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#include "rb_lapack.h"
extern real sla_gbrpvgrw_(integer* n, integer* kl, integer* ku, integer* ncols, real* ab, integer* ldab, real* afb, integer* ldafb);
static VALUE
rblapack_sla_gbrpvgrw(int argc, VALUE *argv, VALUE self){
#ifdef USEXBLAS
VALUE rblapack_kl;
integer kl;
VALUE rblapack_ku;
integer ku;
VALUE rblapack_ncols;
integer ncols;
VALUE rblapack_ab;
real *ab;
VALUE rblapack_afb;
real *afb;
VALUE rblapack___out__;
real __out__;
integer ldab;
integer n;
integer ldafb;
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 __out__ = NumRu::Lapack.sla_gbrpvgrw( kl, ku, ncols, ab, afb, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n REAL FUNCTION SLA_GBRPVGRW( N, KL, KU, NCOLS, AB, LDAB, AFB, LDAFB )\n\n* Purpose\n* =======\n*\n* SLA_GBRPVGRW computes the reciprocal pivot growth factor\n* norm(A)/norm(U). The \"max absolute element\" norm is used. If this is\n* much less than 1, the stability of the LU factorization of the\n* (equilibrated) matrix A could be poor. This also means that the\n* solution X, estimated condition numbers, and error bounds could be\n* unreliable.\n*\n\n* Arguments\n* =========\n*\n* N (input) INTEGER\n* The number of linear equations, i.e., the order of the\n* matrix A. N >= 0.\n*\n* KL (input) INTEGER\n* The number of subdiagonals within the band of A. KL >= 0.\n*\n* KU (input) INTEGER\n* The number of superdiagonals within the band of A. KU >= 0.\n*\n* NCOLS (input) INTEGER\n* The number of columns of the matrix A. NCOLS >= 0.\n*\n* AB (input) REAL array, dimension (LDAB,N)\n* On entry, the matrix A in band storage, in rows 1 to KL+KU+1.\n* The j-th column of A is stored in the j-th column of the\n* array AB as follows:\n* AB(KU+1+i-j,j) = A(i,j) for max(1,j-KU)<=i<=min(N,j+kl)\n*\n* LDAB (input) INTEGER\n* The leading dimension of the array AB. LDAB >= KL+KU+1.\n*\n* AFB (input) REAL array, dimension (LDAFB,N)\n* Details of the LU factorization of the band matrix A, as\n* computed by SGBTRF. U is stored as an upper triangular\n* band matrix with KL+KU superdiagonals in rows 1 to KL+KU+1,\n* and the multipliers used during the factorization are stored\n* in rows KL+KU+2 to 2*KL+KU+1.\n*\n* LDAFB (input) INTEGER\n* The leading dimension of the array AFB. LDAFB >= 2*KL+KU+1.\n*\n\n* =====================================================================\n*\n* .. Local Scalars ..\n INTEGER I, J, KD\n REAL AMAX, UMAX, RPVGRW\n* ..\n* .. Intrinsic Functions ..\n INTRINSIC ABS, MAX, MIN\n* ..\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n __out__ = NumRu::Lapack.sla_gbrpvgrw( kl, ku, ncols, ab, afb, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 5 && argc != 5)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 5)", argc);
rblapack_kl = argv[0];
rblapack_ku = argv[1];
rblapack_ncols = argv[2];
rblapack_ab = argv[3];
rblapack_afb = argv[4];
if (argc == 5) {
} else if (rblapack_options != Qnil) {
} else {
}
kl = NUM2INT(rblapack_kl);
ncols = NUM2INT(rblapack_ncols);
if (!NA_IsNArray(rblapack_afb))
rb_raise(rb_eArgError, "afb (5th argument) must be NArray");
if (NA_RANK(rblapack_afb) != 2)
rb_raise(rb_eArgError, "rank of afb (5th argument) must be %d", 2);
ldafb = NA_SHAPE0(rblapack_afb);
n = NA_SHAPE1(rblapack_afb);
if (NA_TYPE(rblapack_afb) != NA_SFLOAT)
rblapack_afb = na_change_type(rblapack_afb, NA_SFLOAT);
afb = NA_PTR_TYPE(rblapack_afb, real*);
ku = NUM2INT(rblapack_ku);
if (!NA_IsNArray(rblapack_ab))
rb_raise(rb_eArgError, "ab (4th argument) must be NArray");
if (NA_RANK(rblapack_ab) != 2)
rb_raise(rb_eArgError, "rank of ab (4th argument) must be %d", 2);
ldab = NA_SHAPE0(rblapack_ab);
if (NA_SHAPE1(rblapack_ab) != n)
rb_raise(rb_eRuntimeError, "shape 1 of ab must be the same as shape 1 of afb");
if (NA_TYPE(rblapack_ab) != NA_SFLOAT)
rblapack_ab = na_change_type(rblapack_ab, NA_SFLOAT);
ab = NA_PTR_TYPE(rblapack_ab, real*);
__out__ = sla_gbrpvgrw_(&n, &kl, &ku, &ncols, ab, &ldab, afb, &ldafb);
rblapack___out__ = rb_float_new((double)__out__);
return rblapack___out__;
#else
return Qnil;
#endif
}
void
init_lapack_sla_gbrpvgrw(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "sla_gbrpvgrw", rblapack_sla_gbrpvgrw, -1);
}
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