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#include "rb_lapack.h"
extern VOID dppcon_(char* uplo, integer* n, doublereal* ap, doublereal* anorm, doublereal* rcond, doublereal* work, integer* iwork, integer* info);
static VALUE
rblapack_dppcon(int argc, VALUE *argv, VALUE self){
VALUE rblapack_uplo;
char uplo;
VALUE rblapack_ap;
doublereal *ap;
VALUE rblapack_anorm;
doublereal anorm;
VALUE rblapack_rcond;
doublereal rcond;
VALUE rblapack_info;
integer info;
doublereal *work;
integer *iwork;
integer ldap;
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.dppcon( uplo, ap, anorm, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE DPPCON( UPLO, N, AP, ANORM, RCOND, WORK, IWORK, INFO )\n\n* Purpose\n* =======\n*\n* DPPCON estimates the reciprocal of the condition number (in the\n* 1-norm) of a real symmetric positive definite packed matrix using\n* the Cholesky factorization A = U**T*U or A = L*L**T computed by\n* DPPTRF.\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 triangle of A is stored;\n* = 'L': Lower triangle of A is stored.\n*\n* N (input) INTEGER\n* The order of the matrix A. N >= 0.\n*\n* AP (input) DOUBLE PRECISION array, dimension (N*(N+1)/2)\n* The triangular factor U or L from the Cholesky factorization\n* A = U**T*U or A = L*L**T, packed columnwise in a linear\n* array. The j-th column of U or L is stored in the array AP\n* as follows:\n* if UPLO = 'U', AP(i + (j-1)*j/2) = U(i,j) for 1<=i<=j;\n* if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.\n*\n* ANORM (input) DOUBLE PRECISION\n* The 1-norm (or infinity-norm) of the symmetric 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.dppcon( uplo, ap, anorm, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 3 && argc != 3)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 3)", argc);
rblapack_uplo = argv[0];
rblapack_ap = argv[1];
rblapack_anorm = argv[2];
if (argc == 3) {
} else if (rblapack_options != Qnil) {
} else {
}
uplo = StringValueCStr(rblapack_uplo)[0];
anorm = NUM2DBL(rblapack_anorm);
if (!NA_IsNArray(rblapack_ap))
rb_raise(rb_eArgError, "ap (2th argument) must be NArray");
if (NA_RANK(rblapack_ap) != 1)
rb_raise(rb_eArgError, "rank of ap (2th argument) must be %d", 1);
ldap = NA_SHAPE0(rblapack_ap);
if (NA_TYPE(rblapack_ap) != NA_DFLOAT)
rblapack_ap = na_change_type(rblapack_ap, NA_DFLOAT);
ap = NA_PTR_TYPE(rblapack_ap, doublereal*);
n = ((int)sqrtf(ldap*8+1.0f)-1)/2;
work = ALLOC_N(doublereal, (3*n));
iwork = ALLOC_N(integer, (n));
dppcon_(&uplo, &n, ap, &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_dppcon(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "dppcon", rblapack_dppcon, -1);
}
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