integer* ldb, real* work, real* eps3, real* smlnum, real* bignum, integer* info);
static VALUE
rblapack_slaein(int argc, VALUE *argv, VALUE self){
VALUE rblapack_rightv;
logical rightv;
VALUE rblapack_noinit;
logical noinit;
VALUE rblapack_h;
real *h;
VALUE rblapack_wr;
real wr;
VALUE rblapack_wi;
real wi;
VALUE rblapack_vr;
real *vr;
VALUE rblapack_vi;
real *vi;
VALUE rblapack_eps3;
real eps3;
VALUE rblapack_smlnum;
real smlnum;
VALUE rblapack_bignum;
real bignum;
VALUE rblapack_info;
integer info;
VALUE rblapack_vr_out__;
real *vr_out__;
VALUE rblapack_vi_out__;
real *vi_out__;
real *b;
real *work;
integer ldh;
integer n;
integer ldb;
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, vr, vi = NumRu::Lapack.slaein( rightv, noinit, h, wr, wi, vr, vi, eps3, smlnum, bignum, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE SLAEIN( RIGHTV, NOINIT, N, H, LDH, WR, WI, VR, VI, B, LDB, WORK, EPS3, SMLNUM, BIGNUM, INFO )\n\n* Purpose\n* =======\n*\n* SLAEIN uses inverse iteration to find a right or left eigenvector\n* corresponding to the eigenvalue (WR,WI) of a real upper Hessenberg\n* matrix H.\n*\n\n* Arguments\n* =========\n*\n* RIGHTV (input) LOGICAL\n* = .TRUE. : compute right eigenvector;\n* = .FALSE.: compute left eigenvector.\n*\n* NOINIT (input) LOGICAL\n* = .TRUE. : no initial vector supplied in (VR,VI).\n* = .FALSE.: initial vector supplied in (VR,VI).\n*\n* N (input) INTEGER\n* The order of the matrix H. N >= 0.\n*\n* H (input) REAL array, dimension (LDH,N)\n* The upper Hessenberg matrix H.\n*\n* LDH (input) INTEGER\n* The leading dimension of the array H. LDH >= max(1,N).\n*\n* WR (input) REAL\n* WI (input) REAL\n* The real and imaginary parts of the eigenvalue of H whose\n* corresponding right or left eigenvector is to be computed.\n*\n* VR (input/output) REAL array, dimension (N)\n* VI (input/output) REAL array, dimension (N)\n* On entry, if NOINIT = .FALSE. and WI = 0.0, VR must contain\n* a real starting vector for inverse iteration using the real\n* eigenvalue WR; if NOINIT = .FALSE. and WI.ne.0.0, VR and VI\n* must contain the real and imaginary parts of a complex\n* starting vector for inverse iteration using the complex\n* eigenvalue (WR,WI); otherwise VR and VI need not be set.\n* On exit, if WI = 0.0 (real eigenvalue), VR contains the\n* computed real eigenvector; if WI.ne.0.0 (complex eigenvalue),\n* VR and VI contain the real and imaginary parts of the\n* computed complex eigenvector. The eigenvector is normalized\n* so that the component of largest magnitude has magnitude 1;\n* here the magnitude of a complex number (x,y) is taken to be\n* |x| + |y|.\n* VI is not referenced if WI = 0.0.\n*\n* B (workspace) REAL array, dimension (LDB,N)\n*\n* LDB (input) INTEGER\n* The leading dimension of the array B. LDB >= N+1.\n*\n* WORK (workspace) REAL array, dimension (N)\n*\n* EPS3 (input) REAL\n* A small machine-dependent value which is used to perturb\n* close eigenvalues, and to replace zero pivots.\n*\n* SMLNUM (input) REAL\n* A machine-dependent value close to the underflow threshold.\n*\n* BIGNUM (input) REAL\n* A machine-dependent value close to the overflow threshold.\n*\n* INFO (output) INTEGER\n* = 0: successful exit\n* = 1: inverse iteration did not converge; VR is set to the\n* last iterate, and so is VI if WI.ne.0.0.\n*\n\n* =====================================================================\n*\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n info, vr, vi = NumRu::Lapack.slaein( rightv, noinit, h, wr, wi, vr, vi, eps3, smlnum, bignum, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 10 && argc != 10)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 10)", argc);
