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#include "rb_lapack.h"
extern VOID dlasq6_(integer* i0, integer* n0, doublereal* z, integer* pp, doublereal* dmin, doublereal* dmin1, doublereal* dmin2, doublereal* dn, doublereal* dnm1, doublereal* dnm2);
static VALUE
rblapack_dlasq6(int argc, VALUE *argv, VALUE self){
VALUE rblapack_i0;
integer i0;
VALUE rblapack_n0;
integer n0;
VALUE rblapack_z;
doublereal *z;
VALUE rblapack_pp;
integer pp;
VALUE rblapack_dmin;
doublereal dmin;
VALUE rblapack_dmin1;
doublereal dmin1;
VALUE rblapack_dmin2;
doublereal dmin2;
VALUE rblapack_dn;
doublereal dn;
VALUE rblapack_dnm1;
doublereal dnm1;
VALUE rblapack_dnm2;
doublereal dnm2;
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 dmin, dmin1, dmin2, dn, dnm1, dnm2 = NumRu::Lapack.dlasq6( i0, n0, z, pp, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE DLASQ6( I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2 )\n\n* Purpose\n* =======\n*\n* DLASQ6 computes one dqd (shift equal to zero) transform in\n* ping-pong form, with protection against underflow and overflow.\n*\n\n* Arguments\n* =========\n*\n* I0 (input) INTEGER\n* First index.\n*\n* N0 (input) INTEGER\n* Last index.\n*\n* Z (input) DOUBLE PRECISION array, dimension ( 4*N )\n* Z holds the qd array. EMIN is stored in Z(4*N0) to avoid\n* an extra argument.\n*\n* PP (input) INTEGER\n* PP=0 for ping, PP=1 for pong.\n*\n* DMIN (output) DOUBLE PRECISION\n* Minimum value of d.\n*\n* DMIN1 (output) DOUBLE PRECISION\n* Minimum value of d, excluding D( N0 ).\n*\n* DMIN2 (output) DOUBLE PRECISION\n* Minimum value of d, excluding D( N0 ) and D( N0-1 ).\n*\n* DN (output) DOUBLE PRECISION\n* d(N0), the last value of d.\n*\n* DNM1 (output) DOUBLE PRECISION\n* d(N0-1).\n*\n* DNM2 (output) DOUBLE PRECISION\n* d(N0-2).\n*\n\n* =====================================================================\n*\n* .. Parameter ..\n DOUBLE PRECISION ZERO\n PARAMETER ( ZERO = 0.0D0 )\n* ..\n* .. Local Scalars ..\n INTEGER J4, J4P2\n DOUBLE PRECISION D, EMIN, SAFMIN, TEMP\n* ..\n* .. External Function ..\n DOUBLE PRECISION DLAMCH\n EXTERNAL DLAMCH\n* ..\n* .. Intrinsic Functions ..\n INTRINSIC MIN\n* ..\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n dmin, dmin1, dmin2, dn, dnm1, dnm2 = NumRu::Lapack.dlasq6( i0, n0, z, pp, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 4 && argc != 4)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 4)", argc);
rblapack_i0 = argv[0];
rblapack_n0 = argv[1];
rblapack_z = argv[2];
rblapack_pp = argv[3];
if (argc == 4) {
} else if (rblapack_options != Qnil) {
} else {
}
i0 = NUM2INT(rblapack_i0);
pp = NUM2INT(rblapack_pp);
n0 = NUM2INT(rblapack_n0);
if (!NA_IsNArray(rblapack_z))
rb_raise(rb_eArgError, "z (3th argument) must be NArray");
if (NA_RANK(rblapack_z) != 1)
rb_raise(rb_eArgError, "rank of z (3th argument) must be %d", 1);
if (NA_SHAPE0(rblapack_z) != (4*n0))
rb_raise(rb_eRuntimeError, "shape 0 of z must be %d", 4*n0);
if (NA_TYPE(rblapack_z) != NA_DFLOAT)
rblapack_z = na_change_type(rblapack_z, NA_DFLOAT);
z = NA_PTR_TYPE(rblapack_z, doublereal*);
dlasq6_(&i0, &n0, z, &pp, &dmin, &dmin1, &dmin2, &dn, &dnm1, &dnm2);
rblapack_dmin = rb_float_new((double)dmin);
rblapack_dmin1 = rb_float_new((double)dmin1);
rblapack_dmin2 = rb_float_new((double)dmin2);
rblapack_dn = rb_float_new((double)dn);
rblapack_dnm1 = rb_float_new((double)dnm1);
rblapack_dnm2 = rb_float_new((double)dnm2);
return rb_ary_new3(6, rblapack_dmin, rblapack_dmin1, rblapack_dmin2, rblapack_dn, rblapack_dnm1, rblapack_dnm2);
}
void
init_lapack_dlasq6(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "dlasq6", rblapack_dlasq6, -1);
}
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