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#include "rb_lapack.h"
extern VOID dpbcon_(char* uplo, integer* n, integer* kd, doublereal* ab, integer* ldab, doublereal* anorm, doublereal* rcond, doublereal* work, integer* iwork, integer* info);
static VALUE
rblapack_dpbcon(int argc, VALUE *argv, VALUE self){
VALUE rblapack_uplo;
char uplo;
VALUE rblapack_kd;
integer kd;
VALUE rblapack_ab;
doublereal *ab;
VALUE rblapack_anorm;
doublereal anorm;
VALUE rblapack_rcond;
doublereal rcond;
VALUE rblapack_info;
integer info;
doublereal *work;
integer *iwork;
integer ldab;
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 rcond, info = NumRu::Lapack.dpbcon( uplo, kd, ab, anorm, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE DPBCON( UPLO, N, KD, AB, LDAB, ANORM, RCOND, WORK, IWORK, INFO )\n\n* Purpose\n* =======\n*\n* DPBCON estimates the reciprocal of the condition number (in the\n* 1-norm) of a real symmetric positive definite band matrix using the\n* Cholesky factorization A = U**T*U or A = L*L**T computed by DPBTRF.\n*\n* An estimate is obtained for norm(inv(A)), and the reciprocal of the\n* condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))).\n*\n\n* Arguments\n* =========\n*\n* UPLO (input) CHARACTER*1\n* = 'U': Upper triangular factor stored in AB;\n* = 'L': Lower triangular factor stored in AB.\n*\n* N (input) INTEGER\n* The order of the matrix A. N >= 0.\n*\n* KD (input) INTEGER\n* The number of superdiagonals of the matrix A if UPLO = 'U',\n* or the number of subdiagonals if UPLO = 'L'. KD >= 0.\n*\n* AB (input) DOUBLE PRECISION array, dimension (LDAB,N)\n* The triangular factor U or L from the Cholesky factorization\n* A = U**T*U or A = L*L**T of the band matrix A, stored in the\n* first KD+1 rows of the array. The j-th column of U or L is\n* stored in the j-th column of the array AB as follows:\n* if UPLO ='U', AB(kd+1+i-j,j) = U(i,j) for max(1,j-kd)<=i<=j;\n* if UPLO ='L', AB(1+i-j,j) = L(i,j) for j<=i<=min(n,j+kd).\n*\n* LDAB (input) INTEGER\n* The leading dimension of the array AB. LDAB >= KD+1.\n*\n* ANORM (input) DOUBLE PRECISION\n* The 1-norm (or infinity-norm) of the symmetric band matrix A.\n*\n* RCOND (output) DOUBLE PRECISION\n* The reciprocal of the condition number of the matrix A,\n* computed as RCOND = 1/(ANORM * AINVNM), where AINVNM is an\n* estimate of the 1-norm of inv(A) computed in this routine.\n*\n* WORK (workspace) DOUBLE PRECISION array, dimension (3*N)\n*\n* IWORK (workspace) INTEGER array, dimension (N)\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 rcond, info = NumRu::Lapack.dpbcon( uplo, kd, ab, anorm, [: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_uplo = argv[0];
rblapack_kd = argv[1];
rblapack_ab = argv[2];
rblapack_anorm = argv[3];
if (argc == 4) {
} else if (rblapack_options != Qnil) {
} else {
}
uplo = StringValueCStr(rblapack_uplo)[0];
if (!NA_IsNArray(rblapack_ab))
rb_raise(rb_eArgError, "ab (3th argument) must be NArray");
if (NA_RANK(rblapack_ab) != 2)
rb_raise(rb_eArgError, "rank of ab (3th argument) must be %d", 2);
ldab = NA_SHAPE0(rblapack_ab);
n = NA_SHAPE1(rblapack_ab);
if (NA_TYPE(rblapack_ab) != NA_DFLOAT)
rblapack_ab = na_change_type(rblapack_ab, NA_DFLOAT);
ab = NA_PTR_TYPE(rblapack_ab, doublereal*);
kd = NUM2INT(rblapack_kd);
anorm = NUM2DBL(rblapack_anorm);
work = ALLOC_N(doublereal, (3*n));
iwork = ALLOC_N(integer, (n));
dpbcon_(&uplo, &n, &kd, ab, &ldab, &anorm, &rcond, work, iwork, &info);
free(work);
free(iwork);
rblapack_rcond = rb_float_new((double)rcond);
rblapack_info = INT2NUM(info);
return rb_ary_new3(2, rblapack_rcond, rblapack_info);
}
void
init_lapack_dpbcon(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "dpbcon", rblapack_dpbcon, -1);
}
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