rblapack_rightv = argv[0];
rblapack_noinit = argv[1];
rblapack_h = argv[2];
rblapack_wr = argv[3];
rblapack_wi = argv[4];
rblapack_vr = argv[5];
rblapack_vi = argv[6];
rblapack_eps3 = argv[7];
rblapack_smlnum = argv[8];
rblapack_bignum = argv[9];
if (argc == 10) {
} else if (rblapack_options != Qnil) {
} else {
}
rightv = (rblapack_rightv == Qtrue);
if (!NA_IsNArray(rblapack_h))
rb_raise(rb_eArgError, "h (3th argument) must be NArray");
if (NA_RANK(rblapack_h) != 2)
rb_raise(rb_eArgError, "rank of h (3th argument) must be %d", 2);
ldh = NA_SHAPE0(rblapack_h);
n = NA_SHAPE1(rblapack_h);
if (NA_TYPE(rblapack_h) != NA_SFLOAT)
rblapack_h = na_change_type(rblapack_h, NA_SFLOAT);
h = NA_PTR_TYPE(rblapack_h, real*);
wi = (real)NUM2DBL(rblapack_wi);
if (!NA_IsNArray(rblapack_vi))
rb_raise(rb_eArgError, "vi (7th argument) must be NArray");
if (NA_RANK(rblapack_vi) != 1)
rb_raise(rb_eArgError, "rank of vi (7th argument) must be %d", 1);
if (NA_SHAPE0(rblapack_vi) != n)
rb_raise(rb_eRuntimeError, "shape 0 of vi must be the same as shape 1 of h");
if (NA_TYPE(rblapack_vi) != NA_SFLOAT)
rblapack_vi = na_change_type(rblapack_vi, NA_SFLOAT);
vi = NA_PTR_TYPE(rblapack_vi, real*);
smlnum = (real)NUM2DBL(rblapack_smlnum);
noinit = (rblapack_noinit == Qtrue);
if (!NA_IsNArray(rblapack_vr))
rb_raise(rb_eArgError, "vr (6th argument) must be NArray");
if (NA_RANK(rblapack_vr) != 1)
rb_raise(rb_eArgError, "rank of vr (6th argument) must be %d", 1);
if (NA_SHAPE0(rblapack_vr) != n)
rb_raise(rb_eRuntimeError, "shape 0 of vr must be the same as shape 1 of h");
if (NA_TYPE(rblapack_vr) != NA_SFLOAT)
rblapack_vr = na_change_type(rblapack_vr, NA_SFLOAT);
vr = NA_PTR_TYPE(rblapack_vr, real*);
bignum = (real)NUM2DBL(rblapack_bignum);
wr = (real)NUM2DBL(rblapack_wr);
ldb = n+1;
eps3 = (real)NUM2DBL(rblapack_eps3);
{
na_shape_t shape[1];
shape[0] = n;
rblapack_vr_out__ = na_make_object(NA_SFLOAT, 1, shape, cNArray);
}
vr_out__ = NA_PTR_TYPE(rblapack_vr_out__, real*);
MEMCPY(vr_out__, vr, real, NA_TOTAL(rblapack_vr));
rblapack_vr = rblapack_vr_out__;
vr = vr_out__;
{
na_shape_t shape[1];
shape[0] = n;
rblapack_vi_out__ = na_make_object(NA_SFLOAT, 1, shape, cNArray);
}
vi_out__ = NA_PTR_TYPE(rblapack_vi_out__, real*);
MEMCPY(vi_out__, vi, real, NA_TOTAL(rblapack_vi));
rblapack_vi = rblapack_vi_out__;
vi = vi_out__;
b = ALLOC_N(real, (ldb)*(n));
work = ALLOC_N(real, (n));
slaein_(&rightv, &noinit, &n, h, &ldh, &wr, &wi, vr, vi, b, &ldb, work, &eps3, &smlnum, &bignum, &info);
free(b);
free(work);
rblapack_info = INT2NUM(info);
return rb_ary_new3(3, rblapack_info, rblapack_vr, rblapack_vi);
}
void
init_lapack_slaein(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "slaein", rblapack_slaein, -1);
}
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